Integration tests against real server

Fix race error in bulk update integration test
Use driver class instead of datasource for Postgres (#3705 )
2023-09-22 20:41:48 +01:00 · 2023-08-05 10:49:57 +01:00 · 2023-08-05 10:28:01 +01:00 · 2023-08-05 10:09:30 +01:00 · 2023-08-05 09:49:56 +01:00 · 2023-06-25 22:36:31 +01:00
1020 changed files with 57773 additions and 23792 deletions
@@ -1 +1,2 @@
+github: lucko
 patreon: luckdev
@@ -0,0 +1,63 @@
+name: 🐛  Bug report
+description: Report an issue or problem with the way LuckPerms is functioning.
+labels: ["type: issue"]
+body:
+  - type: markdown
+    attributes:
+      value: "Before going any further, please check to see if your problem is fixed by updating to a newer version. The latest development builds can be obtained from https://luckperms.net/download"
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please provide a short description of the issue in the space below.
+      placeholder: Description goes here!
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: Reproduction Steps
+      description: Please provide a clear list of steps we should follow in order to reproduce your issue in the space below.
+      placeholder: List reproduction steps here, please!
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected Behaviour
+      description: Please provide a description of what you expected to happen.
+      placeholder: Describe what you expected to happen here.
+    validations:
+      required: true
+  - type: input
+    id: server-info
+    attributes:
+      label: Server Details
+      description: Please provide a description of the server details, including type and specific version number.
+      placeholder: 'git-Paper-124 (MC: 1.17.1)'
+    validations:
+      required: true
+  - type: input
+    id: luckperms-version
+    attributes:
+      label: LuckPerms Version
+      description: Please provide the specific, precise version number of LuckPerms you are using to reproduce this bug.
+      placeholder: v5.3.70
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs and Configs
+      description: If you think it would be helpful, please also include a pastebin of any relevant config files or log output. You should use https://gist.github.com/ to upload, then include the link below. 
+      placeholder: https://gist.github.com/HelpfulBugReporter/ThisIsAVeryUsefulLogOutput
+    validations:
+      required: false
+  - type: textarea
+    id: extra-info
+    attributes:
+      label: Extra Details
+      description: Please include any other relevant details in the space below.
+      placeholder: I was able to reproduce this only at the end of a rainbow.
+    validations:
+      required: false
@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 💬  Ask a question
+    url: https://discord.gg/luckperms
+    about: We use Discord to provide support for the project. If you have a question, need help, or aren't sure if you've found a bug or not, please come and talk to us there!
@@ -0,0 +1,31 @@
+name: 💡  Suggestion
+description: Suggest an idea for an improvement or change to LuckPerms.
+labels: ["type: suggestion"]
+body:
+  - type: markdown
+    attributes:
+      value: "Before going any further, please check to see if your suggestion has already been added by checking the [wiki](https://luckperms.net/wiki/Home). The latest development builds can be obtained from https://luckperms.net/download"
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Please provide a short description of your suggestion in the space below.
+      placeholder: Hello, perhaps you should...
+    validations:
+      required: true
+  - type: textarea
+    id: proposed-behaviour
+    attributes:
+      label: Proposed Behaviour
+      description: Please provide a short explanation of how the feature should work / be changed, and how this will affect the project.
+      placeholder: It would...
+    validations:
+      required: true
+  - type: textarea
+    id: extra-info
+    attributes:
+      label: Extra Details
+      description: Please include any other relevant details in the space below.
+      placeholder: I think this should only function at the end of a rainbow.
+    validations:
+      required: false
@@ -0,0 +1,127 @@
+name: Build Gradle and Publish Docker image
+
+on:
+  push:
+    branches:
+      - 'master'
+    tags:
+      - 'v*'
+  pull_request:
+    branches:
+      - 'master'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-gradle:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: validate gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+
+      - uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: Run build and tests with Gradle wrapper
+        run: ./gradlew test build -PdockerTests
+
+      - name: Publish test report
+        uses: mikepenz/action-junit-report@v3
+        if: success() || failure()
+        with:
+          report_paths: '**/build/test-results/test/TEST-*.xml'
+          annotate_notice: true
+          detailed_summary: true
+
+      - name: Upload all artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: jars
+          path: |
+            bukkit/loader/build/libs/LuckPerms-Bukkit-*.jar
+            bukkit-legacy/loader/build/libs/LuckPerms-Bukkit-Legacy-*.jar
+            bungee/loader/build/libs/LuckPerms-Bungee-*.jar
+            sponge/loader/build/libs/LuckPerms-Sponge-*.jar
+            nukkit/loader/build/libs/LuckPerms-Nukkit-*.jar
+            velocity/build/libs/LuckPerms-Velocity-*.jar
+            fabric/build/libs/LuckPerms-Fabric-*.jar
+            forge/loader/build/libs/LuckPerms-Forge-*.jar
+            standalone/loader/build/libs/LuckPerms-Standalone-*.jar
+
+      - name: Upload standalone artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: standalone-binary
+          path: standalone/loader/build/libs/LuckPerms-Standalone-*.jar
+
+
+  build-docker:
+    needs: build-gradle
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Retrieve saved standalone jar artifact
+        uses: actions/download-artifact@v3
+        with:
+          name: standalone-binary
+          path: standalone/docker/
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Determine the LuckPerms version
+        run: |
+          echo "luckperms_version=$(git describe --tags | awk -F "-" '{print $1 "." $2}')" >> "$GITHUB_ENV"
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          flavor: |
+            latest=${{ github.ref == 'refs/heads/master' }}
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=raw,enable=${{ github.ref == 'refs/heads/master' }},value=${{ env.luckperms_version }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: standalone/docker/
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
@@ -1,3 +1,6 @@
+### LuckPerms Standalone ###
+standalone/loader/data/
+
 ### Gradle & IntelliJ ###
 .gradle/
 /.idea/
@@ -1,6 +1,6 @@
 ### :speech_balloon: Looking for support?

-Details about support for the project can be found [here, on the Wiki Homepage](https://github.com/lucko/LuckPerms/wiki#support).
+Details about support for the project can be found [here, on the Wiki Homepage](https://luckperms.net/wiki/Home#support).

 ### :bug: Reporting bugs?

@@ -8,7 +8,7 @@ Before reporting a bug or issue, please make sure that the issue is actually bei

 If you're unsure, feel free to ask using the above resources BEFORE making a report.

-Bugs or issues should be reported using the [GitHub Issues tab](https://github.com/lucko/LuckPerms/issues).
+Bugs or issues should be reported using the [GitHub Issues tab](https://github.com/LuckPerms/LuckPerms/issues).

 ### :pencil: Want to contribute code?
 #### Pull Requests
@@ -16,11 +16,11 @@ If you make any changes or improvements to the plugin which you think would be b

 LuckPerms loosely follows the [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html). Generally, try to copy the style of code found in the class you're editing. 

-If you're considering submitting a substantial pull request, please open an issue so we can discuss the change before starting work on the contribution. Most pull requests are happily accepted, but larger changes may have an inpact on the maintainability of the project, and require more consideration. 
+If you're considering submitting a substantial pull request, please open an issue so we can discuss the change before starting work on the contribution. Most pull requests are happily accepted, but larger changes may have an impact on the maintainability of the project, and require more consideration. 

 #### Project Layout
-The project is split up into a few seperate modules.
+The project is split up into a few separate modules.

 * **API** - The public, semantically versioned API used by other plugins wishing to integrate with and retrieve data from LuckPerms. This module (for the most part) does not contain any implementation itself, and is provided by the plugin.
 * **Common** - The common module contains most of the code which implements the respective LuckPerms plugins. This abstract module reduces duplicated code throughout the project.
-* **Bukkit, BungeeCord, Sponge, Nukkit & Velocity** - Each use the common module to implement plugins on the respective server platforms.
+* **Bukkit, BungeeCord, Fabric, Forge, Nukkit, Sponge & Velocity** - Each use the common module to implement plugins on the respective server platforms.
@@ -1,37 +1,46 @@
-![alt text](https://i.imgur.com/ToguFkQ.png "Banner")
+![](https://raw.githubusercontent.com/LuckPerms/branding/master/banner/banner.png "Banner")
 # LuckPerms
 [![Build Status](https://ci.lucko.me/job/LuckPerms/badge/icon)](https://ci.lucko.me/job/LuckPerms/)
-[![Javadocs](https://javadoc.io/badge/me.lucko.luckperms/luckperms-api.svg)](https://javadoc.io/doc/me.lucko.luckperms/luckperms-api)
-[![Maven Central](https://img.shields.io/maven-metadata/v/https/repo1.maven.org/maven2/me/lucko/luckperms/luckperms-api/maven-metadata.xml.svg?label=maven%20central&colorB=brightgreen)](https://search.maven.org/artifact/me.lucko.luckperms/luckperms-api)
-[![Discord](https://img.shields.io/discord/241667244927483904.svg?logo=discord&label=)](https://discord.gg/luckperms)
+[![javadoc](https://javadoc.io/badge2/net.luckperms/api/javadoc.svg)](https://javadoc.io/doc/net.luckperms/api)
+[![Maven Central](https://img.shields.io/maven-metadata/v/https/repo1.maven.org/maven2/net/luckperms/api/maven-metadata.xml.svg?label=maven%20central&colorB=brightgreen)](https://search.maven.org/artifact/net.luckperms/api)
+[![Discord](https://img.shields.io/discord/241667244927483904.svg?label=discord&logo=discord)](https://discord.gg/luckperms)

-LuckPerms is an advanced permissions implementation aiming to be a fast, reliable and flexible alternative to existing permission plugins. The project's main goals are centered around high performance and a wide feature set, filling the gaps of functionality and building upon existing features found in other plugins.
+LuckPerms is a permissions plugin for Minecraft servers. It allows server admins to control what features players can use by creating groups and assigning permissions.

-LuckPerms also includes an extensive API for developers, and support for a variety of Minecraft server software & data storage options.
+The latest downloads, wiki & other useful links can be found on the project homepage at [luckperms.net](https://luckperms.net/).

-Still not convinced? More information can be found on the wiki, under: [Why LuckPerms?](https://github.com/lucko/LuckPerms/wiki/Why-LuckPerms)
+It is:

-## Useful Links
+* **fast** - written with performance and scalability in mind.
+* **reliable** - trusted by thousands of server admins, and the largest of server networks.
+* **easy to use** - setup permissions using commands, directly in config files, or using the web editor.
+* **flexible** - supports a variety of data storage options, and works on lots of different server types.
+* **extensive** - a plethora of customization options and settings which can be changed to suit your server.
+* **free** - available for download and usage at no cost, and permissively licensed so it can remain free forever.

-The latest **downloads** can be found on the [project's homepage](https://luckperms.net/).
-
-More information about the project & how to use the plugin can be found in the [wiki](https://github.com/lucko/LuckPerms/wiki).
+For more information, see the wiki article on [Why LuckPerms?](https://luckperms.net/wiki/Why-LuckPerms)

 ## Building
 LuckPerms uses Gradle to handle dependencies & building.

 #### Requirements
-* Java 8 JDK or newer
+* Java 17 JDK or newer
 * Git

 #### Compiling from source
 ```sh
-git clone https://github.com/lucko/LuckPerms.git
+git clone https://github.com/LuckPerms/LuckPerms.git
 cd LuckPerms/
 ./gradlew build
 ```

-You can find the output jars in the `build/libs` directories.
+You can find the output jars in the `loader/build/libs` or `build/libs` directories.
+
+## Tests
+There are some automated tests which run during each build.
+
+* Unit tests are defined in [`common/src/test`](https://github.com/LuckPerms/LuckPerms/tree/master/common/src/test)
+* Integration tests are defined in [`standalone/src/test`](https://github.com/LuckPerms/LuckPerms/tree/master/standalone/src/test).

 ## Contributing
 #### Pull Requests
@@ -44,7 +53,7 @@ The project is split up into a few separate modules.

 * **API** - The public, semantically versioned API used by other plugins wishing to integrate with and retrieve data from LuckPerms. This module (for the most part) does not contain any implementation itself, and is provided by the plugin.
 * **Common** - The common module contains most of the code which implements the respective LuckPerms plugins. This abstract module reduces duplicated code throughout the project.
-* **Bukkit, BungeeCord, Sponge, Nukkit & Velocity** - Each use the common module to implement plugins on the respective server platforms.
+* **Bukkit, BungeeCord, Fabric, Forge, Nukkit, Sponge & Velocity** - Each use the common module to implement plugins on the respective server platforms.

 ## License
-LuckPerms is licensed under the permissive MIT license. Please see [`LICENSE.txt`](https://github.com/lucko/LuckPerms/blob/master/LICENSE.txt) for more info.
+LuckPerms is licensed under the permissive MIT license. Please see [`LICENSE.txt`](https://github.com/LuckPerms/LuckPerms/blob/master/LICENSE.txt) for more info.
@@ -1,8 +1,15 @@
 group = 'net.luckperms'
-project.version = '5.0'
+project.version = '5.4'
+
+jar {
+    manifest {
+        attributes('Automatic-Module-Name': 'net.luckperms.api')
+    }
+}

 dependencies {
-    compileOnly 'org.checkerframework:checker-qual:2.5.5'
+    compileOnly 'org.checkerframework:checker-qual:3.21.2'
+    compileOnly 'org.jetbrains:annotations:23.1.0'
 }

 // Only used occasionally for deployment - not needed for normal builds.
@@ -12,12 +19,21 @@ if (project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePass

    javadoc {
        title = 'LuckPerms API (v' + project.ext.apiVersion + ')'
+        options.overview = 'javadoc/overview.html'
        options.encoding = 'UTF-8'
        options.charSet = 'UTF-8'
        options.links(
-                'https://docs.oracle.com/javase/8/docs/api/'
+                'https://checkerframework.org/api/',
+                'https://javadoc.io/static/org.jetbrains/annotations/23.0.0/'
        )
        options.addStringOption('Xdoclint:none', '-quiet')
+        options.addStringOption('-since', '5.0,5.1,5.2,5.3,5.4')
+
+        if (JavaVersion.current() > JavaVersion.VERSION_1_8) {
+            options.links.add('https://docs.oracle.com/en/java/javase/11/docs/api/')
+        } else {
+            options.links.add('https://docs.oracle.com/javase/8/docs/api/')
+        }
    }

    task javadocJar(type: Jar, dependsOn: javadoc) {
@@ -35,64 +51,69 @@ if (project.hasProperty('sonatypeUsername') && project.hasProperty('sonatypePass
        archives sourcesJar
    }

-    signing {
-        useGpgCmd()
-        sign configurations.archives
-    }
-
-    uploadArchives {
+    publishing {
        repositories {
-            mavenDeployer {
-                beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
+            maven {
+                def releasesRepoUrl = 'https://oss.sonatype.org/service/local/staging/deploy/maven2/'
+                def snapshotsRepoUrl = 'https://oss.sonatype.org/content/repositories/snapshots/'
+                url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl

-                repository(url: 'https://oss.sonatype.org/service/local/staging/deploy/maven2/') {
-                    authentication(userName: sonatypeUsername, password: sonatypePassword)
+                credentials {
+                    username sonatypeUsername
+                    password sonatypePassword
                }
+            }
+        }

-                snapshotRepository(url: 'https://oss.sonatype.org/content/repositories/snapshots/') {
-                    authentication(userName: sonatypeUsername, password: sonatypePassword)
-                }
+        publications {
+            mavenJava(MavenPublication) {
+                artifactId = 'api'
+
+                from components.java
+                artifact sourcesJar
+                artifact javadocJar

                pom {
-                    project {
-                        name 'LuckPerms API'
-                        description 'An advanced permissions plugin for Bukkit/Spigot, BungeeCord, Sponge, Nukkit and Velocity.'
-                        url 'https://luckperms.net'
+                    name = 'LuckPerms API'
+                    description = 'A permissions plugin for Minecraft servers.'
+                    url = 'https://luckperms.net'

-                        licenses {
-                            license {
-                                name 'MIT'
-                                url 'https://opensource.org/licenses/MIT'
-                            }
+                    licenses {
+                        license {
+                            name = 'MIT'
+                            url = 'https://opensource.org/licenses/MIT'
                        }
+                    }

-                        developers {
-                            developer {
-                                name 'Luck'
-                                email 'git@lucko.me'
-                                url 'https://github.com/lucko'
-                            }
+                    developers {
+                        developer {
+                            id = 'lucko'
+                            name = 'Luck'
+                            url = 'https://lucko.me'
+                            email = 'git@lucko.me'
                        }
+                    }

-                        scm {
-                            connection 'scm:git:https://github.com/lucko/LuckPerms.git'
-                            developerConnection 'scm:git:git@github.com:lucko/LuckPerms.git'
-                            url 'https://github.com/lucko/LuckPerms'
-                        }
+                    scm {
+                        connection = 'scm:git:https://github.com/LuckPerms/LuckPerms.git'
+                        developerConnection = 'scm:git:git@github.com:LuckPerms/LuckPerms.git'
+                        url = 'https://github.com/LuckPerms/LuckPerms'
+                    }

-                        ciManagement {
-                            system 'Jenkins'
-                            url 'https://ci.lucko.me/job/LuckPerms'
-                        }
-
-                        issueManagement {
-                            system 'GitHub'
-                            url 'https://github.com/lucko/LuckPerms/issues'
-                        }
+                    issueManagement {
+                        system = 'GitHub'
+                        url = 'https://github.com/LuckPerms/LuckPerms/issues'
                    }
                }
            }
        }
    }
+
+    signing {
+        useGpgCmd()
+        sign configurations.archives
+        sign publishing.publications.mavenJava
+        required = true
+    }
 }
 */
@@ -0,0 +1,20 @@
+<body>
+<p>
+    LuckPerms is a permissions plugin for Minecraft servers. It allows server admins to control what
+    features players can use by creating groups and assigning permissions.
+</p>
+<h4>Useful Links</h4>
+<ul>
+    <li><a target="_top" href="https://luckperms.net">Project Website</a></li>
+    <li><a target="_top" href="https://luckperms.net/wiki/Developer-API">Wiki - API Introduction</a></li>
+    <li><a target="_top" href="https://luckperms.net/wiki/Developer-API-Usage">Wiki - API Usage</a></li>
+    <li><a target="_top" href="https://github.com/LuckPerms/LuckPerms">Source Code</a></li>
+</ul>
+<h4>Maven</h4>
+<p>
+    The API artifact is deployed to Maven Central with
+    <a target="_top" href="https://search.maven.org/artifact/net.luckperms/api">
+        group id: <b><code>net.luckperms</code></b>, artifact id: <b><code>api</code></b>.
+    </a>
+</p>
+</body>
@@ -39,12 +39,15 @@ import net.luckperms.api.model.group.GroupManager;
 import net.luckperms.api.model.user.User;
 import net.luckperms.api.model.user.UserManager;
 import net.luckperms.api.node.NodeBuilderRegistry;
+import net.luckperms.api.node.matcher.NodeMatcherFactory;
 import net.luckperms.api.platform.Platform;
+import net.luckperms.api.platform.PlayerAdapter;
 import net.luckperms.api.platform.PluginMetadata;
+import net.luckperms.api.query.QueryOptionsRegistry;
 import net.luckperms.api.track.Track;
 import net.luckperms.api.track.TrackManager;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.Internal;

 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
@@ -114,6 +117,33 @@ public interface LuckPerms {
     */
    @NonNull TrackManager getTrackManager();

+    /**
+     * Gets the {@link PlayerAdapter} instance, a utility class for adapting platform Player
+     * instances to {@link User}s.
+     *
+     * <p>The {@code playerClass} parameter must be equal to the class or interface used by the
+     * server platform to represent players.</p>
+     *
+     * <p>Specifically:</p>
+     *
+     * <p></p>
+     * <ul>
+     * <li>{@code org.bukkit.entity.Player}</li>
+     * <li>{@code net.md_5.bungee.api.connection.ProxiedPlayer}</li>
+     * <li>{@code org.spongepowered.api/entity.living.player.Player}</li>
+     * <li>{@code net.minecraft.server.network.ServerPlayerEntity} (Fabric)</li>
+     * <li>{@code cn.nukkit.Player}</li>
+     * <li>{@code com.velocitypowered.api.proxy.Player}</li>
+     * </ul>
+     *
+     * @param playerClass the class used by the platform to represent players
+     * @param <T> the player class type
+     * @return the player adapter
+     * @throws IllegalArgumentException if the player class is not correct
+     * @since 5.1
+     */
+    <T> @NonNull PlayerAdapter<T> getPlayerAdapter(@NonNull Class<T> playerClass);
+
    /**
     * Gets the {@link Platform}, which represents the server platform the
     * plugin is running on.
@@ -165,13 +195,6 @@ public interface LuckPerms {
     */
    @NonNull ContextManager getContextManager();

-    /**
-     * Gets the {@link NodeBuilderRegistry}.
-     *
-     * @return the node builder registry
-     */
-    @NonNull NodeBuilderRegistry getNodeBuilderRegistry();
-
    /**
     * Gets the {@link MetaStackFactory}.
     *
@@ -206,4 +229,30 @@ public interface LuckPerms {
     */
    void registerMessengerProvider(@NonNull MessengerProvider messengerProvider);

+    /**
+     * Gets the {@link NodeBuilderRegistry}.
+     *
+     * @return the node builder registry
+     */
+    @Internal
+    @NonNull NodeBuilderRegistry getNodeBuilderRegistry();
+
+    /**
+     * Gets the {@link QueryOptionsRegistry}.
+     *
+     * @return the query options registry
+     * @since 5.1
+     */
+    @Internal
+    @NonNull QueryOptionsRegistry getQueryOptionsRegistry();
+
+    /**
+     * Gets the {@link NodeMatcherFactory}.
+     *
+     * @return the node matcher factory
+     * @since 5.1
+     */
+    @Internal
+    @NonNull NodeMatcherFactory getNodeMatcherFactory();
+
 }
@@ -27,41 +27,63 @@ package net.luckperms.api;

 import org.checkerframework.checker.nullness.qual.NonNull;

+import static org.jetbrains.annotations.ApiStatus.Internal;
+
 /**
- * Provides static access to the {@link LuckPerms} service.
+ * Provides static access to the {@link LuckPerms} API.
 *
 * <p>Ideally, the ServiceManager for the platform should be used to obtain an
- * instance, however, this provider can be used if you need static access.</p>
+ * instance, however, this provider can be used if this is not viable.</p>
 */
 public final class LuckPermsProvider {
    private static LuckPerms instance = null;

    /**
-     * Gets an instance of the {@link LuckPerms} service,
-     * throwing {@link IllegalStateException} if an instance is not yet loaded.
+     * Gets an instance of the {@link LuckPerms} API,
+     * throwing {@link IllegalStateException} if the API is not loaded yet.
     *
-     * <p>Will never return null.</p>
+     * <p>This method will never return null.</p>
     *
-     * @return an api instance
-     * @throws IllegalStateException if the api is not loaded
+     * @return an instance of the LuckPerms API
+     * @throws IllegalStateException if the API is not loaded yet
     */
    public static @NonNull LuckPerms get() {
+        LuckPerms instance = LuckPermsProvider.instance;
        if (instance == null) {
-            throw new IllegalStateException("The LuckPerms API is not loaded.");
+            throw new NotLoadedException();
        }
        return instance;
    }

+    @Internal
    static void register(LuckPerms instance) {
        LuckPermsProvider.instance = instance;
    }

+    @Internal
    static void unregister() {
        LuckPermsProvider.instance = null;
    }

+    @Internal
    private LuckPermsProvider() {
        throw new UnsupportedOperationException("This class cannot be instantiated.");
    }

+    /**
+     * Exception thrown when the API is requested before it has been loaded.
+     */
+    private static final class NotLoadedException extends IllegalStateException {
+        private static final String MESSAGE = "The LuckPerms API isn't loaded yet!\n" +
+                "This could be because:\n" +
+                "  a) the LuckPerms plugin is not installed or it failed to enable\n" +
+                "  b) the plugin in the stacktrace does not declare a dependency on LuckPerms\n" +
+                "  c) the plugin in the stacktrace is retrieving the API before the plugin 'enable' phase\n" +
+                "     (call the #get method in onEnable, not the constructor!)\n";
+
+        NotLoadedException() {
+            super(MESSAGE);
+        }
+    }
+
 }
@@ -26,7 +26,6 @@
 package net.luckperms.api.actionlog;

 import net.luckperms.api.LuckPermsProvider;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;

@@ -170,7 +169,7 @@ public interface Action extends Comparable<Action> {
         * @param type the type
         * @return the builder
         */
-        @NonNull Builder targetType(Action.Target.Type type);
+        @NonNull Builder targetType(Target.@NonNull Type type);

        /**
         * Sets the acted object for the entry.
@@ -26,6 +26,7 @@
 package net.luckperms.api.actionlog;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.SortedSet;
 import java.util.UUID;
@@ -47,7 +48,7 @@ public interface ActionLog {
     *
     * @return the content
     */
-    @NonNull SortedSet<Action> getContent();
+    @NonNull @Unmodifiable SortedSet<Action> getContent();

    /**
     * Gets the entries in the log performed by the given actor.
@@ -55,7 +56,7 @@ public interface ActionLog {
     * @param actor the uuid of the actor to filter by
     * @return the content for the given actor
     */
-    @NonNull SortedSet<Action> getContent(@NonNull UUID actor);
+    @NonNull @Unmodifiable SortedSet<Action> getContent(@NonNull UUID actor);

    /**
     * Gets the log content for a given user
@@ -63,7 +64,7 @@ public interface ActionLog {
     * @param uniqueId the uuid to filter by
     * @return all content in this log where the user = uuid
     */
-    @NonNull SortedSet<Action> getUserHistory(@NonNull UUID uniqueId);
+    @NonNull @Unmodifiable SortedSet<Action> getUserHistory(@NonNull UUID uniqueId);

    /**
     * Gets the log content for a given group
@@ -71,7 +72,7 @@ public interface ActionLog {
     * @param name the name to filter by
     * @return all content in this log where the group = name
     */
-    @NonNull SortedSet<Action> getGroupHistory(@NonNull String name);
+    @NonNull @Unmodifiable SortedSet<Action> getGroupHistory(@NonNull String name);

    /**
     * Gets the log content for a given track
@@ -79,6 +80,6 @@ public interface ActionLog {
     * @param name the name to filter by
     * @return all content in this log where the track = name
     */
-    @NonNull SortedSet<Action> getTrackHistory(@NonNull String name);
+    @NonNull @Unmodifiable SortedSet<Action> getTrackHistory(@NonNull String name);

 }
@@ -26,7 +26,6 @@
 package net.luckperms.api.actionlog;

 import net.luckperms.api.messaging.MessagingService;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.concurrent.CompletableFuture;
@@ -23,15 +23,7 @@
 *  SOFTWARE.
 */

-package me.lucko.luckperms.common.dependencies.classloader;
-
-import java.nio.file.Path;
-
 /**
- * Represents the plugins classloader
+ * {@link net.luckperms.api.actionlog.ActionLog} related functionality.
 */
-public interface PluginClassLoader {
-
-    void loadJar(Path file);
-
-}
+package net.luckperms.api.actionlog;
@@ -26,11 +26,14 @@
 package net.luckperms.api.cacheddata;

 import net.luckperms.api.query.QueryOptions;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
 * Holds cached lookup data for a given set of query options.
+ *
+ * <p>All calls will account for inheritance, as well as any default data
+ * provided by the platform. These calls are heavily cached and are therefore
+ * fast.</p>
 */
 public interface CachedData {

@@ -25,9 +25,11 @@

 package net.luckperms.api.cacheddata;

+import net.luckperms.api.context.ContextManager;
 import net.luckperms.api.model.PermissionHolder;
+import net.luckperms.api.model.group.Group;
+import net.luckperms.api.model.user.User;
 import net.luckperms.api.query.QueryOptions;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.concurrent.CompletableFuture;
@@ -36,7 +38,7 @@ import java.util.concurrent.CompletableFuture;
 * Holds cached permission and meta lookup data for a {@link PermissionHolder}.
 *
 * <p>All calls will account for inheritance, as well as any default data
- * provided by the platform. This calls are heavily cached and are therefore
+ * provided by the platform. These calls are heavily cached and are therefore
 * fast.</p>
 */
 public interface CachedDataManager {
@@ -56,23 +58,56 @@ public interface CachedDataManager {
    @NonNull Container<CachedMetaData> metaData();

    /**
-     * Gets PermissionData from the cache, given a specified context.
+     * Gets PermissionData from the cache, using the given query options.
     *
     * @param queryOptions the query options
     * @return a permission data instance
-     * @throws NullPointerException if contexts is null
     */
    @NonNull CachedPermissionData getPermissionData(@NonNull QueryOptions queryOptions);

    /**
-     * Gets MetaData from the cache, given a specified context.
+     * Gets MetaData from the cache, using the given query options.
     *
     * @param queryOptions the query options
     * @return a meta data instance
-     * @throws NullPointerException if contexts is null
     */
    @NonNull CachedMetaData getMetaData(@NonNull QueryOptions queryOptions);

+    /**
+     * Gets PermissionData from the cache, using the most appropriate query options
+     * available at the time.
+     *
+     * <p>For {@link User}s, the most appropriate query options will be their
+     * {@link ContextManager#getQueryOptions(User) current active query options} if the
+     * corresponding player is online, and otherwise, will fallback to
+     * {@link ContextManager#getStaticQueryOptions() the current static query options}.</p>
+     *
+     * <p>For {@link Group}s, the most appropriate query options will always be
+     * {@link ContextManager#getStaticQueryOptions() the current static query options}.</p>
+     *
+     * @return a permission data instance
+     * @since 5.1
+     */
+    @NonNull CachedPermissionData getPermissionData();
+
+    /**
+     * Gets MetaData from the cache, using the most appropriate query options
+     * available at the time.
+     *
+     * <p>For {@link User}s, the most appropriate query options will be their
+     * {@link ContextManager#getQueryOptions(User) current active query options} if the
+     * corresponding player is online, and otherwise, will fallback to
+     * {@link ContextManager#getStaticQueryOptions() the current static query options}.</p>
+     *
+     * <p>For {@link Group}s, the most appropriate query options will always be
+     * {@link ContextManager#getStaticQueryOptions() the current static query options}.</p>
+     *
+     * @return a meta data instance
+     * @since 5.1
+     * @see PermissionHolder#getQueryOptions()
+     */
+    @NonNull CachedMetaData getMetaData();
+
    /**
     * Invalidates all cached {@link CachedPermissionData} and {@link CachedMetaData}
     * instances.
@@ -80,7 +115,7 @@ public interface CachedDataManager {
    void invalidate();

    /**
-     * Invalidates all of the underlying Permission calculators.
+     * Invalidates all underlying permission calculators.
     *
     * <p>Can be called to allow for an update in defaults.</p>
     */
@@ -26,73 +26,227 @@
 package net.luckperms.api.cacheddata;

 import net.luckperms.api.metastacking.MetaStackDefinition;
-
+import net.luckperms.api.node.types.MetaNode;
+import net.luckperms.api.node.types.PrefixNode;
+import net.luckperms.api.node.types.SuffixNode;
+import net.luckperms.api.node.types.WeightNode;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.SortedMap;
+import java.util.function.Function;

 /**
 * Holds cached meta lookup data for a specific set of contexts.
+ * 
+ * <p>Meta data refers to {@link PrefixNode prefixes}, {@link SuffixNode suffixes} and
+ * {@link MetaNode meta (options)} held by a permission holder.</p>
+ *
+ * <p>All calls will account for inheritance, as well as any default data
+ * provided by the platform. These calls are heavily cached and are therefore
+ * fast.</p>
 */
 public interface CachedMetaData extends CachedData {

+    /**
+     * Query a meta value for the given {@code key}.
+     * 
+     * <p>This method will always return a {@link Result}, but the
+     * {@link Result#result() inner result} {@link String} will be null if a value
+     * for the given key was not found.</p>
+     *
+     * @param key the key
+     * @return a result containing the value
+     * @since 5.4
+     */
+    @NonNull Result<String, MetaNode> queryMetaValue(@NonNull String key);
+
    /**
     * Gets a value for the given meta key.
+     * 
+     * <p>If no such meta value exists for the given key, {@code null} is returned.</p>
     *
     * @param key the key
     * @return the value
     */
-    @Nullable String getMetaValue(String key);
+    default @Nullable String getMetaValue(@NonNull String key) {
+        return queryMetaValue(key).result();
+    }

    /**
-     * Gets the user's highest priority prefix, or null if the user has no prefixes
+     * Gets a value for the given meta key, and runs it through the given {@code transformer}.
+     *
+     * <p>If no such meta value exists, an {@link Optional#empty() empty optional} is returned.
+     * (the transformer will never be passed a null argument)</p>
+     *
+     * <p>The transformer is allowed to throw {@link IllegalArgumentException} or return null. This
+     * will also result in an {@link Optional#empty() empty optional} being returned.</p>
+     *
+     * <p>For example, to parse and return an integer meta value, use:</p>
+     * <p><blockquote><pre>
+     *     getMetaValue("my-int-val", Integer::parseInt).orElse(0);
+     * </pre></blockquote>
+     *
+     * @param key the key
+     * @param valueTransformer the transformer used to transform the value
+     * @param <T> the type of the transformed result
+     * @return the meta value
+     * @since 5.3
+     */
+    default <T> @NonNull Optional<T> getMetaValue(@NonNull String key, @NonNull Function<String, ? extends T> valueTransformer) {
+        return Optional.ofNullable(getMetaValue(key)).map(value -> {
+            try {
+                return valueTransformer.apply(value);
+            } catch (IllegalArgumentException e) {
+                return null;
+            }
+        });
+    }
+
+    /**
+     * Query for a prefix.
+     * 
+     * <p>This method uses the rules defined by the {@link #getPrefixStackDefinition() prefix stack}
+     * to produce a {@link String} output.</p>
+     * 
+     * <p>Assuming the default configuration is used, this will usually be the value of the
+     * holder's highest priority prefix node.</p>
+     * 
+     * <p>This method will always return a {@link Result}, but the
+     * {@link Result#result() inner result} {@link String} will be null if
+     * a the resultant prefix stack contained no elements.</p>
+     *
+     * @return a result containing the prefix
+     * @since 5.4
+     */
+    @NonNull Result<String, PrefixNode> queryPrefix();
+
+    /**
+     * Gets the prefix.
+     * 
+     * <p>This method uses the rules defined by the {@link #getPrefixStackDefinition() prefix stack}
+     * to produce a {@link String} output.</p>
+     * 
+     * <p>Assuming the default configuration is used, this will usually be the value of the
+     * holder's highest priority prefix node.</p>
+     * 
+     * <p>If the resultant prefix stack contained no elements, {@code null} is returned.</p>
     *
     * @return a prefix string, or null
     */
-    @Nullable String getPrefix();
+    default @Nullable String getPrefix() {
+        return queryPrefix().result();
+    }

    /**
-     * Gets the user's highest priority suffix, or null if the user has no suffixes
+     * Query for a suffix.
+     *
+     * <p>This method uses the rules defined by the {@link #getSuffixStackDefinition() suffix stack}
+     * to produce a {@link String} output.</p>
+     *
+     * <p>Assuming the default configuration is used, this will usually be the value of the
+     * holder's highest priority suffix node.</p>
+     *
+     * <p>This method will always return a {@link Result}, but the
+     * {@link Result#result() inner result} {@link String} will be null if
+     * a the resultant suffix stack contained no elements.</p>
+     *
+     * @return a result containing the suffix
+     * @since 5.4
+     */
+    @NonNull Result<String, SuffixNode> querySuffix();
+
+    /**
+     * Gets the suffix.
+     *
+     * <p>This method uses the rules defined by the {@link #getSuffixStackDefinition() suffix stack}
+     * to produce a {@link String} output.</p>
+     *
+     * <p>Assuming the default configuration is used, this will usually be the value of the
+     * holder's highest priority suffix node.</p>
+     *
+     * <p>If the resultant suffix stack contained no elements, {@code null} is returned.</p>
     *
     * @return a suffix string, or null
     */
-    @Nullable String getSuffix();
+    default @Nullable String getSuffix() {
+        return querySuffix().result();
+    }

    /**
-     * Gets an immutable copy of the meta this user has.
+     * Query for a weight.
     *
-     * @return an immutable map of meta
+     * <p>This method will always return a {@link Result}, and the
+     * {@link Result#result() inner result} {@link Integer} will never be null.
+     * A value of {@code 0} is equivalent to null.</p>
+     *
+     * @return a result containing the weight
+     * @since 5.5
     */
-    @NonNull Map<String, List<String>> getMeta();
+    @NonNull Result<Integer, WeightNode> queryWeight();

    /**
-     * Gets an immutable sorted map of all of the prefixes the user has, whereby the first value is the highest priority
-     * prefix.
+     * Gets the weight.
+     *
+     * <p>If the there is no defined weight, {@code 0} is returned.</p>
+     *
+     * @return the weight
+     * @since 5.5
+     */
+    default int getWeight() {
+        return queryWeight().result();
+    }
+
+    /**
+     * Gets a map of all accumulated {@link MetaNode meta}.
+     *
+     * <p>Prefer using the {@link #getMetaValue(String)} method for querying values.</p>
+     *
+     * @return a map of meta
+     */
+    @NonNull @Unmodifiable Map<String, List<String>> getMeta();
+
+    /**
+     * Gets a sorted map of all accumulated {@link PrefixNode prefixes}.
+     *
+     * <p>Prefer using the {@link #getPrefix()} method for querying.</p>
     *
     * @return a sorted map of prefixes
     */
-    @NonNull SortedMap<Integer, String> getPrefixes();
+    @NonNull @Unmodifiable SortedMap<Integer, String> getPrefixes();

    /**
-     * Gets an immutable sorted map of all of the suffixes the user has, whereby the first value is the highest priority
-     * suffix.
+     * Gets a sorted map of all accumulated {@link SuffixNode suffixes}.
+     *
+     * <p>Prefer using the {@link #getSuffix()} method for querying.</p>
     *
     * @return a sorted map of suffixes
     */
-    @NonNull SortedMap<Integer, String> getSuffixes();
+    @NonNull @Unmodifiable SortedMap<Integer, String> getSuffixes();

    /**
-     * Gets the definition used for the prefix stack
+     * Gets the name of the holders primary group.
+     *
+     * <p>Will return {@code null} for Group holder types.</p>
+     *
+     * @return the name of the primary group
+     * @since 5.1
+     */
+    @Nullable String getPrimaryGroup();
+
+    /**
+     * Gets the definition used for the prefix stack.
     *
     * @return the definition used for the prefix stack
     */
    @NonNull MetaStackDefinition getPrefixStackDefinition();

    /**
-     * Gets the definition used for the suffix stack
+     * Gets the definition used for the suffix stack.
     *
     * @return the definition used for the suffix stack
     */
@@ -25,25 +25,48 @@

 package net.luckperms.api.cacheddata;

+import net.luckperms.api.node.Node;
 import net.luckperms.api.util.Tristate;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.Map;

 /**
 * Holds cached permission lookup data for a specific set of contexts.
+ *
+ * <p>All calls will account for inheritance, as well as any default data
+ * provided by the platform. These calls are heavily cached and are therefore
+ * fast.</p>
 */
 public interface CachedPermissionData extends CachedData {

    /**
-     * Gets a permission check result for the given permission node.
+     * Performs a permission check for the given {@code permission} node.
+     *
+     * <p>This check is equivalent to the "hasPermission" method call on most platforms.
+     * You can use {@link Tristate#asBoolean()} if you need a truthy result.</p>
+     *
+     * @param permission the permission node
+     * @return a result containing the tristate
+     * @throws NullPointerException if permission is null
+     * @since 5.4
+     */
+    @NonNull Result<Tristate, Node> queryPermission(@NonNull String permission);
+
+    /**
+     * Performs a permission check for the given {@code permission} node.
+     *
+     * <p>This check is equivalent to the "hasPermission" method call on most platforms.
+     * You can use {@link Tristate#asBoolean()} if you need a truthy result.</p>
     *
     * @param permission the permission node
     * @return a tristate result
     * @throws NullPointerException if permission is null
     */
-    @NonNull Tristate checkPermission(@NonNull String permission);
+    default @NonNull Tristate checkPermission(@NonNull String permission) {
+        return queryPermission(permission).result();
+    }

    /**
     * Invalidates the underlying permission calculator cache.
@@ -57,6 +80,6 @@ public interface CachedPermissionData extends CachedData {
     *
     * @return an immutable set of permissions
     */
-    @NonNull Map<String, Boolean> getPermissionMap();
+    @NonNull @Unmodifiable Map<String, Boolean> getPermissionMap();

 }
@@ -0,0 +1,81 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.cacheddata;
+
+import net.luckperms.api.node.Node;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Represents the result of a cached data lookup.
+ *
+ * <p>You can find "the holder that has the node that caused this result"
+ * using the following code:</p>
+ * <p></p>
+ * <blockquote>
+ * <pre>
+ * public static {@link net.luckperms.api.model.PermissionHolder.Identifier} holderThatHasTheNodeThatCausedTheResult(Result&lt;?, ?&gt; result) {
+ *     {@link Node} node = result.node();
+ *     if (node == null) {
+ *         return null;
+ *     }
+ *     {@link net.luckperms.api.node.metadata.types.InheritanceOriginMetadata} origin = node.getMetadata(InheritanceOriginMetadata.KEY).orElse(null);
+ *     if (origin == null) {
+ *         return null;
+ *     }
+ *     return origin.getOrigin();
+ * }
+ * </pre>
+ *
+ * <p>Combined with the node itself, this is all the information needed to determine
+ * the root cause of the result.</p>
+ * </blockquote>
+ *
+ * <p>The nullability of {@link #result()} is purposely undefined to allow the
+ * flexibility for methods using {@link Result} to declare it. In general, if the {@code T} type
+ * has a nullable/undefined value, then the return of {@link #result()} will be non-null,
+ * and if not, it will be nullable.</p>
+ *
+ * @param <T> the result type
+ * @param <N> the node type
+ * @since 5.4
+ */
+public interface Result<T, N extends Node> {
+
+    /**
+     * Gets the underlying result.
+     *
+     * @return the underlying result
+     */
+    T result();
+
+    /**
+     * Gets the node that caused the result.
+     *
+     * @return the causing node
+     */
+    @Nullable N node();
+
+}
@@ -0,0 +1,30 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Caches permission checks and meta lookups for {@link net.luckperms.api.model.user.User}s and
+ * {@link net.luckperms.api.model.group.Group}s.
+ */
+package net.luckperms.api.cacheddata;
@@ -26,12 +26,64 @@
 package net.luckperms.api.context;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;

 /**
 * Represents an individual context pair.
+ *
+ * <p>Context keys and values may not be null or empty. A key/value will be
+ * deemed empty if it's length is zero, or if it consists of only space
+ * characters.</p>
+ *
+ * @see ContextSet
 */
 public interface Context {

+    /**
+     * Tests whether {@code key} is valid.
+     *
+     * <p>Context keys and values may not be null or empty. A key/value will be
+     * deemed empty if it's length is zero, or if it consists of only space
+     * characters.</p>
+     *
+     * <p>An exception is thrown when an invalid key is added to a {@link ContextSet}.</p>
+     *
+     * @param key the key to test
+     * @return true if valid, false otherwise.
+     * @since 5.1
+     */
+    static boolean isValidKey(@Nullable String key) {
+        if (key == null || key.isEmpty()) {
+            return false;
+        }
+
+        // look for a non-whitespace character
+        for (int i = 0, n = key.length(); i < n; i++) {
+            if (key.charAt(i) != ' ') {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Tests whether {@code value} is valid.
+     *
+     * <p>Context keys and values may not be null or empty. A key/value will be
+     * deemed empty if it's length is zero, or if it consists of only space
+     * characters.</p>
+     *
+     * <p>An exception is thrown when an invalid value is added to a {@link ContextSet}.</p>
+     *
+     * @param value the value to test
+     * @return true if valid, false otherwise.
+     * @since 5.1
+     */
+    static boolean isValidValue(@Nullable String value) {
+        return isValidKey(value); // the same for now...
+    }
+
    /**
     * Gets the context key.
     *
@@ -103,7 +103,7 @@ public interface ContextCalculator<T> {
     *
     * @return a set of potential contexts
     */
-    default ContextSet estimatePotentialContexts() {
+    default @NonNull ContextSet estimatePotentialContexts() {
        return ImmutableContextSet.empty();
    }

@@ -28,8 +28,8 @@ package net.luckperms.api.context;
 import net.luckperms.api.model.user.User;
 import net.luckperms.api.query.QueryMode;
 import net.luckperms.api.query.QueryOptions;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.Internal;

 import java.util.Optional;

@@ -37,17 +37,18 @@ import java.util.Optional;
 * Manages {@link ContextCalculator}s, and calculates applicable contexts for a
 * given type.
 *
- * This interface accepts {@link Object} types as a parameter to avoid having to depend
+ * <p>This interface accepts {@link Object} types as a parameter to avoid having to depend
 * on specific server implementations. In all cases, the "player" or "subject" type for
- * the platform must be used.
+ * the platform must be used.</p>
 *
- * Specifically:
+ * <p>Specifically:</p>
 *
 * <p></p>
 * <ul>
 * <li>{@code org.bukkit.entity.Player}</li>
 * <li>{@code net.md_5.bungee.api.connection.ProxiedPlayer}</li>
 * <li>{@code org.spongepowered.api.service.permission.Subject}</li>
+ * <li>{@code net.minecraft.server.network.ServerPlayerEntity} (Fabric)</li>
 * <li>{@code cn.nukkit.Player}</li>
 * <li>{@code com.velocitypowered.api.proxy.Player}</li>
 * </ul>
@@ -138,19 +139,36 @@ public interface ContextManager {
     */
    void unregisterCalculator(@NonNull ContextCalculator<?> calculator);

+    /**
+     * Signal to the {@link ContextManager} that a {@code subject}s
+     * current contexts have changed.
+     *
+     * <p>It is not strictly necessary to make a call to this method every time a context
+     * changes.</p>
+     *
+     * @param subject the subject
+     * @since 5.2
+     */
+    void signalContextUpdate(@NonNull Object subject);
+
    /**
     * Gets the {@link ContextSetFactory}, responsible for creating
     * {@link ContextSet} instances.
     *
     * @return the context set factory
     */
+    @Internal
    @NonNull ContextSetFactory getContextSetFactory();

    /**
     * Invalidates the lookup cache for a given subject
     *
     * @param subject the subject
+     * @deprecated Use {@link #signalContextUpdate(Object)} instead
     */
-    void invalidateCache(@NonNull Object subject);
+    @Deprecated
+    default void invalidateCache(@NonNull Object subject) {
+        signalContextUpdate(subject);
+    }

 }
@@ -0,0 +1,63 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.context;
+
+import net.luckperms.api.query.OptionKey;
+
+/**
+ * Mode for determining whether a {@link ContextSet} satisfies another.
+ *
+ * @since 5.2
+ * @see ContextSet#isSatisfiedBy(ContextSet, ContextSatisfyMode)
+ */
+public enum ContextSatisfyMode {
+
+    /**
+     * Mode where a {@link ContextSet} A will be satisfied by another set B, if at least one of the
+     * key-value entries per key in A are also in B.
+     *
+     * <p>For example, given <code>A = {server=survival, world=overworld, world=nether}</code>,
+     * another set {@code X} will satisfy {@code A} if {@code X} contains
+     * <code>server=survival AND (world=overworld OR world=nether)</code>.</p>
+     */
+    AT_LEAST_ONE_VALUE_PER_KEY,
+
+    /**
+     * Mode where a {@link ContextSet} A will be satisfied by another set B, if all key-value
+     * entries in A are also in B.
+     *
+     * <p>For example, given <code>A = {server=survival, world=overworld, world=nether}</code>,
+     * another set {@code X} will satisfy {@code A} if {@code X} contains
+     * <code>server=survival AND world=overworld AND world=nether</code>.</p>
+     */
+    ALL_VALUES_PER_KEY;
+
+    /**
+     * The {@link OptionKey} for {@link ContextSatisfyMode}.
+     */
+    public static final OptionKey<ContextSatisfyMode> KEY = OptionKey.of("contextsatisfymode", ContextSatisfyMode.class);
+
+}
@@ -26,6 +26,7 @@
 package net.luckperms.api.context;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.Iterator;
 import java.util.Map;
@@ -40,19 +41,33 @@ import java.util.Set;
 * something will apply.</p>
 *
 * <p>A single "context" consists of a key and a value, both strings. The key
- * represents the type of context, and the value represents the setting of the
- * context key.</p>
+ * describes the type of the context, and the value represents what the key is
+ * set to.</p>
+ *
+ * <p>For example, a context with {@code key=world} and {@code value=world_nether}
+ * describes that a subject is in the "world_nether" world.</p>
+ *
+ * <p>Contexts are exposed to end users and manipulated when managing permissions.
+ * For this reason, context keys should strike a balance between being descriptive
+ * and succinct.</p>
+ *
+ * <p>Context keys and values are case-insensitive, and will be automatically
+ * converted to {@link String#toLowerCase() lowercase} when added to a
+ * context set. Keys and values cannot be null or empty (len=0 or consisting of
+ * only whitespace).</p>
+ *
+ * <p>If a context key is formed of more than one word, the parts should be
+ * separated by the '{@code -}' character. (e.g. "{@code server-type}")</p>
+ *
+ * <p>If a context key is likely to conflict with another plugin, it should be
+ * appropriately namespaced using the name of the plugin providing the context.
+ * The namespace should be at the start of the context key, and separated using
+ * the '{@code :}' character. (e.g. "{@code worldguard:region}" for WorldGuard
+ * regions)</p>
 *
 * <p>Contexts can be combined with each other to form so called
 * "context sets" - simply a collection of context pairs.</p>
 *
- * <p>Context keys and values are case-insensitive, and will be converted to
- * {@link String#toLowerCase() lowercase} by all implementations.</p>
- *
- * <p>Context keys and values may not be null or empty. A key/value will be
- * deemed empty if it's length is zero, or if it consists of only space
- * characters.</p>
- *
 * <p>Two default ContextSet implementations are provided.
 * {@link MutableContextSet} allows the addition and removal of context keys
 * after construction, and {@link ImmutableContextSet} does not.</p>
@@ -97,7 +112,7 @@ public interface ContextSet extends Iterable<Context> {
     *
     * @return an immutable set
     */
-    @NonNull Set<Context> toSet();
+    @NonNull @Unmodifiable Set<Context> toSet();

    /**
     * Returns a {@link Map} representing the current state of this
@@ -108,7 +123,7 @@ public interface ContextSet extends Iterable<Context> {
     *
     * @return a map
     */
-    @NonNull Map<String, Set<String>> toMap();
+    @NonNull @Unmodifiable Map<String, Set<String>> toMap();

    /**
     * Returns a {@link Map} <b>loosely</b> representing the current state of
@@ -121,10 +136,10 @@ public interface ContextSet extends Iterable<Context> {
     * may not be a true representation of the set.</p>
     *
     * @return an immutable map
-     * @deprecated because the resultant map may not contain all data in the ContextSet
+     * @deprecated Deprecated because the returned map may not contain all data in the ContextSet
     */
    @Deprecated
-    @NonNull Map<String, String> toFlattenedMap();
+    @NonNull @Unmodifiable Map<String, String> toFlattenedMap();

    /**
     * Returns an {@link Iterator} over each of the context pairs in this set.
@@ -137,7 +152,7 @@ public interface ContextSet extends Iterable<Context> {
     * @return an iterator
     */
    @Override
-    @NonNull Iterator<Context> iterator();
+    @NonNull @Unmodifiable Iterator<Context> iterator();

    /**
     * Returns if the {@link ContextSet} contains at least one value for the
@@ -159,7 +174,7 @@ public interface ContextSet extends Iterable<Context> {
     * @return a set of values
     * @throws NullPointerException if the key is null
     */
-    @NonNull Set<String> getValues(@NonNull String key);
+    @NonNull @Unmodifiable Set<String> getValues(@NonNull String key);

    /**
     * Returns any value from this {@link ContextSet} matching the key, if present.
@@ -197,17 +212,47 @@ public interface ContextSet extends Iterable<Context> {
    }

    /**
-     * Returns if this {@link ContextSet} is fully "satisfied" by another set.
+     * Returns if the {@link ContextSet} contains any of the given context pairings.
     *
-     * <p>For a context set to "satisfy" another, it must itself contain all of
-     * the context pairings in the other set.</p>
-     *
-     * <p>Mathematically, this method returns true if this set is a <b>subset</b> of the other.</p>
-     *
-     * @param other the other set to check
-     * @return true if all entries in this set are also in the other set
+     * @param key the key to look for
+     * @param values the values to look for
+     * @return true if the set contains any of the pairs
+     * @since 5.2
     */
-    boolean isSatisfiedBy(@NonNull ContextSet other);
+    default boolean containsAny(@NonNull String key, @NonNull Iterable<String> values) {
+        Objects.requireNonNull(key, "key");
+        Objects.requireNonNull(values, "values");
+
+        for (String value : values) {
+            if (contains(key, value)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns if this {@link ContextSet} is "satisfied" by another set.
+     *
+     * <p>{@link ContextSatisfyMode#AT_LEAST_ONE_VALUE_PER_KEY} is the mode used by this method.</p>
+     *
+     * @param other the other set
+     * @return true if this context set is satisfied by the other
+     */
+    default boolean isSatisfiedBy(@NonNull ContextSet other) {
+        return isSatisfiedBy(other, ContextSatisfyMode.AT_LEAST_ONE_VALUE_PER_KEY);
+    }
+
+    /**
+     * Returns if this {@link ContextSet} is "satisfied" by another set, according to the given
+     * {@code mode}.
+     *
+     * @param other the other set
+     * @param mode the mode to use
+     * @return true if this context set is satisfied by the other
+     * @since 5.2
+     */
+    boolean isSatisfiedBy(@NonNull ContextSet other, @NonNull ContextSatisfyMode mode);

    /**
     * Returns if the {@link ContextSet} is empty.
@@ -26,18 +26,49 @@
 package net.luckperms.api.context;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.Internal;

 /**
 * A factory for creating {@link ContextSet}s.
+ *
+ * <p>Prefer using the static methods on {@link ImmutableContextSet} or {@link MutableContextSet}
+ * instead of this interface.</p>
 */
+@Internal
 public interface ContextSetFactory {

+    /**
+     * Prefer using {@link ImmutableContextSet#builder()}.
+     *
+     * @return a immutable context set builder
+     * @see ImmutableContextSet#builder()
+     */
    ImmutableContextSet.@NonNull Builder immutableBuilder();

+    /**
+     * Prefer using {@link ImmutableContextSet#of(String, String)}.
+     *
+     * @param key the key
+     * @param value the value
+     * @return an immutable context set
+     * @see ImmutableContextSet#of(String, String)
+     */
    @NonNull ImmutableContextSet immutableOf(@NonNull String key, @NonNull String value);

+    /**
+     * Prefer using {@link ImmutableContextSet#empty()}.
+     *
+     * @return an empty immutable context set
+     * @see ImmutableContextSet#empty()
+     */
    @NonNull ImmutableContextSet immutableEmpty();

+    /**
+     * Prefer using {@link MutableContextSet#create()}.
+     *
+     * @return a new mutable context set
+     * @see MutableContextSet#create()
+     */
    @NonNull MutableContextSet mutable();

 }
@@ -34,13 +34,31 @@ public final class DefaultContextKeys {
    }

    /**
-     * The context key used to denote the subjects server.
+     * The context key used to denote the name of the subjects server.
     */
    public static final String SERVER_KEY = "server";

    /**
-     * The context key used to denote the subjects world.
+     * The context key used to denote the name of the subjects world.
     */
    public static final String WORLD_KEY = "world";

+    /**
+     * The context key used to denote the dimension type of the subjects world.
+     *
+     * <p>Possible values: overworld, the_nether, the_end</p>
+     *
+     * @since 5.3
+     */
+    public static final String DIMENSION_TYPE_KEY = "dimension-type";
+
+    /**
+     * The context key used to denote the subjects gamemode.
+     *
+     * <p>Possible values: survival, creative, adventure, spectator</p>
+     *
+     * @since 5.3
+     */
+    public static final String GAMEMODE_KEY = "gamemode";
+
 }
@@ -26,7 +26,6 @@
 package net.luckperms.api.context;

 import net.luckperms.api.LuckPermsProvider;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.Objects;
@@ -67,7 +66,7 @@ public interface ImmutableContextSet extends ContextSet {
    }

    /**
-     * @deprecated Already immutable!
+     * @deprecated This context set is already immutable!
     */
    @Override
    @Deprecated
@@ -119,7 +118,7 @@ public interface ImmutableContextSet extends ContextSet {
        }

        /**
-         * Adds of of the contexts in another {@link ContextSet} to the set.
+         * Adds all the contexts in another {@link ContextSet} to the set.
         *
         * @param contextSet the set to add from
         * @return the builder
@@ -26,7 +26,6 @@
 package net.luckperms.api.context;

 import net.luckperms.api.LuckPermsProvider;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.Objects;
@@ -94,7 +93,7 @@ public interface MutableContextSet extends ContextSet {
    }

    /**
-     * Adds of of the contexts in another {@link ContextSet} to this set.
+     * Adds all the contexts in another {@link ContextSet} to this set.
     *
     * @param contextSet the set to add from
     * @throws NullPointerException if the contextSet is null
@@ -0,0 +1,30 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Context functionality, including {@link net.luckperms.api.context.ContextSet}s and
+ * {@link net.luckperms.api.context.ContextCalculator}s.
+ */
+package net.luckperms.api.context;
@@ -26,6 +26,7 @@
 package net.luckperms.api.event;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.Set;
 import java.util.function.Consumer;
@@ -49,7 +50,7 @@ public interface EventBus {
     * @param <T>        the event class
     * @return an event handler instance representing this subscription
     */
-    @NonNull <T extends LuckPermsEvent> EventSubscription<T> subscribe(@NonNull Class<T> eventClass, @NonNull Consumer<? super T> handler);
+    <T extends LuckPermsEvent> @NonNull EventSubscription<T> subscribe(@NonNull Class<T> eventClass, @NonNull Consumer<? super T> handler);

    /**
     * Registers a new subscription to the given event.
@@ -69,7 +70,7 @@ public interface EventBus {
     * @param handler    the event handler
     * @return an event handler instance representing this subscription
     */
-    @NonNull <T extends LuckPermsEvent> EventSubscription<T> subscribe(Object plugin, @NonNull Class<T> eventClass, @NonNull Consumer<? super T> handler);
+    <T extends LuckPermsEvent> @NonNull EventSubscription<T> subscribe(Object plugin, @NonNull Class<T> eventClass, @NonNull Consumer<? super T> handler);

    /**
     * Gets a set of all registered handlers for a given event.
@@ -78,6 +79,6 @@ public interface EventBus {
     * @param <T>        the event class
     * @return an immutable set of event handlers
     */
-    @NonNull <T extends LuckPermsEvent> Set<EventSubscription<T>> getSubscriptions(@NonNull Class<T> eventClass);
+    <T extends LuckPermsEvent> @NonNull @Unmodifiable Set<EventSubscription<T>> getSubscriptions(@NonNull Class<T> eventClass);

 }
@@ -26,7 +26,6 @@
 package net.luckperms.api.event;

 import net.luckperms.api.LuckPerms;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -35,6 +35,12 @@ public enum DeletionCause {
     */
    COMMAND,

+    /**
+     * The deletion was caused by the web editor
+     * @since 5.3
+     */
+    WEB_EDITOR,
+
    /**
     * The deletion was caused by an API call
     */
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Event causes.
+ */
+package net.luckperms.api.event.cause;
@@ -0,0 +1,75 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.event.context;
+
+import net.luckperms.api.context.ContextManager;
+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.Optional;
+
+/**
+ * Called when a subject's current/active contexts are updated.
+ *
+ * <p>There are no guarantees that this event will be called for every update. It is merely to be
+ * used as a "hint" for plugins which depend on the current active contexts for a player.</p>
+ *
+ * <p>It will always be fired following a call to
+ * {@link ContextManager#signalContextUpdate(Object)}.</p>
+ *
+ * <p>The {@link #getSubject() subject} is always an instance of the platform's subject type. See
+ * {@link ContextManager} for details.</p>
+ *
+ * <p>Unlike most other LuckPerms events, this event is not fired asynchronously. Care should be
+ * taken to ensure listeners are lightweight. Additionally, listeners should ensure they do not
+ * cause further updates to player context, thus possibly causing a stack overflow.</p>
+ *
+ * @since 5.2
+ */
+public interface ContextUpdateEvent extends LuckPermsEvent {
+
+    /**
+     * Gets the subject whose contexts were updated.
+     *
+     * @return the subject
+     */
+    @Param(0)
+    @NonNull Object getSubject();
+
+    /**
+     * Gets the subject whose contexts were updated, casted to a given type.
+     *
+     * @param subjectClass the type to cast to
+     * @param <T> the subject type
+     * @return the casted subject
+     */
+    default <T> @NonNull Optional<T> getSubject(@NonNull Class<T> subjectClass) {
+        Object subject = getSubject();
+        return subjectClass.isInstance(subject) ? Optional.of(subjectClass.cast(subject)) : Optional.empty();
+    }
+
+}
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.context.Context}s.
+ */
+package net.luckperms.api.event.context;
@@ -28,7 +28,6 @@ package net.luckperms.api.event.extension;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.extension.Extension;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.extension.Extension}s.
+ */
+package net.luckperms.api.event.extension;
@@ -29,7 +29,6 @@ import net.luckperms.api.cacheddata.CachedDataManager;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.group.Group;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.group;

 import net.luckperms.api.event.LuckPermsEvent;
-import net.luckperms.api.event.util.Param;
 import net.luckperms.api.event.cause.CreationCause;
+import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.group.Group;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -29,7 +29,6 @@ import net.luckperms.api.cacheddata.CachedDataManager;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.group.Group;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.group;

 import net.luckperms.api.event.LuckPermsEvent;
-import net.luckperms.api.event.util.Param;
 import net.luckperms.api.event.cause.DeletionCause;
+import net.luckperms.api.event.util.Param;
 import net.luckperms.api.node.Node;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.Set;
@@ -28,7 +28,6 @@ package net.luckperms.api.event.group;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.group.Group;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.model.group.Group}s.
+ */
+package net.luckperms.api.event.group;
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.log;

 import net.luckperms.api.actionlog.Action;
-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.log;

 import net.luckperms.api.actionlog.Action;
-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.UUID;
@@ -26,11 +26,10 @@
 package net.luckperms.api.event.log;

 import net.luckperms.api.actionlog.Action;
-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.platform.PlatformEntity;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.log;

 import net.luckperms.api.actionlog.Action;
-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -28,7 +28,6 @@ package net.luckperms.api.event.log;
 import net.luckperms.api.actionlog.Action;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.UUID;
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to the {@link net.luckperms.api.actionlog.ActionLog}.
+ */
+package net.luckperms.api.event.log;
@@ -27,8 +27,12 @@ package net.luckperms.api.event.node;

 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.node.Node;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;

 /**
 * Called when a node is added to a holder
@@ -40,7 +44,14 @@ public interface NodeAddEvent extends NodeMutateEvent {
     *
     * @return the node that was added
     */
-    @Param(4)
+    @Param(3)
    @NonNull Node getNode();

+    @Override
+    default @NonNull @Unmodifiable Set<Node> getDataBefore() {
+        // Get data after, then reverse the action
+        Set<Node> nodes = new HashSet<>(this.getDataAfter());
+        nodes.remove(this.getNode());
+        return Collections.unmodifiableSet(nodes);
+    }
 }
@@ -25,9 +25,34 @@

 package net.luckperms.api.event.node;

+import net.luckperms.api.event.util.Param;
+import net.luckperms.api.node.Node;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
 /**
 * Called when a holder has their nodes cleared
 */
 public interface NodeClearEvent extends NodeMutateEvent {

+    /**
+     * Gets the nodes that were cleared
+     *
+     * @return the nodes that were removed
+     * @since 5.3
+     */
+    @Param(3)
+    @NonNull @Unmodifiable Set<Node> getNodes();
+
+    @Override
+    default @NonNull @Unmodifiable Set<Node> getDataBefore() {
+        // Get data after, then reverse the action
+        Set<Node> nodes = new HashSet<>(this.getDataAfter());
+        nodes.addAll(this.getNodes());
+        return Collections.unmodifiableSet(nodes);
+    }
 }
@@ -32,8 +32,8 @@ import net.luckperms.api.model.data.DataType;
 import net.luckperms.api.model.group.Group;
 import net.luckperms.api.model.user.User;
 import net.luckperms.api.node.Node;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.Set;

@@ -63,16 +63,15 @@ public interface NodeMutateEvent extends LuckPermsEvent {
     *
     * @return the data before the change
     */
-    @Param(2)
-    @NonNull Set<Node> getDataBefore();
+    @NonNull @Unmodifiable Set<Node> getDataBefore();

    /**
     * Gets an immutable copy of the holders data after the change
     *
     * @return the data after the change
     */
-    @Param(3)
-    @NonNull Set<Node> getDataAfter();
+    @Param(2)
+    @NonNull @Unmodifiable Set<Node> getDataAfter();

    /**
     * Gets whether the target of this event is a {@link User}
@@ -27,8 +27,12 @@ package net.luckperms.api.event.node;

 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.node.Node;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;

 /**
 * Called when a node is removed from a holder
@@ -40,7 +44,15 @@ public interface NodeRemoveEvent extends NodeMutateEvent {
     *
     * @return the node that was removed
     */
-    @Param(4)
+    @Param(3)
    @NonNull Node getNode();

+    @Override
+    default @NonNull @Unmodifiable Set<Node> getDataBefore() {
+        // Get data after, then reverse the action
+        Set<Node> nodes = new HashSet<>(this.getDataAfter());
+        nodes.add(this.getNode());
+        return Collections.unmodifiableSet(nodes);
+    }
+
 }
@@ -0,0 +1,30 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to changes to a {@link net.luckperms.api.model.user.User} or
+ * {@link net.luckperms.api.model.group.Group}s {@link net.luckperms.api.model.data.NodeMap}.
+ */
+package net.luckperms.api.event.node;
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Main events package.
+ */
+package net.luckperms.api.event;
@@ -29,7 +29,6 @@ import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.PlayerSaveResult;
 import net.luckperms.api.model.user.UserManager;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.UUID;
@@ -29,7 +29,6 @@ import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.user.User;
 import net.luckperms.api.util.Result;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;

@@ -0,0 +1,101 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.event.player.lookup;
+
+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.ResultEvent;
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.Objects;
+import java.util.UUID;
+
+/**
+ * Called when the platform needs to determine the type of a player's {@link UUID unique id}.
+ *
+ * @since 5.3
+ */
+public interface UniqueIdDetermineTypeEvent extends LuckPermsEvent, ResultEvent<String> {
+
+    /**
+     * The players UUID has been obtained by authenticating with the Mojang session servers.
+     *
+     * <p>Usually indicated by the UUID being {@link UUID#version() version} 4.</p>
+     */
+    String TYPE_AUTHENTICATED = "authenticated";
+
+    /**
+     * The players UUID has not been obtained through authentication, and instead is likely based
+     * on the username they connected with.
+     *
+     * <p>Usually indicated by the UUID being {@link UUID#version() version} 3.</p>
+     */
+    String TYPE_UNAUTHENTICATED = "unauthenticated";
+
+    /**
+     * The players UUID most likely belongs to a NPC (non-player character).
+     *
+     * <p>Usually indicated by the UUID being {@link UUID#version() version} 2.</p>
+     *
+     * @since 5.4
+     */
+    String TYPE_NPC = "npc";
+
+    /**
+     * Unknown UUID type.
+     *
+     * @since 5.4
+     */
+    String TYPE_UNKNOWN = "unknown";
+
+    /**
+     * Gets the {@link UUID unique id} being queried.
+     *
+     * @return the unique id
+     */
+    @Param(0)
+    @NonNull UUID getUniqueId();
+
+    /**
+     * Gets the current result unique id type.
+     *
+     * @return the type
+     */
+    default @NonNull String getType() {
+        return result().get();
+    }
+
+    /**
+     * Sets the result unique id type.
+     *
+     * @param type the type
+     */
+    default void setType(@NonNull String type) {
+        Objects.requireNonNull(type, "type");
+        result().set(type);
+    }
+
+}
@@ -0,0 +1,60 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.event.player.lookup;
+
+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.ResultEvent;
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.UUID;
+
+/**
+ * Called when the platform needs a unique id for a given username.
+ *
+ * @since 5.3
+ */
+public interface UniqueIdLookupEvent extends LuckPermsEvent, ResultEvent<UUID> {
+
+    /**
+     * Gets the username being looked up.
+     *
+     * @return the username
+     */
+    @Param(0)
+    @NonNull String getUsername();
+
+    /**
+     * Sets the result unique id.
+     *
+     * @param uniqueId the unique id
+     */
+    default void setUniqueId(@Nullable UUID uniqueId) {
+        result().set(uniqueId);
+    }
+
+}
@@ -0,0 +1,60 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.event.player.lookup;
+
+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.ResultEvent;
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.UUID;
+
+/**
+ * Called when the platform needs a username for a given unique id.
+ *
+ * @since 5.3
+ */
+public interface UsernameLookupEvent extends LuckPermsEvent, ResultEvent<String> {
+
+    /**
+     * Gets the {@link UUID unique id} being looked up.
+     *
+     * @return the unique id
+     */
+    @Param(0)
+    @NonNull UUID getUniqueId();
+
+    /**
+     * Sets the result username.
+     *
+     * @param username the username
+     */
+    default void setUsername(@Nullable String username) {
+        result().set(username);
+    }
+
+}
@@ -23,48 +23,53 @@
 *  SOFTWARE.
 */

-package me.lucko.luckperms.common.metastacking;
+package net.luckperms.api.event.player.lookup;

-import net.luckperms.api.metastacking.MetaStackDefinition;
-import net.luckperms.api.node.ChatMetaType;
-import net.luckperms.api.node.types.ChatMetaNode;
+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.concurrent.atomic.AtomicBoolean;

 /**
- * A live stack of {@link MetaStackEntry} instances, formed from a
- * {@link MetaStackDefinition}.
+ * Called when the validity of a username is being tested.
 *
- * This class is used to construct a formatted string, by accumulating
- * nodes to each element.
+ * @since 5.3
 */
-public interface MetaStack {
+public interface UsernameValidityCheckEvent extends LuckPermsEvent {

    /**
-     * Gets the definition this stack is based upon
+     * Gets the username being tested.
     *
-     * @return the definition of the stack
+     * @return the username
     */
-    MetaStackDefinition getDefinition();
+    @Param(0)
+    @NonNull String getUsername();

    /**
-     * Gets the target of this stack
+     * Gets the current validity state for the username.
     *
-     * @return the stack target
+     * @return the validity state
     */
-    ChatMetaType getTargetType();
+    @Param(1)
+    @NonNull AtomicBoolean validityState();

    /**
-     * Returns a formatted string, as defined by the {@link MetaStackDefinition},
-     * using the accumulated elements in the stack.
+     * Gets if the username is currently considered to be valid.
     *
-     * @return the string output
+     * @return if the username is valid
     */
-    String toFormattedString();
+    default boolean isValid() {
+        return validityState().get();
+    }

    /**
-     * Tries to accumulate the given node to all elements in the stack.
+     * Sets if the username should be considered valid or not.
     *
-     * @param node the node to accumulate
+     * @param valid whether the username is valid
     */
-    void accumulateToAll(ChatMetaNode<?, ?> node);
+    default void setValid(boolean valid) {
+        validityState().set(valid);
+    }

 }
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to a player {@link java.util.UUID unique id} or username lookup.
+ */
+package net.luckperms.api.event.player.lookup;
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to a player.
+ */
+package net.luckperms.api.event.player;
@@ -26,7 +26,6 @@
 package net.luckperms.api.event.source;

 import net.luckperms.api.platform.PlatformEntity;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,7 +26,6 @@
 package net.luckperms.api.event.source;

 import net.luckperms.api.platform.PlatformEntity;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Event sources.
+ */
+package net.luckperms.api.event.source;
@@ -25,10 +25,9 @@

 package net.luckperms.api.event.sync;

-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.UUID;
@@ -25,8 +25,8 @@

 package net.luckperms.api.event.sync;

-import net.luckperms.api.event.type.Cancellable;
 import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;

 /**
 * Called before a sync task runs
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.LuckPerms#runUpdateTask() sync/update task}s.
+ */
+package net.luckperms.api.event.sync;
@@ -26,10 +26,9 @@
 package net.luckperms.api.event.track;

 import net.luckperms.api.event.LuckPermsEvent;
-import net.luckperms.api.event.util.Param;
 import net.luckperms.api.event.cause.CreationCause;
+import net.luckperms.api.event.util.Param;
 import net.luckperms.api.track.Track;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,9 +26,8 @@
 package net.luckperms.api.event.track;

 import net.luckperms.api.event.LuckPermsEvent;
-import net.luckperms.api.event.util.Param;
 import net.luckperms.api.event.cause.DeletionCause;
-
+import net.luckperms.api.event.util.Param;
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.List;
@@ -28,7 +28,6 @@ package net.luckperms.api.event.track;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.track.Track;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -26,7 +26,6 @@
 package net.luckperms.api.event.track.mutate;

 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -28,8 +28,8 @@ package net.luckperms.api.event.track.mutate;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.track.Track;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.util.List;

@@ -52,7 +52,7 @@ public interface TrackMutateEvent extends LuckPermsEvent {
     * @return the data before the change
     */
    @Param(1)
-    @NonNull List<String> getStateBefore();
+    @NonNull @Unmodifiable List<String> getStateBefore();

    /**
     * Gets an immutable copy of the tracks data after the change
@@ -60,6 +60,6 @@ public interface TrackMutateEvent extends LuckPermsEvent {
     * @return the data after the change
     */
    @Param(2)
-    @NonNull List<String> getStateAfter();
+    @NonNull @Unmodifiable List<String> getStateAfter();

 }
@@ -26,7 +26,6 @@
 package net.luckperms.api.event.track.mutate;

 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to changes to a {@link net.luckperms.api.track.Track}s contents.
+ */
+package net.luckperms.api.event.track.mutate;
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.track.Track}s.
+ */
+package net.luckperms.api.event.track;
@@ -26,7 +26,6 @@
 package net.luckperms.api.event.type;

 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.concurrent.atomic.AtomicBoolean;
@@ -0,0 +1,58 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package net.luckperms.api.event.type;
+
+import net.luckperms.api.event.util.Param;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * Represents an event that has a result.
+ *
+ * @param <T> the type of the result
+ * @since 5.3
+ */
+public interface ResultEvent<T> {
+
+    /**
+     * Gets an {@link AtomicReference} containing the result.
+     *
+     * @return the result
+     */
+    @Param(-1)
+    @NonNull AtomicReference<T> result();
+
+    /**
+     * Gets if a result has been set for the event.
+     *
+     * @return if there is a result
+     */
+    default boolean hasResult() {
+        return result().get() != null;
+    }
+
+}
@@ -27,7 +27,6 @@ package net.luckperms.api.event.type;

 import net.luckperms.api.event.source.Source;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Event abstract types.
+ */
+package net.luckperms.api.event.type;
@@ -29,7 +29,6 @@ import net.luckperms.api.cacheddata.CachedDataManager;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.user.User;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -29,7 +29,6 @@ import net.luckperms.api.cacheddata.CachedDataManager;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.user.User;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -27,7 +27,6 @@ package net.luckperms.api.event.user;

 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.UUID;
@@ -28,7 +28,6 @@ package net.luckperms.api.event.user;
 import net.luckperms.api.event.LuckPermsEvent;
 import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.user.User;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -23,22 +23,27 @@
 *  SOFTWARE.
 */

-package me.lucko.luckperms.common.node.model;
-
-import net.luckperms.api.model.PermissionHolder;
-import net.luckperms.api.node.metadata.types.InheritanceOriginMetadata;
+package net.luckperms.api.event.user;

+import net.luckperms.api.event.LuckPermsEvent;
+import net.luckperms.api.event.type.Cancellable;
+import net.luckperms.api.event.util.Param;
+import net.luckperms.api.model.user.User;
 import org.checkerframework.checker.nullness.qual.NonNull;

-public class InheritanceOrigin implements InheritanceOriginMetadata {
-    private final PermissionHolder.Identifier location;
+/**
+ * Called when a user is about to be unloaded from memory.
+ *
+ * @since 5.3
+ */
+public interface UserUnloadEvent extends LuckPermsEvent, Cancellable {

-    public InheritanceOrigin(PermissionHolder.Identifier location) {
-        this.location = location;
-    }
+    /**
+     * Gets the user that is being unloaded
+     *
+     * @return the user that is being unloaded
+     */
+    @Param(0)
+    @NonNull User getUser();

-    @Override
-    public PermissionHolder.@NonNull Identifier getOrigin() {
-        return this.location;
-    }
 }
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to {@link net.luckperms.api.model.user.User}s.
+ */
+package net.luckperms.api.event.user;
@@ -26,11 +26,10 @@
 package net.luckperms.api.event.user.track;

 import net.luckperms.api.event.LuckPermsEvent;
-import net.luckperms.api.event.util.Param;
 import net.luckperms.api.event.type.Sourced;
+import net.luckperms.api.event.util.Param;
 import net.luckperms.api.model.user.User;
 import net.luckperms.api.track.Track;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 import java.util.Optional;
@@ -0,0 +1,30 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Events relating to a {@link net.luckperms.api.model.user.User}s movement on a
+ * {@link net.luckperms.api.track.Track}.
+ */
+package net.luckperms.api.event.user.track;
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Event utilities.
+ */
+package net.luckperms.api.event.util;
@@ -26,6 +26,7 @@
 package net.luckperms.api.extension;

 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Unmodifiable;

 import java.io.IOException;
 import java.nio.file.Path;
@@ -57,6 +58,6 @@ public interface ExtensionManager {
     *
     * @return the loaded extensions
     */
-    @NonNull Collection<Extension> getLoadedExtensions();
+    @NonNull @Unmodifiable Collection<Extension> getLoadedExtensions();

 }
@@ -23,10 +23,7 @@
 *  SOFTWARE.
 */

-package me.lucko.luckperms.common.util;
-
-public interface ThrowingRunnable {
-
-    void run() throws Exception;
-
-}
+/**
+ * {@link net.luckperms.api.extension.Extension}s functionality.
+ */
+package net.luckperms.api.extension;
@@ -27,7 +27,6 @@ package net.luckperms.api.messaging;

 import net.luckperms.api.LuckPerms;
 import net.luckperms.api.model.user.User;
-
 import org.checkerframework.checker.nullness.qual.NonNull;

 /**
@@ -40,7 +39,7 @@ public interface MessagingService {
     *
     * @return the name of this messaging service
     */
-    String getName();
+    @NonNull String getName();

    /**
     * Uses the messaging service to inform other servers about a general
@@ -0,0 +1,29 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * {@link net.luckperms.api.messaging.MessagingService} functionality.
+ */
+package net.luckperms.api.messaging;
@@ -27,13 +27,14 @@ package net.luckperms.api.messenger;

 import net.luckperms.api.messenger.message.Message;
 import net.luckperms.api.messenger.message.OutgoingMessage;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.NonExtendable;

 /**
 * Encapsulates the LuckPerms system which accepts incoming {@link Message}s
 * from implementations of {@link Messenger}.
 */
+@NonExtendable
 public interface IncomingMessageConsumer {

    /**
@@ -27,12 +27,13 @@ package net.luckperms.api.messenger;

 import net.luckperms.api.messenger.message.Message;
 import net.luckperms.api.messenger.message.OutgoingMessage;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.OverrideOnly;

 /**
 * Represents an object which dispatches {@link OutgoingMessage}s.
 */
+@OverrideOnly
 public interface Messenger extends AutoCloseable {

    /**
@@ -26,8 +26,8 @@
 package net.luckperms.api.messenger;

 import net.luckperms.api.LuckPerms;
-
 import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus.OverrideOnly;

 /**
 * Represents a provider for {@link Messenger} instances.
@@ -37,6 +37,7 @@ import org.checkerframework.checker.nullness.qual.NonNull;
 *
 * @see LuckPerms#registerMessengerProvider(MessengerProvider)
 */
+@OverrideOnly
 public interface MessengerProvider {

    /**