* PacketManager micro optimization with the channel caching

* Player ejected when they leave

src/main/java/io/github/retrooper/packetevents/PacketEvents.java

@@ -305,5 +305,6 @@ public final class PacketEvents implements Listener, EventManager {
         getPlayerUtils().clientVersionsMap.remove(channel);
         getPlayerUtils().playerPingMap.remove(uuid);
         getPlayerUtils().playerSmoothedPingMap.remove(uuid);
+        packetManager.ejectPlayer(e.getPlayer());
     }
 }

src/main/java/io/github/retrooper/packetevents/example/MainExample.java

@@ -25,9 +25,6 @@
 package io.github.retrooper.packetevents.example;
 
 import io.github.retrooper.packetevents.PacketEvents;
-import io.github.retrooper.packetevents.event.PacketListenerDynamic;
-import io.github.retrooper.packetevents.event.impl.PostPlayerInjectEvent;
-import io.github.retrooper.packetevents.event.priority.PacketEventPriority;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public class MainExample extends JavaPlugin {

src/main/java/io/github/retrooper/packetevents/packetmanager/PacketManager.java

@@ -76,8 +76,9 @@ public class PacketManager {
     public Object getChannel(String name) {
         Object channel = channelMap.get(name);
         if(channel == null) {
-            channelMap.put(name, NMSUtils.getChannel(Bukkit.getPlayer(name)));
-            return channelMap.get(name);
+            channel = NMSUtils.getChannel(Bukkit.getPlayer(name));
+            channelMap.put(name, channel);
+            return channel;
         }
         return channel;
     }
@@ -132,6 +133,8 @@ public class PacketManager {
             } else {
                 Objects.requireNonNull(lateInjector).ejectPlayerSync(player);
             }
+            firstPacketCache.remove(getChannel(player.getName()));
+            channelMap.remove(player.getName());
         }
     }
 
@@ -145,6 +148,8 @@ public class PacketManager {
             } else {
                 Objects.requireNonNull(lateInjector).ejectPlayerAsync(player);
             }
+            firstPacketCache.remove(getChannel(player.getName()));
+            channelMap.remove(player.getName());
         }
     }