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Add special event handler that ensure this is the last listener of the event

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This commit is contained in:
Marc Baloup 2021-07-18 13:36:26 +02:00
parent f4642e22a1
commit 1cf77452df
Signed by: marcbal
GPG Key ID: BBC0FE3ABC30B893
1 changed files with 49 additions and 0 deletions
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49
Paper/src/main/java/fr/pandacube/lib/paper/util/BukkitEvent.java
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@ -2,6 +2,7 @@ package fr.pandacube.lib.paper.util;
import java.lang.reflect.Method;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import org.bukkit.Bukkit;
import org.bukkit.event.Event;
@ -11,6 +12,8 @@ import org.bukkit.event.HandlerList;
import org.bukkit.event.Listener;
import org.bukkit.plugin.EventExecutor;
import org.bukkit.plugin.IllegalPluginAccessException;
import org.bukkit.plugin.RegisteredListener;
import org.bukkit.scheduler.BukkitTask;
import fr.pandacube.lib.core.util.ReflexionUtil;
import fr.pandacube.lib.paper.PandaLibPaper;
@ -93,5 +96,51 @@ public class BukkitEvent {
}
}
/**
* Abstract implementation of {@link EventListener} that ensure as best as it can,
* that it is the last listener called to handle the event.
*
* @param <E> the type of the event
*/
public static abstract class EnforcedLastListener<E extends Event> implements EventListener<E> {
private final Class<E> eventClass;
private final boolean ignoreCancelled;
public EnforcedLastListener(Class<E> eventClass, boolean ignoreCancelled) {
this.eventClass = eventClass;
this.ignoreCancelled = ignoreCancelled;
register();
}
private void register() {
BukkitEvent.register(eventClass, this, EventPriority.MONITOR, ignoreCancelled);
}
@Override
public void execute(Listener var1, Event var2) throws EventException {
EventListener.super.execute(var1, var2);
checkIfListenerIsLast();
}
private AtomicReference<BukkitTask> listenerCheckTask = new AtomicReference<>();
private void checkIfListenerIsLast() {
synchronized (listenerCheckTask) {
if (listenerCheckTask.get() != null)
return;
RegisteredListener[] listeners = BukkitEvent.getHandlerList(eventClass).getRegisteredListeners();
if (listeners[listeners.length - 1].getListener() != this) {
listenerCheckTask.set(Bukkit.getScheduler().runTask(PandaLibPaper.getPlugin(), () -> {
// need to re-register the event so we are last
BukkitEvent.unregister(this);
register();
listenerCheckTask.set(null);
}));
}
}
}
}
}