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EventDebounce.java
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EventDebounce.java
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/*
* WorldGuard, a suite of tools for Minecraft
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldGuard team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldguard.bukkit.listener.debounce;
import com.sk89q.worldguard.bukkit.util.Events;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.bukkit.event.Cancellable;
import org.bukkit.event.Event;
import javax.annotation.Nullable;
import java.util.concurrent.TimeUnit;
public class EventDebounce<K> {
private final LoadingCache<K, Entry> cache;
public EventDebounce(int debounceTime) {
cache = CacheBuilder.newBuilder()
.maximumSize(1000)
.expireAfterWrite(debounceTime, TimeUnit.MILLISECONDS)
.concurrencyLevel(2)
.build(new CacheLoader<K, Entry>() {
@Override
public Entry load(K key) throws Exception {
return new Entry();
}
});
}
public <T extends Event & Cancellable> void fireToCancel(Cancellable originalEvent, T firedEvent, K key) {
Entry entry = cache.getUnchecked(key);
if (entry.cancelled != null) {
if (entry.cancelled) {
originalEvent.setCancelled(true);
}
} else {
boolean cancelled = Events.fireAndTestCancel(firedEvent);
if (cancelled) {
originalEvent.setCancelled(true);
}
entry.cancelled = cancelled;
}
}
@Nullable
public <T extends Event & Cancellable> Entry getIfNotPresent(K key, Cancellable originalEvent) {
Entry entry = cache.getUnchecked(key);
if (entry.cancelled != null) {
if (entry.cancelled) {
originalEvent.setCancelled(true);
}
return null;
} else {
return entry;
}
}
public static <K> EventDebounce<K> create(int debounceTime) {
return new EventDebounce<K>(debounceTime);
}
public static class Entry {
private Boolean cancelled;
public void setCancelled(boolean cancelled) {
this.cancelled = cancelled;
}
}
}