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81 lines
2.6 KiB
Java
81 lines
2.6 KiB
Java
/*
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* WorldEdit, a Minecraft world manipulation toolkit
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* Copyright (C) sk89q <http://www.sk89q.com>
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* Copyright (C) WorldEdit team and contributors
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package com.sk89q.worldedit.forge;
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import net.minecraft.entity.player.EntityPlayerMP;
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import net.minecraft.server.MinecraftServer;
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import net.minecraftforge.fml.common.FMLCommonHandler;
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import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
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import net.minecraftforge.fml.common.gameevent.TickEvent;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.UUID;
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import java.util.concurrent.CopyOnWriteArraySet;
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/**
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* Caches data that cannot be accessed from another thread safely.
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*/
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public class ThreadSafeCache {
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private static final long REFRESH_DELAY = 1000 * 30;
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private static final ThreadSafeCache INSTANCE = new ThreadSafeCache();
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private Set<UUID> onlineIds = Collections.emptySet();
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private long lastRefresh = 0;
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/**
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* Get an concurrent-safe set of UUIDs of online players.
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*
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* @return a set of UUIDs
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*/
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public Set<UUID> getOnlineIds() {
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return onlineIds;
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}
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@SubscribeEvent
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public void tickStart(TickEvent event) {
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long now = System.currentTimeMillis();
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if (now - lastRefresh > REFRESH_DELAY) {
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Set<UUID> onlineIds = new HashSet<>();
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MinecraftServer server = FMLCommonHandler.instance().getMinecraftServerInstance();
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if (server == null || server.getPlayerList() == null) {
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return;
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}
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for (EntityPlayerMP player : server.getPlayerList().getPlayers()) {
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if (player != null) {
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onlineIds.add(player.getUniqueID());
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}
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}
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this.onlineIds = new CopyOnWriteArraySet<>(onlineIds);
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lastRefresh = now;
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}
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}
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public static ThreadSafeCache getInstance() {
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return INSTANCE;
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}
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}
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