SoundTaskExecutor.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff
 * Copyright (C) 2006-2017,2019-2023 Andreas Kirschbaum
 * Copyright (C) 2010-2012,2014-2018,2020-2023 Nicolas Weeger
 */
 
package com.realtime.crossfire.jxclient.sound;
 
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.Semaphore;
import org.jetbrains.annotations.NotNull;
 
public class SoundTaskExecutor {
 
    @NotNull
    private final BlockingQueue<Runnable> tasks = new LinkedBlockingQueue<>();
 
    @NotNull
    private final Thread thread = new Thread(this::executeTasks, "JXClient:SoundTaskExecutor");
 
    public SoundTaskExecutor() {
        thread.setDaemon(true);
    }
 
    public void start() {
        thread.start();
    }
 
    private void executeTasks() {
        while (!Thread.currentThread().isInterrupted()) {
            try {
                tasks.take().run();
            } catch (final InterruptedException ignored) {
                thread.interrupt();
                break;
            }
        }
    }
 
    public void execute(@NotNull final Runnable task) {
        if (Thread.currentThread() == thread) {
            throw new IllegalStateException("must not be called from a sound task");
        }
        tasks.offer(task);
    }
 
    public void executeAndWait(@NotNull final Runnable task) throws InterruptedException {
        if (Thread.currentThread() == thread) {
            throw new IllegalStateException("must not be called from a sound task");
        }
        final Semaphore sem = new Semaphore(0);
        tasks.offer(() -> {
            try {
                task.run();
            } finally {
                sem.release();
            }
        });
        sem.acquire();
    }
 
}