EventScheduler.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.items;
 
import org.jetbrains.annotations.NotNull;
 
public class EventScheduler {
 
    private final int delay;
 
    private final int afterEventDelay;
 
    @NotNull
    private final Runnable eventSchedulerCallback;
 
    @NotNull
    private final Object sync = new Object();
 
    @NotNull
    private final Thread thread;
 
    private long nextAction;
 
    private long nextActionNotBefore = System.currentTimeMillis();
 
    @NotNull
    private final Runnable runnable = new Runnable() {
 
        @Override
        public void run() {
            while (true) {
                try {
                    final long now = System.currentTimeMillis();
                    final boolean fireEvent;
                    synchronized (sync) {
                        if (nextAction == 0) {
                            //noinspection WaitOrAwaitWithoutTimeout
                            sync.wait();
                            fireEvent = false;
                        } else {
                            final long thisDelay = Math.max(nextAction, nextActionNotBefore)-now;
                            if (thisDelay > 0) {
                                sync.wait(thisDelay);
                                fireEvent = false;
                            } else {
                                fireEvent = true;
                                nextAction = 0;
                                nextActionNotBefore = System.currentTimeMillis()+afterEventDelay;
                            }
                        }
                    }
 
                    if (fireEvent) {
                        eventSchedulerCallback.run();
                    }
                } catch (final InterruptedException ignored) {
                    thread.interrupt();
                    break;
                }
            }
        }
 
    };
 
    public EventScheduler(final int delay, final int afterEventDelay, @NotNull final Runnable eventSchedulerCallback) {
        this.delay = delay;
        this.afterEventDelay = afterEventDelay;
        this.eventSchedulerCallback = eventSchedulerCallback;
        thread = new Thread(runnable, "JXClient:EventScheduler");
        thread.setDaemon(true);
    }
 
    public void start() {
        thread.start();
    }
 
    public void trigger() {
        final long now = System.currentTimeMillis();
        synchronized (sync) {
            nextAction = now+delay;
            sync.notifyAll();
        }
    }
 
}