/home/leaf/crossfire/jxclient/trunk/model/src/main/java/com/realtime/crossfire/jxclient/items/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) 2006-2011 Andreas Kirschbaum.
 */

package com.realtime.crossfire.jxclient.items;

import java.lang.reflect.InvocationTargetException;
import javax.swing.SwingUtilities;
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 = 0;

    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) {
                            sync.wait();
                            fireEvent = false;
                        } else {
                            final long delay = Math.max(nextAction, nextActionNotBefore)-now;
                            if (delay > 0) {
                                sync.wait(delay);
                                fireEvent = false;
                            } else {
                                fireEvent = true;
                            }
                        }
                    }

                    if (fireEvent) {
                        try {
                            SwingUtilities.invokeAndWait(eventSchedulerCallback);
                        } catch (final InvocationTargetException ex) {
                            throw new AssertionError(ex);
                        }
                        nextAction = 0;
                        nextActionNotBefore = System.currentTimeMillis()+afterEventDelay;
                    }
                } 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");
    }

    public void start() {
        thread.start();
    }

    public void trigger() {
        final long now = System.currentTimeMillis();
        synchronized (sync) {
            nextAction = now+delay;
            sync.notifyAll();
        }
    }

}

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