/home/leaf/crossfire/jxclient/trunk/model/src/main/java/com/realtime/crossfire/jxclient/faces/FileCacheFaceQueue.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.faces;

import java.util.Collection;
import java.util.HashSet;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.swing.ImageIcon;
import org.jetbrains.annotations.NotNull;

public class FileCacheFaceQueue extends AbstractFaceQueue {

    @NotNull
    private final Object sync = new Object();

    @NotNull
    private final ImageCache imageCacheOriginal;

    @NotNull
    private final ImageCache imageCacheScaled;

    @NotNull
    private final ImageCache imageCacheMagicMap;

    @NotNull
    private final ExecutorService executorService = Executors.newFixedThreadPool(1);

    @NotNull
    private final Collection<Face> pendingLoadFaces = new HashSet<Face>();

    private int id = 0;

    public FileCacheFaceQueue(@NotNull final ImageCache imageCacheOriginal, @NotNull final ImageCache imageCacheScaled, @NotNull final ImageCache imageCacheMagicMap) {
        this.imageCacheOriginal = imageCacheOriginal;
        this.imageCacheScaled = imageCacheScaled;
        this.imageCacheMagicMap = imageCacheMagicMap;
    }

    @Override
    public void reset() {
        synchronized (sync) {
            id++;
            pendingLoadFaces.clear();
        }
    }

    @Override
    public void loadFace(@NotNull final Face face) {
        final boolean doAdd;
        synchronized (sync) {
            doAdd = pendingLoadFaces.add(face);
        }
        if (doAdd) {
            executorService.submit(new LoadTask(face));
        }
    }

    public void saveFace(@NotNull final Face face, @NotNull final FaceImages faceImages) {
        executorService.submit(new SaveTask(face, faceImages));
    }

    private class LoadTask implements Runnable {

        private final int taskId = id;

        @NotNull
        private final Face face;

        private LoadTask(@NotNull final Face face) {
            this.face = face;
        }

        @Override
        public void run() {
            final Thread thread = Thread.currentThread();
            final String name = thread.getName();
            try {
                thread.setName("JXClient:LoadTask:face="+face.getFaceName());
                try {
                    if (taskId != id) {
                        return;
                    }

                    final ImageIcon originalImageIcon = imageCacheOriginal.load(face);
                    if (originalImageIcon == null) {
                        fireFaceFailed(face);
                        return;
                    }

                    final ImageIcon scaledImageIcon = imageCacheScaled.load(face);
                    if (scaledImageIcon == null) {
                        fireFaceFailed(face);
                        return;
                    }

                    final ImageIcon magicMapImageIcon = imageCacheMagicMap.load(face);
                    if (magicMapImageIcon == null) {
                        fireFaceFailed(face);
                        return;
                    }

                    fireFaceLoaded(face, new FaceImages(originalImageIcon, scaledImageIcon, magicMapImageIcon));
                } finally {
                    synchronized (sync) {
                        pendingLoadFaces.remove(face);
                    }
                }
            } finally {
                thread.setName(name);
            }
        }

    }

    private class SaveTask implements Runnable {

        @NotNull
        private final Face face;

        @NotNull
        private final FaceImages faceImages;

        private SaveTask(@NotNull final Face face, @NotNull final FaceImages faceImages) {
            this.face = face;
            this.faceImages = faceImages;
        }

        @Override
        public void run() {
            final Thread thread = Thread.currentThread();
            final String name = thread.getName();
            try {
                thread.setName("JXClient:SaveTask:face="+face.getFaceName());
                imageCacheOriginal.save(face, faceImages.getOriginalImageIcon());
                imageCacheScaled.save(face, faceImages.getScaledImageIcon());
                imageCacheMagicMap.save(face, faceImages.getMagicMapImageIcon());
            } finally {
                thread.setName(name);
            }
        }
    }

}

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