1/*
2 * Copyright (c) 2009-2010 jMonkeyEngine
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 *   may be used to endorse or promote products derived from this software
18 *   without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33package com.jme3.asset;
34
35import java.util.concurrent.Callable;
36import java.util.concurrent.ExecutorService;
37import java.util.concurrent.Executors;
38import java.util.concurrent.ThreadFactory;
39
40/**
41 * <code>ThreadingManager</code> manages the threads used to load content
42 * within the Content Manager system. A pool of threads and a task queue
43 * is used to load resource data and perform I/O while the application's
44 * render thread is active.
45 */
46public class ThreadingManager {
47
48    protected final ExecutorService executor =
49            Executors.newFixedThreadPool(2,
50                                         new LoadingThreadFactory());
51
52    protected final AssetManager owner;
53
54    protected int nextThreadId = 0;
55
56    public ThreadingManager(AssetManager owner){
57        this.owner = owner;
58    }
59
60    protected class LoadingThreadFactory implements ThreadFactory {
61        public Thread newThread(Runnable r) {
62            Thread t = new Thread(r, "pool" + (nextThreadId++));
63            t.setDaemon(true);
64            t.setPriority(Thread.MIN_PRIORITY);
65            return t;
66        }
67    }
68
69    protected class LoadingTask implements Callable<Object> {
70        private final String resourceName;
71        public LoadingTask(String resourceName){
72            this.resourceName = resourceName;
73        }
74        public Object call() throws Exception {
75            return owner.loadAsset(new AssetKey(resourceName));
76        }
77    }
78
79//    protected class MultiLoadingTask implements Callable<Void> {
80//        private final String[] resourceNames;
81//        public MultiLoadingTask(String[] resourceNames){
82//            this.resourceNames = resourceNames;
83//        }
84//        public Void call(){
85//            owner.loadContents(resourceNames);
86//            return null;
87//        }
88//    }
89
90//    public Future<Void> loadContents(String ... names){
91//        return executor.submit(new MultiLoadingTask(names));
92//    }
93
94//    public Future<Object> loadContent(String name) {
95//        return executor.submit(new LoadingTask(name));
96//    }
97
98    public static boolean isLoadingThread() {
99        return Thread.currentThread().getName().startsWith("pool");
100    }
101
102
103}
104