001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.core.util.concurrent;
025    
026    import java.util.concurrent.BlockingQueue;
027    import java.util.concurrent.LinkedBlockingQueue;
028    import java.util.concurrent.ThreadPoolExecutor;
029    import java.util.concurrent.TimeUnit;
030    
031    import org.ujmp.core.util.UJMPSettings;
032    
033    public class UJMPThreadPoolExecutor extends ThreadPoolExecutor {
034    
035            private static final ThreadLocal<ThreadPoolExecutor> executors = new ThreadLocal<ThreadPoolExecutor>();
036    
037            public UJMPThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize,
038                            long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, int priority,
039                            boolean deamon) {
040                    super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, new UJMPThreadFactory(
041                                    name, priority, deamon));
042            }
043    
044            public UJMPThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize) {
045                    this(name, corePoolSize, maximumPoolSize, 500L, TimeUnit.MILLISECONDS,
046                                    new LinkedBlockingQueue<Runnable>());
047            }
048    
049            public UJMPThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize,
050                            long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) {
051                    this(name, maximumPoolSize, maximumPoolSize, keepAliveTime, unit, workQueue,
052                                    Thread.NORM_PRIORITY, true);
053            }
054    
055            public static final ThreadPoolExecutor getInstance() {
056                    return getInstance(UJMPSettings.getNumberOfThreads());
057            }
058    
059            public static final ThreadPoolExecutor getInstance(final int maximumPoolSize) {
060                    ThreadPoolExecutor es = executors.get();
061                    if (es == null) {
062                            synchronized (executors) {
063                                    es = new UJMPThreadPoolExecutor(Thread.currentThread().getName(), 0,
064                                                    maximumPoolSize);
065                                    executors.set(es);
066                            }
067                    }
068                    return es;
069            }
070    
071    }