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The source code/* * Copyright (c) 2003, Rafael Steil * All rights reserved. * * Redistribution and use in source and binary forms, * with or without modification, are permitted provided * that the following conditions are met: * * 1) Redistributions of source code must retain the above * copyright notice, this list of conditions and the * following disclaimer. * 2) Redistributions in binary form must reproduce the * above copyright notice, this list of conditions and * the following disclaimer in the documentation and/or * other materials provided with the distribution. * 3) Neither the name of "Rafael Steil" nor * the names of its contributors may be used to endorse * or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER * IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE * * This file creation date: Jan 28, 2004 * The JForum Project * http://www.jforum.net */ package net.jforum.util.concurrent.executor; import org.apache.log4j.Logger; import net.jforum.util.concurrent.Executor; import net.jforum.util.concurrent.Queue; import net.jforum.util.concurrent.Result; import net.jforum.util.concurrent.Task; import net.jforum.util.concurrent.queue.UnboundedFifoQueue; import net.jforum.util.preferences.ConfigKeys; import net.jforum.util.preferences.SystemGlobals; /** * @author Rodrigo Kumpera * @version $Id: QueuedExecutor.java,v 1.8 2004/10/14 02:23:17 rafaelsteil Exp $ */ public class QueuedExecutor implements Executor { private Thread currentThread; private final Queue queue; private final Object lock = new Object(); private static final Logger logger = Logger.getLogger(QueuedExecutor.class); private static QueuedExecutor instance = new QueuedExecutor(new UnboundedFifoQueue()); private QueuedExecutor(Queue queue) { logger.info("Setting queue..."); this.queue = queue; } public static QueuedExecutor getInstance() { return instance; } private class WorkerThread extends AbstractWorker { protected Object take() throws InterruptedException { return queue.get(); } protected void cleanup() { synchronized(lock) { currentThread = null; logger.info("Cleaning up the thread..."); } } } public void execute(Task task) throws InterruptedException { if (SystemGlobals.getBoolValue(ConfigKeys.BACKGROUND_TASKS)) { queue.put(task); synchronized(lock) { if(currentThread == null) { logger.info("Creating a new thread..."); currentThread = new Thread(new WorkerThread(), "jforum"); currentThread.setDaemon(true); currentThread.start(); } } } else { try { task.execute(); } catch (Exception e) { logger.warn("Error while executing a task: " + e); } } } public Result executeWithResult(Task task) throws InterruptedException { SimpleResult result = new SimpleResult(task); queue.put(result); synchronized(lock) { if(currentThread == null) { currentThread = new Thread(new WorkerThread(), "jforum"); currentThread.setDaemon(true); currentThread.setName(this.getClass().getName() + "Thread"); currentThread.start(); } } return result; } } |
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