001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.messaging;
016    
017    import com.liferay.portal.kernel.cache.thread.local.Lifecycle;
018    import com.liferay.portal.kernel.cache.thread.local.ThreadLocalCacheManager;
019    import com.liferay.portal.kernel.concurrent.ThreadPoolExecutor;
020    import com.liferay.portal.kernel.log.Log;
021    import com.liferay.portal.kernel.log.LogFactoryUtil;
022    import com.liferay.portal.kernel.util.CentralizedThreadLocal;
023    
024    import java.util.Set;
025    
026    /**
027     * <p>
028     * Destination that delivers a message to a list of message listeners in
029     * parallel.
030     * </p>
031     *
032     * @author Michael C. Han
033     */
034    public class ParallelDestination extends BaseAsyncDestination {
035    
036            @Override
037            protected void dispatch(
038                    Set<MessageListener> messageListeners, final Message message) {
039    
040                    final Thread currentThread = Thread.currentThread();
041    
042                    ThreadPoolExecutor threadPoolExecutor = getThreadPoolExecutor();
043    
044                    for (final MessageListener messageListener : messageListeners) {
045                            Runnable runnable = new MessageRunnable(message) {
046    
047                                    @Override
048                                    public void run() {
049                                            try {
050                                                    populateThreadLocalsFromMessage(message);
051    
052                                                    messageListener.receive(message);
053                                            }
054                                            catch (MessageListenerException mle) {
055                                                    _log.error("Unable to process message " + message, mle);
056                                            }
057                                            finally {
058                                                    if (Thread.currentThread() != currentThread) {
059                                                            ThreadLocalCacheManager.clearAll(Lifecycle.REQUEST);
060    
061                                                            CentralizedThreadLocal.
062                                                                    clearShortLivedThreadLocals();
063                                                    }
064                                            }
065                                    }
066    
067                            };
068    
069                            threadPoolExecutor.execute(runnable);
070                    }
071            }
072    
073            private static final Log _log = LogFactoryUtil.getLog(
074                    ParallelDestination.class);
075    
076    }