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.Lifecycle;
018    import com.liferay.portal.kernel.cache.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 one at a
029     * time.
030     * </p>
031     *
032     * @author Michael C. Han
033     */
034    public class SerialDestination extends BaseAsyncDestination {
035    
036            public SerialDestination() {
037                    setWorkersCoreSize(_WORKERS_CORE_SIZE);
038                    setWorkersMaxSize(_WORKERS_MAX_SIZE);
039            }
040    
041            /**
042             * @deprecated As of 6.1.0
043             */
044            @Deprecated
045            public SerialDestination(String name) {
046                    super(name, _WORKERS_CORE_SIZE, _WORKERS_MAX_SIZE);
047            }
048    
049            @Override
050            protected void dispatch(
051                    final Set<MessageListener> messageListeners, final Message message) {
052    
053                    ThreadPoolExecutor threadPoolExecutor = getThreadPoolExecutor();
054    
055                    Runnable runnable = new MessageRunnable(message) {
056    
057                            @Override
058                            public void run() {
059                                    try {
060                                            populateThreadLocalsFromMessage(message);
061    
062                                            for (MessageListener messageListener : messageListeners) {
063                                                    try {
064                                                            messageListener.receive(message);
065                                                    }
066                                                    catch (MessageListenerException mle) {
067                                                            _log.error(
068                                                                    "Unable to process message " + message, mle);
069                                                    }
070                                            }
071                                    }
072                                    finally {
073                                            ThreadLocalCacheManager.clearAll(Lifecycle.REQUEST);
074    
075                                            CentralizedThreadLocal.clearShortLivedThreadLocals();
076                                    }
077                            }
078    
079                    };
080    
081                    threadPoolExecutor.execute(runnable);
082            }
083    
084            private static final int _WORKERS_CORE_SIZE = 1;
085    
086            private static final int _WORKERS_MAX_SIZE = 1;
087    
088            private static final Log _log = LogFactoryUtil.getLog(
089                    SerialDestination.class);
090    
091    }