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.backgroundtask;
016    
017    import com.liferay.portal.kernel.backgroundtask.BackgroundTaskStatus;
018    import com.liferay.portal.kernel.backgroundtask.BackgroundTaskStatusRegistry;
019    import com.liferay.portal.kernel.backgroundtask.BackgroundTaskStatusRegistryUtil;
020    import com.liferay.portal.kernel.cluster.ClusterMasterExecutorUtil;
021    import com.liferay.portal.kernel.log.Log;
022    import com.liferay.portal.kernel.log.LogFactoryUtil;
023    import com.liferay.portal.kernel.util.MethodHandler;
024    
025    import java.util.HashMap;
026    import java.util.Map;
027    import java.util.concurrent.Future;
028    import java.util.concurrent.locks.Lock;
029    import java.util.concurrent.locks.ReadWriteLock;
030    import java.util.concurrent.locks.ReentrantReadWriteLock;
031    
032    /**
033     * @author Michael C. Han
034     */
035    public class BackgroundTaskStatusRegistryImpl
036            implements BackgroundTaskStatusRegistry {
037    
038            @Override
039            public BackgroundTaskStatus getBackgroundTaskStatus(long backgroundTaskId) {
040                    if (!ClusterMasterExecutorUtil.isMaster()) {
041                            return getMasterBackgroundTaskStatus(backgroundTaskId);
042                    }
043    
044                    Lock lock = _readWriteLock.readLock();
045    
046                    lock.lock();
047    
048                    try {
049                            return _backgroundTaskStatuses.get(backgroundTaskId);
050                    }
051                    finally {
052                            lock.unlock();
053                    }
054            }
055    
056            @Override
057            public BackgroundTaskStatus registerBackgroundTaskStatus(
058                    long backgroundTaskId) {
059    
060                    Lock lock = _readWriteLock.writeLock();
061    
062                    lock.lock();
063    
064                    try {
065                            BackgroundTaskStatus backgroundTaskStatus =
066                                    _backgroundTaskStatuses.get(backgroundTaskId);
067    
068                            if (backgroundTaskStatus == null) {
069                                    backgroundTaskStatus = new BackgroundTaskStatus();
070    
071                                    _backgroundTaskStatuses.put(
072                                            backgroundTaskId, backgroundTaskStatus);
073                            }
074    
075                            return backgroundTaskStatus;
076                    }
077                    finally {
078                            lock.unlock();
079                    }
080            }
081    
082            @Override
083            public BackgroundTaskStatus unregisterBackgroundTaskStatus(
084                    long backgroundTaskId) {
085    
086                    Lock lock = _readWriteLock.writeLock();
087    
088                    lock.lock();
089    
090                    try {
091                            BackgroundTaskStatus backgroundTaskStatus =
092                                    _backgroundTaskStatuses.remove(backgroundTaskId);
093    
094                            return backgroundTaskStatus;
095                    }
096                    finally {
097                            lock.unlock();
098                    }
099            }
100    
101            protected BackgroundTaskStatus getMasterBackgroundTaskStatus(
102                    long backgroundTaskId) {
103    
104                    try {
105                            MethodHandler methodHandler = new MethodHandler(
106                                    BackgroundTaskStatusRegistryUtil.class.getDeclaredMethod(
107                                            "getBackgroundTaskStatus", long.class),
108                                    backgroundTaskId);
109    
110                            Future<BackgroundTaskStatus> future =
111                                    ClusterMasterExecutorUtil.executeOnMaster(methodHandler);
112    
113                            return future.get();
114                    }
115                    catch (Exception e) {
116                            _log.error("Unable to retrieve status from master node", e);
117                    }
118    
119                    return null;
120            }
121    
122            private static final Log _log = LogFactoryUtil.getLog(
123                    BackgroundTaskStatusRegistryImpl.class);
124    
125            private final Map<Long, BackgroundTaskStatus> _backgroundTaskStatuses =
126                    new HashMap<>();
127            private final ReadWriteLock _readWriteLock = new ReentrantReadWriteLock();
128    
129    }