001    /**
002     * Copyright (c) 2000-2013 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    
020    import java.util.HashMap;
021    import java.util.Map;
022    import java.util.concurrent.locks.Lock;
023    import java.util.concurrent.locks.ReadWriteLock;
024    import java.util.concurrent.locks.ReentrantReadWriteLock;
025    
026    /**
027     * @author Michael C. Han
028     */
029    public class BackgroundTaskStatusRegistryImpl
030            implements BackgroundTaskStatusRegistry {
031    
032            @Override
033            public BackgroundTaskStatus getBackgroundTaskStatus(long backgroundTaskId) {
034                    Lock lock = _readWriteLock.readLock();
035    
036                    lock.lock();
037    
038                    try {
039                            return _backgroundTaskStatuses.get(backgroundTaskId);
040                    }
041                    finally {
042                            lock.unlock();
043                    }
044            }
045    
046            @Override
047            public BackgroundTaskStatus registerBackgroundTaskStatus(
048                    long backgroundTaskId) {
049    
050                    Lock lock = _readWriteLock.writeLock();
051    
052                    lock.lock();
053    
054                    try {
055                            BackgroundTaskStatus backgroundTaskStatus =
056                                    _backgroundTaskStatuses.get(backgroundTaskId);
057    
058                            if (backgroundTaskStatus == null) {
059                                    backgroundTaskStatus = new BackgroundTaskStatus();
060    
061                                    _backgroundTaskStatuses.put(
062                                            backgroundTaskId, backgroundTaskStatus);
063                            }
064    
065                            return backgroundTaskStatus;
066                    }
067                    finally {
068                            lock.unlock();
069                    }
070            }
071    
072            @Override
073            public BackgroundTaskStatus unregisterBackgroundTaskStatus(
074                    long backgroundTaskId) {
075    
076                    Lock lock = _readWriteLock.writeLock();
077    
078                    lock.lock();
079    
080                    try {
081                            BackgroundTaskStatus backgroundTaskStatus =
082                                    _backgroundTaskStatuses.remove(backgroundTaskId);
083    
084                            return backgroundTaskStatus;
085                    }
086                    finally {
087                            lock.unlock();
088                    }
089            }
090    
091            private Map<Long, BackgroundTaskStatus> _backgroundTaskStatuses =
092                    new HashMap<Long, BackgroundTaskStatus>();
093            private ReadWriteLock _readWriteLock = new ReentrantReadWriteLock();
094    
095    }