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.kernel.backgroundtask;
016    
017    import com.liferay.portal.model.BackgroundTask;
018    
019    /**
020     * @author Michael C. Han
021     */
022    public class ClassLoaderAwareBackgroundTaskExecutor
023            extends DelegatingBackgroundTaskExecutor {
024    
025            public ClassLoaderAwareBackgroundTaskExecutor(
026                    BackgroundTaskExecutor backgroundTaskExecutor,
027                    ClassLoader classLoader) {
028    
029                    super(backgroundTaskExecutor);
030    
031                    _classLoader = classLoader;
032            }
033    
034            @Override
035            public BackgroundTaskResult execute(BackgroundTask backgroundTask)
036                    throws Exception {
037    
038                    Thread currentThread = Thread.currentThread();
039    
040                    ClassLoader contextClassLoader = currentThread.getContextClassLoader();
041    
042                    if (_classLoader != contextClassLoader) {
043                            currentThread.setContextClassLoader(_classLoader);
044                    }
045    
046                    try {
047                            BackgroundTaskExecutor backgroundTaskExecutor =
048                                    getBackgroundTaskExecutor();
049    
050                            return backgroundTaskExecutor.execute(backgroundTask);
051                    }
052                    finally {
053                            if (_classLoader != contextClassLoader) {
054                                    currentThread.setContextClassLoader(contextClassLoader);
055                            }
056                    }
057            }
058    
059            private ClassLoader _classLoader;
060    
061    }