001    /**
002     * Copyright (c) 2000-2012 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.spring.transaction;
016    
017    import com.liferay.portal.kernel.annotation.AnnotationLocator;
018    import com.liferay.portal.kernel.transaction.Transactional;
019    import com.liferay.portal.kernel.util.MethodTargetClassKey;
020    
021    import java.lang.reflect.Method;
022    
023    import java.util.Map;
024    import java.util.concurrent.ConcurrentHashMap;
025    
026    import org.springframework.transaction.interceptor.DefaultTransactionAttribute;
027    import org.springframework.transaction.interceptor.TransactionAttribute;
028    import org.springframework.transaction.interceptor.TransactionAttributeSource;
029    
030    /**
031     * @author Shuyang Zhou
032     */
033    public class AnnotationTransactionAttributeSource
034            implements TransactionAttributeSource {
035    
036            public TransactionAttribute getTransactionAttribute(
037                    Method method, Class<?> targetClass) {
038    
039                    MethodTargetClassKey methodTargetClassKey = new MethodTargetClassKey(
040                            method, targetClass);
041    
042                    TransactionAttribute transactionAttribute = _transactionAttributes.get(
043                            methodTargetClassKey);
044    
045                    if (transactionAttribute != null) {
046                            if (transactionAttribute == _nullTransactionAttribute) {
047                                    return null;
048                            }
049                            else {
050                                    return transactionAttribute;
051                            }
052                    }
053    
054                    Transactional transactional = AnnotationLocator.locate(
055                            method, targetClass, Transactional.class);
056    
057                    transactionAttribute = TransactionAttributeBuilder.build(transactional);
058    
059                    if (transactionAttribute == null) {
060                            _transactionAttributes.put(
061                                    methodTargetClassKey, _nullTransactionAttribute);
062                    }
063                    else {
064                            _transactionAttributes.put(
065                                    methodTargetClassKey, transactionAttribute);
066                    }
067    
068                    return transactionAttribute;
069            }
070    
071            private static TransactionAttribute _nullTransactionAttribute =
072                    new DefaultTransactionAttribute();
073            private Map<MethodTargetClassKey, TransactionAttribute>
074                    _transactionAttributes =
075                            new ConcurrentHashMap<MethodTargetClassKey, TransactionAttribute>();
076    
077    }