001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.messaging.async;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.messaging.MessageBusUtil;
020    import com.liferay.portal.kernel.messaging.async.Async;
021    import com.liferay.portal.kernel.util.MethodTargetClassKey;
022    import com.liferay.portal.spring.aop.AnnotationChainableMethodAdvice;
023    
024    import java.lang.annotation.Annotation;
025    import java.lang.reflect.Method;
026    
027    import java.util.Map;
028    
029    import org.aopalliance.intercept.MethodInvocation;
030    
031    /**
032     * @author Shuyang Zhou
033     * @author Brian Wing Shun Chan
034     */
035    public class AsyncAdvice extends AnnotationChainableMethodAdvice<Async> {
036    
037            public Object before(final MethodInvocation methodInvocation)
038                    throws Throwable {
039    
040                    MethodTargetClassKey methodTargetClassKey = buildMethodTargetClassKey(
041                            methodInvocation);
042    
043                    Async async = findAnnotation(methodTargetClassKey);
044    
045                    if (async == _nullAsync) {
046                            return null;
047                    }
048    
049                    Method method = methodTargetClassKey.getMethod();
050    
051                    if (method.getReturnType() != void.class) {
052                            if (_log.isWarnEnabled()) {
053                                    _log.warn(
054                                            "Async annotation on method " + method.getName() +
055                                                    " does not return void");
056                            }
057    
058                            return null;
059                    }
060    
061                    String destinationName = null;
062    
063                    if ((_destinationNames != null) && !_destinationNames.isEmpty()) {
064                            destinationName = _destinationNames.get(
065                                    methodTargetClassKey.getTargetClass());
066                    }
067    
068                    if (destinationName == null) {
069                            destinationName = _defaultDestinationName;
070                    }
071    
072                    MessageBusUtil.sendMessage(
073                            destinationName,
074                            new Runnable() {
075    
076                                    public void run() {
077                                            try {
078                                                    nextMethodInterceptor.invoke(methodInvocation);
079                                            }
080                                            catch (Throwable t) {
081                                                    throw new RuntimeException(t);
082                                            }
083                                    }
084    
085                                    public String toString() {
086                                            return methodInvocation.toString();
087                                    }
088    
089                            });
090    
091                    return nullResult;
092            }
093    
094            public String getDefaultDestinationName() {
095                    return _defaultDestinationName;
096            }
097    
098            public Async getNullAnnotation() {
099                    return _nullAsync;
100            }
101    
102            public void setDefaultDestinationName(String defaultDestinationName) {
103                    _defaultDestinationName = defaultDestinationName;
104            }
105    
106            public void setDestinationNames(Map<Class<?>, String> destinationNames) {
107                    _destinationNames = destinationNames;
108            }
109    
110            private static Async _nullAsync =
111                    new Async() {
112    
113                            public Class<? extends Annotation> annotationType() {
114                                    return Async.class;
115                            }
116    
117                    };
118    
119            private static Log _log = LogFactoryUtil.getLog(AsyncAdvice.class);
120    
121            private String _defaultDestinationName;
122            private Map<Class<?>, String> _destinationNames;
123    
124    }