001    // Copyright 2009 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.tynamo.jpa.internal;
016    
017    import org.tynamo.jpa.JPATransactionManager;
018    import org.tynamo.jpa.JPATransactionAdvisor;
019    import org.tynamo.jpa.annotations.CommitAfter;
020    import org.apache.tapestry5.ioc.Invocation;
021    import org.apache.tapestry5.ioc.MethodAdvice;
022    import org.apache.tapestry5.ioc.MethodAdviceReceiver;
023    
024    import java.lang.reflect.Method;
025    
026    public class JPATransactionAdvisorImpl implements JPATransactionAdvisor {
027        private final JPATransactionManager manager;
028    
029        /**
030         * The rules for advice are the same for any method: commit on success or checked exception, abort on thrown
031         * exception ... so we can use a single shared advice object.
032         */
033        private final MethodAdvice advice = new MethodAdvice() {
034            public void advise(Invocation invocation) {
035                try {
036                    invocation.proceed();
037                }
038                catch (RuntimeException ex) {
039                    manager.abort();
040    
041                    throw ex;
042                }
043    
044                // For success or checked exception, commit the transaction.
045    
046                manager.commit();
047            }
048        };
049    
050        public JPATransactionAdvisorImpl(JPATransactionManager manager) {
051            this.manager = manager;
052        }
053    
054        public void addTransactionCommitAdvice(MethodAdviceReceiver receiver) {
055            for (Method m : receiver.getInterface().getMethods()) {
056                if (m.getAnnotation(CommitAfter.class) != null) {
057                    receiver.adviseMethod(m, advice);
058                }
059            }
060        }
061    }