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.apache.tapestry5.internal.hibernate;
016    
017    import org.apache.tapestry5.hibernate.HibernateSessionManager;
018    import org.apache.tapestry5.hibernate.HibernateTransactionAdvisor;
019    import org.apache.tapestry5.hibernate.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 HibernateTransactionAdvisorImpl implements HibernateTransactionAdvisor
027    {
028        private final HibernateSessionManager manager;
029    
030        /**
031         * The rules for advice are the same for any method: commit on success or checked exception, abort on thrown
032         * exception ... so we can use a single shared advice object.
033         */
034        private final MethodAdvice advice = new MethodAdvice()
035        {
036            public void advise(Invocation invocation)
037            {
038                try
039                {
040                    invocation.proceed();
041                }
042                catch (RuntimeException ex)
043                {
044                    manager.abort();
045    
046                    throw ex;
047                }
048    
049                // For success or checked exception, commit the transaction.
050    
051                manager.commit();
052            }
053        };
054    
055        public HibernateTransactionAdvisorImpl(HibernateSessionManager manager)
056        {
057            this.manager = manager;
058        }
059    
060        public void addTransactionCommitAdvice(MethodAdviceReceiver receiver)
061        {
062            for (Method m : receiver.getInterface().getMethods())
063            {
064                if (m.getAnnotation(CommitAfter.class) != null)
065                {
066                    receiver.adviseMethod(m, advice);
067                }
068            }
069        }
070    }