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
015package org.apache.tapestry5.internal.hibernate;
016
017import org.apache.tapestry5.hibernate.HibernateSessionManager;
018import org.apache.tapestry5.hibernate.HibernateTransactionAdvisor;
019import org.apache.tapestry5.hibernate.annotations.CommitAfter;
020import org.apache.tapestry5.ioc.Invocation;
021import org.apache.tapestry5.ioc.MethodAdvice;
022import org.apache.tapestry5.ioc.MethodAdviceReceiver;
023
024import java.lang.reflect.Method;
025
026public 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}