001// Copyright 2008, 2011, 2012 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.annotations.CommitAfter;
019import org.apache.tapestry5.model.MutableComponentModel;
020import org.apache.tapestry5.plastic.MethodAdvice;
021import org.apache.tapestry5.plastic.MethodInvocation;
022import org.apache.tapestry5.plastic.PlasticClass;
023import org.apache.tapestry5.plastic.PlasticMethod;
024import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
025import org.apache.tapestry5.services.transform.TransformationSupport;
026
027/**
028 * Searches for methods that have the {@link org.apache.tapestry5.hibernate.annotations.CommitAfter} annotation and adds
029 * logic around the method to commit or abort the transaction. The commit/abort logic is the same as for the
030 * {@link org.apache.tapestry5.hibernate.HibernateTransactionDecorator} service.
031 */
032public class CommitAfterWorker implements ComponentClassTransformWorker2
033{
034    private final HibernateSessionManager manager;
035
036    private final MethodAdvice advice = new MethodAdvice()
037    {
038        private void abort()
039        {
040            try
041            {
042                manager.abort();
043            } catch (Exception e)
044            {
045                // Ignore.
046            }
047        }
048
049        public void advise(MethodInvocation invocation)
050        {
051            try
052            {
053                invocation.proceed();
054
055                // Success or checked exception:
056
057                manager.commit();
058            } catch (RuntimeException ex)
059            {
060                abort();
061
062                throw ex;
063            }
064        }
065    };
066
067    public CommitAfterWorker(HibernateSessionManager manager)
068    {
069        this.manager = manager;
070    }
071
072    public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
073    {
074        for (PlasticMethod method : plasticClass.getMethodsWithAnnotation(CommitAfter.class))
075        {
076            method.addAdvice(advice);
077        }
078    }
079}