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.hibernate.web.internal;
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        @Override
050        public void advise(MethodInvocation invocation)
051        {
052            try
053            {
054                invocation.proceed();
055
056                // Success or checked exception:
057
058                manager.commit();
059            } catch (RuntimeException ex)
060            {
061                abort();
062
063                throw ex;
064            }
065        }
066    };
067
068    public CommitAfterWorker(HibernateSessionManager manager)
069    {
070        this.manager = manager;
071    }
072
073    @Override
074    public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
075    {
076        for (PlasticMethod method : plasticClass.getMethodsWithAnnotation(CommitAfter.class))
077        {
078            method.addAdvice(advice);
079        }
080    }
081}