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    
015    package org.apache.tapestry5.internal.hibernate;
016    
017    import org.apache.tapestry5.hibernate.HibernateSessionManager;
018    import org.apache.tapestry5.hibernate.annotations.CommitAfter;
019    import org.apache.tapestry5.model.MutableComponentModel;
020    import org.apache.tapestry5.plastic.MethodAdvice;
021    import org.apache.tapestry5.plastic.MethodInvocation;
022    import org.apache.tapestry5.plastic.PlasticClass;
023    import org.apache.tapestry5.plastic.PlasticMethod;
024    import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
025    import 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     */
032    public 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    }