001 /**
002 *
003 * Copyright 2005 LogicBlaze, Inc.
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 *
017 **/
018 package org.jencks;
019
020 import org.apache.commons.logging.Log;
021 import org.apache.commons.logging.LogFactory;
022
023 import javax.jms.Message;
024 import javax.jms.MessageListener;
025 import javax.resource.ResourceException;
026 import javax.resource.spi.endpoint.MessageEndpoint;
027 import javax.transaction.HeuristicMixedException;
028 import javax.transaction.HeuristicRollbackException;
029 import javax.transaction.NotSupportedException;
030 import javax.transaction.RollbackException;
031 import javax.transaction.SystemException;
032 import javax.transaction.Transaction;
033 import javax.transaction.TransactionManager;
034 import javax.transaction.xa.XAResource;
035 import java.lang.reflect.Method;
036
037 /**
038 * An XA based Endpoint which uses an XA transaction per message delivery.
039 *
040 * @version $Revision: 1.2 $
041 */
042 public class XAEndpoint implements MessageEndpoint, MessageListener {
043 private static final Log log = LogFactory.getLog(XAEndpoint.class);
044
045 private MessageListener messageListener;
046 private XAResource xaResource;
047 private TransactionManager transactionManager;
048 private Transaction transaction;
049 private boolean beforeDeliveryCompleted;
050 private boolean messageDelivered;
051
052 public XAEndpoint(MessageListener messageListener, XAResource xaResource, TransactionManager transactionManager) {
053 this.messageListener = messageListener;
054 this.xaResource = xaResource;
055 this.transactionManager = transactionManager;
056 }
057
058 public void beforeDelivery(Method method) throws NoSuchMethodException, ResourceException {
059 if (transaction != null) {
060 throw new IllegalStateException("Transaction still in progress");
061 }
062 beforeDeliveryCompleted = false;
063 try {
064 transactionManager.begin();
065 transaction = transactionManager.getTransaction();
066
067 transaction.enlistResource(xaResource);
068 beforeDeliveryCompleted = true;
069
070 log.trace("Transaction started and resource enlisted");
071 }
072 catch (NotSupportedException e) {
073 System.out.println("Caught: " + e);
074 throw new ResourceException(e);
075 }
076 catch (SystemException e) {
077 System.out.println("Caught: " + e);
078 throw new ResourceException(e);
079 }
080 catch (RollbackException e) {
081 System.out.println("Caught: " + e);
082 throw new ResourceException(e);
083 }
084 catch (Throwable e) {
085 System.out.println("Caught: " + e);
086 e.printStackTrace();
087 throw new ResourceException(e);
088 }
089 }
090
091 public void afterDelivery() throws ResourceException {
092 if (transaction == null) {
093 throw new IllegalStateException("Transaction not in progress");
094 }
095 if (beforeDeliveryCompleted && messageDelivered) {
096 try {
097 transaction.delistResource(xaResource, XAResource.TMSUSPEND);
098 }
099 catch (SystemException e) {
100 throw new ResourceException(e);
101 }
102 try {
103 transaction.commit();
104 log.trace("Transaction committed");
105 }
106 catch (RollbackException e) {
107 throw new ResourceException(e);
108 }
109 catch (HeuristicMixedException e) {
110 doRollback(e);
111 }
112 catch (HeuristicRollbackException e) {
113 doRollback(e);
114 }
115 catch (SystemException e) {
116 doRollback(e);
117 }
118 finally {
119 transaction = null;
120 }
121 }
122 }
123
124 public void onMessage(Message message) {
125 messageDelivered = false;
126 messageListener.onMessage(message);
127 messageDelivered = true;
128 }
129
130 public void release() {
131 if (transaction != null) {
132 try {
133 transaction.rollback();
134 }
135 catch (SystemException e) {
136 log.warn("Failed to rollback transaction: " + e, e);
137 }
138 }
139 }
140
141 protected void doRollback(Exception e) throws ResourceException {
142 try {
143 transaction.rollback();
144 log.trace("Transaction rolled back");
145 }
146 catch (SystemException e1) {
147 log.warn("Caught exception while rolling back: " + e1, e1);
148 }
149 transaction = null;
150 throw new ResourceException(e);
151 }
152 }