1 /*** 2 * 3 * Copyright 2005 LogicBlaze, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 package org.jencks; 19 20 import org.apache.commons.logging.Log; 21 import org.apache.commons.logging.LogFactory; 22 23 import javax.jms.Message; 24 import javax.jms.MessageListener; 25 import javax.resource.ResourceException; 26 import javax.resource.spi.LocalTransaction; 27 import javax.resource.spi.endpoint.MessageEndpoint; 28 import java.lang.reflect.Method; 29 30 /*** 31 * Performs a local transaction while processing the message 32 * 33 * @version $Revision: 1.1.1.1 $ 34 */ 35 public class LocalTransactionEndpoint implements MessageEndpoint, MessageListener { 36 37 private static final Log log = LogFactory.getLog(LocalTransactionEndpoint.class); 38 39 private MessageListener messageListener; 40 private LocalTransaction localTransaction; 41 42 public LocalTransactionEndpoint(MessageListener messageListener, LocalTransaction localTransaction) { 43 this.messageListener = messageListener; 44 this.localTransaction = localTransaction; 45 } 46 47 public void beforeDelivery(Method method) throws NoSuchMethodException, ResourceException { 48 getLocalTransaction().begin(); 49 } 50 51 public void afterDelivery() throws ResourceException { 52 getLocalTransaction().commit(); 53 } 54 55 public void release() { 56 if (localTransaction != null) { 57 try { 58 localTransaction.rollback(); 59 } 60 catch (ResourceException e) { 61 log.warn("Failed to rollback local transaction: " + e, e); 62 } 63 localTransaction = null; 64 } 65 } 66 67 public void onMessage(Message message) { 68 messageListener.onMessage(message); 69 } 70 71 72 /*** 73 * A getter which will return the current local transaction or throw a new exception 74 * if this endpoint has already been released. 75 */ 76 protected LocalTransaction getLocalTransaction() throws ResourceException { 77 if (localTransaction == null) { 78 throw new ResourceException("This endpoint has already been released via a call to release() you cannot deliver messages to me"); 79 } 80 return localTransaction; 81 } 82 83 }