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.LocalTransaction; 027 import javax.resource.spi.endpoint.MessageEndpoint; 028 import java.lang.reflect.Method; 029 030 /** 031 * Performs a local transaction while processing the message 032 * 033 * @version $Revision: 1.1.1.1 $ 034 */ 035 public class LocalTransactionEndpoint implements MessageEndpoint, MessageListener { 036 037 private static final Log log = LogFactory.getLog(LocalTransactionEndpoint.class); 038 039 private MessageListener messageListener; 040 private LocalTransaction localTransaction; 041 042 public LocalTransactionEndpoint(MessageListener messageListener, LocalTransaction localTransaction) { 043 this.messageListener = messageListener; 044 this.localTransaction = localTransaction; 045 } 046 047 public void beforeDelivery(Method method) throws NoSuchMethodException, ResourceException { 048 getLocalTransaction().begin(); 049 } 050 051 public void afterDelivery() throws ResourceException { 052 getLocalTransaction().commit(); 053 } 054 055 public void release() { 056 if (localTransaction != null) { 057 try { 058 localTransaction.rollback(); 059 } 060 catch (ResourceException e) { 061 log.warn("Failed to rollback local transaction: " + e, e); 062 } 063 localTransaction = null; 064 } 065 } 066 067 public void onMessage(Message message) { 068 messageListener.onMessage(message); 069 } 070 071 072 /** 073 * A getter which will return the current local transaction or throw a new exception 074 * if this endpoint has already been released. 075 */ 076 protected LocalTransaction getLocalTransaction() throws ResourceException { 077 if (localTransaction == null) { 078 throw new ResourceException("This endpoint has already been released via a call to release() you cannot deliver messages to me"); 079 } 080 return localTransaction; 081 } 082 083 }