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.springframework.aop.TargetSource; 021 import org.springframework.beans.factory.InitializingBean; 022 023 import javax.jms.Message; 024 import javax.jms.MessageListener; 025 026 /** 027 * Represents a pool of MessageListener instances using Spring's 028 * TargetSource for the underlying pool. 029 * 030 * @version $Revision: 1.1.1.1 $ 031 */ 032 public class TargetSourceMessageListener implements MessageListener, InitializingBean { 033 private TargetSource targetSource; 034 035 public void onMessage(Message message) { 036 MessageListener delegate = null; 037 try { 038 delegate = (MessageListener) targetSource.getTarget(); 039 } 040 catch (Exception e) { 041 handleException(e); 042 } 043 try { 044 delegate.onMessage(message); 045 } 046 finally { 047 try { 048 targetSource.releaseTarget(delegate); 049 } 050 catch (Exception e) { 051 handleException(e); 052 } 053 } 054 } 055 056 public void afterPropertiesSet() throws Exception { 057 if (targetSource == null) { 058 throw new IllegalArgumentException("targetSource must be set"); 059 } 060 } 061 062 public TargetSource getTargetSource() { 063 return targetSource; 064 } 065 066 public void setTargetSource(TargetSource targetSource) { 067 this.targetSource = targetSource; 068 } 069 070 protected void handleException(Exception e) { 071 throw new RuntimeException(e); 072 } 073 074 }