001 /** 002 * 003 * Copyright 2005 LogicBlaze, Inc. http://www.logicblaze.com 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.beans.factory.InitializingBean; 021 022 import javax.jms.MessageListener; 023 import javax.resource.spi.UnavailableException; 024 025 /** 026 * An implementation of {@link javax.resource.spi.endpoint.MessageEndpointFactory} which always 027 * uses a single shared instance of a {@link javax.jms.MessageListener} for every endpoint, irrespective 028 * of how many physical endpoints are used. 029 * 030 * @version $Revision: 1.1.1.1 $ 031 */ 032 public class SingletonEndpointFactory extends EndpointFactorySupport implements InitializingBean { 033 private MessageListener messageListener; 034 035 public SingletonEndpointFactory() { 036 } 037 038 public SingletonEndpointFactory(MessageListener messageListener) { 039 this.messageListener = messageListener; 040 } 041 042 public void afterPropertiesSet() throws Exception { 043 if (messageListener == null) { 044 throw new IllegalArgumentException("messageListener property must be set"); 045 } 046 } 047 048 public MessageListener getMessageListener() { 049 return messageListener; 050 } 051 052 public void setMessageListener(MessageListener messageListener) { 053 this.messageListener = messageListener; 054 } 055 056 // Implementation methods 057 //------------------------------------------------------------------------- 058 protected MessageListener createMessageListener() throws UnavailableException { 059 return messageListener; 060 } 061 }