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    import javax.transaction.TransactionManager;
025    
026    /**
027     * An implementation of {@link javax.resource.spi.endpoint.MessageEndpointFactory} which always
028     * uses a single shared instance of a {@link javax.jms.MessageListener} for every endpoint, irrespective
029     * of how many physical endpoints are used.
030     *
031     * @version $Revision: 1.2 $
032     */
033    public class SingletonEndpointFactory extends EndpointFactorySupport implements InitializingBean {
034        private MessageListener messageListener;
035    
036        public SingletonEndpointFactory() {
037        }
038    
039        public SingletonEndpointFactory(MessageListener messageListener) {
040            this.messageListener = messageListener;
041        }
042    
043        public SingletonEndpointFactory(MessageListener messageListener, TransactionManager tm) {
044            this.messageListener = messageListener;
045            this.transactionManager = tm;
046        }
047    
048        public void afterPropertiesSet() throws Exception {
049            if (messageListener == null) {
050                throw new IllegalArgumentException("messageListener property must be set");
051            }
052        }
053    
054        public MessageListener getMessageListener() {
055            return messageListener;
056        }
057    
058        public void setMessageListener(MessageListener messageListener) {
059            this.messageListener = messageListener;
060        }
061    
062        // Implementation methods
063        //-------------------------------------------------------------------------
064        protected MessageListener createMessageListener() throws UnavailableException {
065            return messageListener;
066        }
067    }