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    }