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 javax.jms.JMSException;
021    import javax.jms.Message;
022    import javax.jms.MessageListener;
023    import javax.resource.ResourceException;
024    import javax.resource.spi.endpoint.MessageEndpoint;
025    import java.lang.reflect.Method;
026    
027    /**
028     * An endpoint which uses a JMS {@link javax.jms.Message#acknowledge()} to
029     * acknowledge that a message is delivered.
030     *
031     * @version $Revision: 1.1.1.1 $
032     */
033    public class AcknowledgeEndpoint implements MessageEndpoint, MessageListener {
034    
035        private MessageListener messageListener;
036        private Message message;
037    
038        public AcknowledgeEndpoint(MessageListener messageListener) {
039            this.messageListener = messageListener;
040        }
041    
042        public void beforeDelivery(Method method) throws NoSuchMethodException, ResourceException {
043        }
044    
045        public void afterDelivery() throws ResourceException {
046            if (message == null) {
047                throw new ResourceException("No message has been delivered yet");
048            }
049            try {
050                message.acknowledge();
051            }
052            catch (JMSException e) {
053                throw new ResourceException(e);
054            }
055            finally {
056                message = null;
057            }
058        }
059    
060        public void release() {
061        }
062    
063        public void onMessage(Message message) {
064            messageListener.onMessage(message);
065            this.message = message;
066        }
067    }