001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  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    package org.apache.activemq.transport.stomp;
018    
019    import java.io.IOException;
020    
021    import javax.jms.JMSException;
022    
023    import org.apache.activemq.command.ConsumerInfo;
024    import org.apache.activemq.command.MessageAck;
025    import org.apache.activemq.command.MessageDispatch;
026    import org.apache.activemq.command.TransactionId;
027    
028    public class StompQueueBrowserSubscription extends StompSubscription {
029    
030        public StompQueueBrowserSubscription(ProtocolConverter stompTransport, String subscriptionId, ConsumerInfo consumerInfo, String transformation) {
031            super(stompTransport, subscriptionId, consumerInfo, transformation);
032        }
033    
034        @Override
035        void onMessageDispatch(MessageDispatch md) throws IOException, JMSException {
036    
037            if (md.getMessage() != null) {
038                super.onMessageDispatch(md);
039            } else {
040                StompFrame browseDone = new StompFrame(Stomp.Responses.MESSAGE);
041                browseDone.getHeaders().put(Stomp.Headers.Message.SUBSCRIPTION, this.getSubscriptionId());
042                browseDone.getHeaders().put(Stomp.Headers.Message.BROWSER, "end");
043                browseDone.getHeaders().put(Stomp.Headers.Message.DESTINATION,
044                        protocolConverter.findTranslator(null).convertDestination(protocolConverter, this.destination));
045                browseDone.getHeaders().put(Stomp.Headers.Message.MESSAGE_ID, "0");
046    
047                protocolConverter.sendToStomp(browseDone);
048            }
049        }
050    
051        @Override
052        public MessageAck onStompMessageNack(String messageId, TransactionId transactionId) throws ProtocolException {
053            throw new ProtocolException("Cannot Nack a message on a Queue Browser Subscription.");
054        }
055    
056    }