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;
018
019 import javax.jms.JMSException;
020
021 import org.apache.activemq.advisory.AdvisorySupport;
022 import org.apache.activemq.command.ActiveMQDestination;
023 import org.apache.activemq.command.ActiveMQTempDestination;
024 import org.apache.activemq.command.ConsumerId;
025 import org.apache.activemq.command.ConsumerInfo;
026 import org.apache.activemq.command.DataStructure;
027 import org.apache.activemq.command.DestinationInfo;
028 import org.apache.activemq.command.MessageAck;
029 import org.apache.activemq.command.MessageDispatch;
030 import org.slf4j.Logger;
031 import org.slf4j.LoggerFactory;
032
033 public class AdvisoryConsumer implements ActiveMQDispatcher {
034 private static final transient Logger LOG = LoggerFactory.getLogger(AdvisoryConsumer.class);
035
036 int deliveredCounter;
037
038 private final ActiveMQConnection connection;
039 private ConsumerInfo info;
040 private boolean closed;
041
042 public AdvisoryConsumer(ActiveMQConnection connection, ConsumerId consumerId) throws JMSException {
043 this.connection = connection;
044 info = new ConsumerInfo(consumerId);
045 info.setDestination(AdvisorySupport.TEMP_DESTINATION_COMPOSITE_ADVISORY_TOPIC);
046 info.setPrefetchSize(1000);
047 info.setNoLocal(true);
048
049 this.connection.addDispatcher(info.getConsumerId(), this);
050 this.connection.syncSendPacket(this.info);
051 }
052
053 public synchronized void dispose() {
054 if (!closed) {
055 try {
056 this.connection.asyncSendPacket(info.createRemoveCommand());
057 } catch (JMSException e) {
058 LOG.debug("Failed to send remove command: " + e, e);
059 }
060 this.connection.removeDispatcher(info.getConsumerId());
061 closed = true;
062 }
063 }
064
065 public void dispatch(MessageDispatch md) {
066
067 // Auto ack messages when we reach 75% of the prefetch
068 deliveredCounter++;
069 if (deliveredCounter > (0.75 * info.getPrefetchSize())) {
070 try {
071 MessageAck ack = new MessageAck(md, MessageAck.STANDARD_ACK_TYPE, deliveredCounter);
072 connection.asyncSendPacket(ack);
073 deliveredCounter = 0;
074 } catch (JMSException e) {
075 connection.onClientInternalException(e);
076 }
077 }
078
079 DataStructure o = md.getMessage().getDataStructure();
080 if (o != null && o.getClass() == DestinationInfo.class) {
081 processDestinationInfo((DestinationInfo)o);
082 } else {
083 //This can happen across networks
084 if (LOG.isDebugEnabled()) {
085 LOG.debug("Unexpected message was dispatched to the AdvisoryConsumer: "+md);
086 }
087 }
088
089 }
090
091 private void processDestinationInfo(DestinationInfo dinfo) {
092 ActiveMQDestination dest = dinfo.getDestination();
093 if (!dest.isTemporary()) {
094 return;
095 }
096
097 ActiveMQTempDestination tempDest = (ActiveMQTempDestination)dest;
098 if (dinfo.getOperationType() == DestinationInfo.ADD_OPERATION_TYPE) {
099 if (tempDest.getConnection() != null) {
100 tempDest = (ActiveMQTempDestination) tempDest.createDestination(tempDest.getPhysicalName());
101 }
102 connection.activeTempDestinations.put(tempDest, tempDest);
103 } else if (dinfo.getOperationType() == DestinationInfo.REMOVE_OPERATION_TYPE) {
104 connection.activeTempDestinations.remove(tempDest);
105 }
106 }
107
108 }