/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.advisory;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerFilter;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.ProducerBrokerExchange;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Subscription;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.ConnectionId;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.DestinationInfo;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.ProducerId;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.state.ProducerState;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.LongSequenceGenerator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* This broker filter handles tracking the state of the broker for purposes of
* publishing advisory messages to advisory consumers.
*
* @version $Revision$
*/
public class AdvisoryBroker extends BrokerFilter {
private static final Log LOG = LogFactory.getLog(AdvisoryBroker.class);
private static final IdGenerator ID_GENERATOR = new IdGenerator();
protected final ConcurrentHashMap<ConnectionId, ConnectionInfo> connections = new ConcurrentHashMap<ConnectionId, ConnectionInfo>();
protected final ConcurrentHashMap<ConsumerId, ConsumerInfo> consumers = new ConcurrentHashMap<ConsumerId, ConsumerInfo>();
protected final ConcurrentHashMap<ProducerId, ProducerInfo> producers = new ConcurrentHashMap<ProducerId, ProducerInfo>();
protected final ConcurrentHashMap<ActiveMQDestination, DestinationInfo> destinations = new ConcurrentHashMap<ActiveMQDestination, DestinationInfo>();
protected final ProducerId advisoryProducerId = new ProducerId();
private final LongSequenceGenerator messageIdGenerator = new LongSequenceGenerator();
public AdvisoryBroker(Broker next) {
super(next);
advisoryProducerId.setConnectionId(ID_GENERATOR.generateId());
}
public void addConnection(ConnectionContext context, ConnectionInfo info) throws Exception {
next.addConnection(context, info);
ActiveMQTopic topic = AdvisorySupport.getConnectionAdvisoryTopic();
fireAdvisory(context, topic, info);
connections.put(info.getConnectionId(), info);
}
public Subscription addConsumer(ConnectionContext context, ConsumerInfo info) throws Exception {
Subscription answer = next.addConsumer(context, info);
// Don't advise advisory topics.
if (!AdvisorySupport.isAdvisoryTopic(info.getDestination())) {
ActiveMQTopic topic = AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination());
consumers.put(info.getConsumerId(), info);
fireConsumerAdvisory(context, topic, info);
} else {
// We need to replay all the previously collected state objects
// for this newly added consumer.
if (AdvisorySupport.isConnectionAdvisoryTopic(info.getDestination())) {
// Replay the connections.
for (Iterator<ConnectionInfo> iter = connections.values().iterator(); iter.hasNext();) {
ConnectionInfo value = iter.next();
ActiveMQTopic topic = AdvisorySupport.getConnectionAdvisoryTopic();
fireAdvisory(context, topic, value, info.getConsumerId());
}
}
// We need to replay all the previously collected destination
// objects
// for this newly added consumer.
if (AdvisorySupport.isDestinationAdvisoryTopic(info.getDestination())) {
// Replay the destinations.
for (Iterator<DestinationInfo> iter = destinations.values().iterator(); iter.hasNext();) {
DestinationInfo value = iter.next();
ActiveMQTopic topic = AdvisorySupport.getDestinationAdvisoryTopic(value.getDestination());
fireAdvisory(context, topic, value, info.getConsumerId());
}
}
// Replay the producers.
if (AdvisorySupport.isProducerAdvisoryTopic(info.getDestination())) {
for (Iterator<ProducerInfo> iter = producers.values().iterator(); iter.hasNext();) {
ProducerInfo value = iter.next();
ActiveMQTopic topic = AdvisorySupport.getProducerAdvisoryTopic(value.getDestination());
fireProducerAdvisory(context, topic, value, info.getConsumerId());
}
}
// Replay the consumers.
if (AdvisorySupport.isConsumerAdvisoryTopic(info.getDestination())) {
for (Iterator<ConsumerInfo> iter = consumers.values().iterator(); iter.hasNext();) {
ConsumerInfo value = iter.next();
ActiveMQTopic topic = AdvisorySupport.getConsumerAdvisoryTopic(value.getDestination());
fireConsumerAdvisory(context, topic, value, info.getConsumerId());
}
}
}
return answer;
}
public void addProducer(ConnectionContext context, ProducerInfo info) throws Exception {
next.addProducer(context, info);
// Don't advise advisory topics.
if (info.getDestination() != null && !AdvisorySupport.isAdvisoryTopic(info.getDestination())) {
ActiveMQTopic topic = AdvisorySupport.getProducerAdvisoryTopic(info.getDestination());
fireAdvisory(context, topic, info);
producers.put(info.getProducerId(), info);
}
}
public Destination addDestination(ConnectionContext context, ActiveMQDestination destination) throws Exception {
Destination answer = next.addDestination(context, destination);
if (!AdvisorySupport.isAdvisoryTopic(destination)) {
ActiveMQTopic topic = AdvisorySupport.getDestinationAdvisoryTopic(destination);
DestinationInfo info = new DestinationInfo(context.getConnectionId(), DestinationInfo.ADD_OPERATION_TYPE, destination);
fireAdvisory(context, topic, info);
destinations.put(destination, info);
}
return answer;
}
public void addDestinationInfo(ConnectionContext context, DestinationInfo info) throws Exception {
ActiveMQDestination destination = info.getDestination();
next.addDestinationInfo(context, info);
if (!AdvisorySupport.isAdvisoryTopic(destination)) {
ActiveMQTopic topic = AdvisorySupport.getDestinationAdvisoryTopic(destination);
fireAdvisory(context, topic, info);
destinations.put(destination, info);
}
}
public void removeDestination(ConnectionContext context, ActiveMQDestination destination, long timeout) throws Exception {
next.removeDestination(context, destination, timeout);
DestinationInfo info = destinations.remove(destination);
if (info != null) {
info.setDestination(destination);
info.setOperationType(DestinationInfo.REMOVE_OPERATION_TYPE);
ActiveMQTopic topic = AdvisorySupport.getDestinationAdvisoryTopic(destination);
fireAdvisory(context, topic, info);
try {
next.removeDestination(context, AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination()), -1);
} catch (Exception expectedIfDestinationDidNotExistYet) {
}
try {
next.removeDestination(context, AdvisorySupport.getProducerAdvisoryTopic(info.getDestination()), -1);
} catch (Exception expectedIfDestinationDidNotExistYet) {
}
}
}
public void removeDestinationInfo(ConnectionContext context, DestinationInfo destInfo) throws Exception {
next.removeDestinationInfo(context, destInfo);
DestinationInfo info = destinations.remove(destInfo.getDestination());
if (info != null) {
info.setDestination(destInfo.getDestination());
info.setOperationType(DestinationInfo.REMOVE_OPERATION_TYPE);
ActiveMQTopic topic = AdvisorySupport.getDestinationAdvisoryTopic(destInfo.getDestination());
fireAdvisory(context, topic, info);
try {
next.removeDestination(context, AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination()), -1);
} catch (Exception expectedIfDestinationDidNotExistYet) {
}
try {
next.removeDestination(context, AdvisorySupport.getProducerAdvisoryTopic(info.getDestination()), -1);
} catch (Exception expectedIfDestinationDidNotExistYet) {
}
}
}
public void removeConnection(ConnectionContext context, ConnectionInfo info, Throwable error) throws Exception {
next.removeConnection(context, info, error);
ActiveMQTopic topic = AdvisorySupport.getConnectionAdvisoryTopic();
fireAdvisory(context, topic, info.createRemoveCommand());
connections.remove(info.getConnectionId());
}
public void removeConsumer(ConnectionContext context, ConsumerInfo info) throws Exception {
next.removeConsumer(context, info);
// Don't advise advisory topics.
if (!AdvisorySupport.isAdvisoryTopic(info.getDestination())) {
ActiveMQTopic topic = AdvisorySupport.getConsumerAdvisoryTopic(info.getDestination());
consumers.remove(info.getConsumerId());
fireConsumerAdvisory(context, topic, info.createRemoveCommand());
}
}
public void removeProducer(ConnectionContext context, ProducerInfo info) throws Exception {
next.removeProducer(context, info);
// Don't advise advisory topics.
if (info.getDestination() != null && !AdvisorySupport.isAdvisoryTopic(info.getDestination())) {
ActiveMQTopic topic = AdvisorySupport.getProducerAdvisoryTopic(info.getDestination());
producers.remove(info.getProducerId());
fireProducerAdvisory(context, topic, info.createRemoveCommand());
}
}
public void messageExpired(ConnectionContext context, MessageReference messageReference) {
next.messageExpired(context, messageReference);
try {
ActiveMQTopic topic = AdvisorySupport.getExpiredMessageTopic(messageReference.getMessage().getDestination());
fireAdvisory(context, topic, messageReference.getMessage());
} catch (Exception e) {
LOG.warn("Failed to fire message expired advisory");
}
}
protected void fireAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command) throws Exception {
fireAdvisory(context, topic, command, null);
}
protected void fireAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command, ConsumerId targetConsumerId) throws Exception {
ActiveMQMessage advisoryMessage = new ActiveMQMessage();
fireAdvisory(context, topic, command, targetConsumerId, advisoryMessage);
}
protected void fireConsumerAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command) throws Exception {
fireConsumerAdvisory(context, topic, command, null);
}
protected void fireConsumerAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command, ConsumerId targetConsumerId) throws Exception {
ActiveMQMessage advisoryMessage = new ActiveMQMessage();
advisoryMessage.setIntProperty("consumerCount", consumers.size());
fireAdvisory(context, topic, command, targetConsumerId, advisoryMessage);
}
protected void fireProducerAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command) throws Exception {
fireProducerAdvisory(context, topic, command, null);
}
protected void fireProducerAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command, ConsumerId targetConsumerId) throws Exception {
ActiveMQMessage advisoryMessage = new ActiveMQMessage();
advisoryMessage.setIntProperty("producerCount", producers.size());
fireAdvisory(context, topic, command, targetConsumerId, advisoryMessage);
}
protected void fireAdvisory(ConnectionContext context, ActiveMQTopic topic, Command command, ConsumerId targetConsumerId, ActiveMQMessage advisoryMessage) throws Exception {
if (getBrokerService().isStarted()) {
advisoryMessage.setDataStructure(command);
advisoryMessage.setPersistent(false);
advisoryMessage.setType(AdvisorySupport.ADIVSORY_MESSAGE_TYPE);
advisoryMessage.setMessageId(new MessageId(advisoryProducerId, messageIdGenerator.getNextSequenceId()));
advisoryMessage.setTargetConsumerId(targetConsumerId);
advisoryMessage.setDestination(topic);
advisoryMessage.setResponseRequired(false);
advisoryMessage.setProducerId(advisoryProducerId);
boolean originalFlowControl = context.isProducerFlowControl();
final ProducerBrokerExchange producerExchange = new ProducerBrokerExchange();
producerExchange.setConnectionContext(context);
producerExchange.setMutable(true);
producerExchange.setProducerState(new ProducerState(new ProducerInfo()));
try {
context.setProducerFlowControl(false);
next.send(producerExchange, advisoryMessage);
} finally {
context.setProducerFlowControl(originalFlowControl);
}
}
}
}