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/**
* 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.network;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.activemq.Service;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.command.BrokerId;
import org.apache.activemq.command.BrokerInfo;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.ConnectionId;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.ExceptionResponse;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageDispatch;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.command.Response;
import org.apache.activemq.command.SessionInfo;
import org.apache.activemq.command.ShutdownInfo;
import org.apache.activemq.transport.DefaultTransportListener;
import org.apache.activemq.transport.FutureResponse;
import org.apache.activemq.transport.ResponseCallback;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.ServiceStopper;
import org.apache.activemq.util.ServiceSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Forwards all messages from the local broker to the remote broker.
*
* @org.apache.xbean.XBean
*
*/
public class ForwardingBridge implements Service {
private static final IdGenerator ID_GENERATOR = new IdGenerator();
private static final Logger LOG = LoggerFactory.getLogger(ForwardingBridge.class);
final AtomicLong enqueueCounter = new AtomicLong();
final AtomicLong dequeueCounter = new AtomicLong();
ConnectionInfo connectionInfo;
SessionInfo sessionInfo;
ProducerInfo producerInfo;
ConsumerInfo queueConsumerInfo;
ConsumerInfo topicConsumerInfo;
BrokerId localBrokerId;
BrokerId remoteBrokerId;
BrokerInfo localBrokerInfo;
BrokerInfo remoteBrokerInfo;
private final Transport localBroker;
private final Transport remoteBroker;
private String clientId;
private int prefetchSize = 1000;
private boolean dispatchAsync;
private String destinationFilter = ">";
private NetworkBridgeListener bridgeFailedListener;
private boolean useCompression = false;
public ForwardingBridge(Transport localBroker, Transport remoteBroker) {
this.localBroker = localBroker;
this.remoteBroker = remoteBroker;
}
public void start() throws Exception {
LOG.info("Starting a network connection between {} and {} has been established.", localBroker, remoteBroker);
localBroker.setTransportListener(new DefaultTransportListener() {
public void onCommand(Object o) {
Command command = (Command)o;
serviceLocalCommand(command);
}
public void onException(IOException error) {
serviceLocalException(error);
}
});
remoteBroker.setTransportListener(new DefaultTransportListener() {
public void onCommand(Object o) {
Command command = (Command)o;
serviceRemoteCommand(command);
}
public void onException(IOException error) {
serviceRemoteException(error);
}
});
localBroker.start();
remoteBroker.start();
}
protected void triggerStartBridge() throws IOException {
Thread thead = new Thread() {
public void run() {
try {
startBridge();
} catch (IOException e) {
LOG.error("Failed to start network bridge: ", e);
}
}
};
thead.start();
}
/**
* @throws IOException
*/
final void startBridge() throws IOException {
connectionInfo = new ConnectionInfo();
connectionInfo.setConnectionId(new ConnectionId(ID_GENERATOR.generateId()));
connectionInfo.setClientId(clientId);
localBroker.oneway(connectionInfo);
remoteBroker.oneway(connectionInfo);
sessionInfo = new SessionInfo(connectionInfo, 1);
localBroker.oneway(sessionInfo);
remoteBroker.oneway(sessionInfo);
queueConsumerInfo = new ConsumerInfo(sessionInfo, 1);
queueConsumerInfo.setDispatchAsync(dispatchAsync);
queueConsumerInfo.setDestination(new ActiveMQQueue(destinationFilter));
queueConsumerInfo.setPrefetchSize(prefetchSize);
queueConsumerInfo.setPriority(ConsumerInfo.NETWORK_CONSUMER_PRIORITY);
localBroker.oneway(queueConsumerInfo);
producerInfo = new ProducerInfo(sessionInfo, 1);
producerInfo.setResponseRequired(false);
remoteBroker.oneway(producerInfo);
if (connectionInfo.getClientId() != null) {
topicConsumerInfo = new ConsumerInfo(sessionInfo, 2);
topicConsumerInfo.setDispatchAsync(dispatchAsync);
topicConsumerInfo.setSubscriptionName("topic-bridge");
topicConsumerInfo.setRetroactive(true);
topicConsumerInfo.setDestination(new ActiveMQTopic(destinationFilter));
topicConsumerInfo.setPrefetchSize(prefetchSize);
topicConsumerInfo.setPriority(ConsumerInfo.NETWORK_CONSUMER_PRIORITY);
localBroker.oneway(topicConsumerInfo);
}
LOG.info("Network connection between {} and {} has been established.", localBroker, remoteBroker);
}
public void stop() throws Exception {
try {
if (connectionInfo != null) {
localBroker.request(connectionInfo.createRemoveCommand());
remoteBroker.request(connectionInfo.createRemoveCommand());
}
localBroker.setTransportListener(null);
remoteBroker.setTransportListener(null);
localBroker.oneway(new ShutdownInfo());
remoteBroker.oneway(new ShutdownInfo());
} finally {
ServiceStopper ss = new ServiceStopper();
ss.stop(localBroker);
ss.stop(remoteBroker);
ss.throwFirstException();
}
}
public void serviceRemoteException(Throwable error) {
LOG.info("Unexpected remote exception: {}", error.getMessage());
LOG.debug("Exception trace: ", error);
}
protected void serviceRemoteCommand(Command command) {
try {
if (command.isBrokerInfo()) {
synchronized (this) {
remoteBrokerInfo = (BrokerInfo)command;
remoteBrokerId = remoteBrokerInfo.getBrokerId();
if (localBrokerId != null) {
if (localBrokerId.equals(remoteBrokerId)) {
LOG.info("Disconnecting loop back connection.");
ServiceSupport.dispose(this);
} else {
triggerStartBridge();
}
}
}
} else {
LOG.warn("Unexpected remote command: {}", command);
}
} catch (IOException e) {
serviceLocalException(e);
}
}
public void serviceLocalException(Throwable error) {
LOG.info("Unexpected local exception: {}", error.getMessage());
LOG.debug("Exception trace: ", error);
fireBridgeFailed();
}
protected void serviceLocalCommand(Command command) {
try {
if (command.isMessageDispatch()) {
enqueueCounter.incrementAndGet();
final MessageDispatch md = (MessageDispatch)command;
Message message = md.getMessage();
message.setProducerId(producerInfo.getProducerId());
if (message.getOriginalTransactionId() == null) {
message.setOriginalTransactionId(message.getTransactionId());
}
message.setTransactionId(null);
if (isUseCompression()) {
message.compress();
}
if (!message.isResponseRequired()) {
// If the message was originally sent using async send, we will preserve that
// QOS by bridging it using an async send (small chance of message loss).
remoteBroker.oneway(message);
dequeueCounter.incrementAndGet();
localBroker.oneway(new MessageAck(md, MessageAck.STANDARD_ACK_TYPE, 1));
} else {
// The message was not sent using async send, so we should
// only ack the local
// broker when we get confirmation that the remote broker
// has received the message.
ResponseCallback callback = new ResponseCallback() {
public void onCompletion(FutureResponse future) {
try {
Response response = future.getResult();
if (response.isException()) {
ExceptionResponse er = (ExceptionResponse)response;
serviceLocalException(er.getException());
} else {
dequeueCounter.incrementAndGet();
localBroker.oneway(new MessageAck(md, MessageAck.STANDARD_ACK_TYPE, 1));
}
} catch (IOException e) {
serviceLocalException(e);
}
}
};
remoteBroker.asyncRequest(message, callback);
}
// Ack on every message since we don't know if the broker is
// blocked due to memory
// usage and is waiting for an Ack to un-block him.
// Acking a range is more efficient, but also more prone to
// locking up a server
// Perhaps doing something like the following should be policy
// based.
// if(
// md.getConsumerId().equals(queueConsumerInfo.getConsumerId())
// ) {
// queueDispatched++;
// if( queueDispatched > (queueConsumerInfo.getPrefetchSize()/2)
// ) {
// localBroker.oneway(new MessageAck(md,
// MessageAck.STANDARD_ACK_TYPE, queueDispatched));
// queueDispatched=0;
// }
// } else {
// topicDispatched++;
// if( topicDispatched > (topicConsumerInfo.getPrefetchSize()/2)
// ) {
// localBroker.oneway(new MessageAck(md,
// MessageAck.STANDARD_ACK_TYPE, topicDispatched));
// topicDispatched=0;
// }
// }
} else if (command.isBrokerInfo()) {
synchronized (this) {
localBrokerInfo = (BrokerInfo)command;
localBrokerId = localBrokerInfo.getBrokerId();
if (remoteBrokerId != null) {
if (remoteBrokerId.equals(localBrokerId)) {
LOG.info("Disconnecting loop back connection.");
ServiceSupport.dispose(this);
} else {
triggerStartBridge();
}
}
}
} else {
LOG.debug("Unexpected local command: {}", command);
}
} catch (IOException e) {
serviceLocalException(e);
}
}
public String getClientId() {
return clientId;
}
public void setClientId(String clientId) {
this.clientId = clientId;
}
public int getPrefetchSize() {
return prefetchSize;
}
public void setPrefetchSize(int prefetchSize) {
this.prefetchSize = prefetchSize;
}
public boolean isDispatchAsync() {
return dispatchAsync;
}
public void setDispatchAsync(boolean dispatchAsync) {
this.dispatchAsync = dispatchAsync;
}
public String getDestinationFilter() {
return destinationFilter;
}
public void setDestinationFilter(String destinationFilter) {
this.destinationFilter = destinationFilter;
}
public void setNetworkBridgeFailedListener(NetworkBridgeListener listener) {
this.bridgeFailedListener = listener;
}
private void fireBridgeFailed() {
NetworkBridgeListener l = this.bridgeFailedListener;
if (l != null) {
l.bridgeFailed();
}
}
public String getRemoteAddress() {
return remoteBroker.getRemoteAddress();
}
public String getLocalAddress() {
return localBroker.getRemoteAddress();
}
public String getLocalBrokerName() {
return localBrokerInfo == null ? null : localBrokerInfo.getBrokerName();
}
public String getRemoteBrokerName() {
return remoteBrokerInfo == null ? null : remoteBrokerInfo.getBrokerName();
}
public long getDequeueCounter() {
return dequeueCounter.get();
}
public long getEnqueueCounter() {
return enqueueCounter.get();
}
/**
* @param useCompression
* True if forwarded Messages should have their bodies compressed.
*/
public void setUseCompression(boolean useCompression) {
this.useCompression = useCompression;
}
/**
* @return the vale of the useCompression setting, true if forwarded messages will be compressed.
*/
public boolean isUseCompression() {
return useCompression;
}
}
