/**
* 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.transport.mqtt;
import java.io.IOException;
import java.security.cert.X509Certificate;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.jms.JMSException;
import org.apache.activemq.broker.BrokerContext;
import org.apache.activemq.command.Command;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportFilter;
import org.apache.activemq.transport.TransportListener;
import org.apache.activemq.transport.tcp.SslTransport;
import org.apache.activemq.util.IOExceptionSupport;
import org.apache.activemq.wireformat.WireFormat;
import org.fusesource.mqtt.codec.MQTTFrame;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The MQTTTransportFilter normally sits on top of a TcpTransport that has been
* configured with the StompWireFormat and is used to convert MQTT commands to
* ActiveMQ commands. All of the conversion work is done by delegating to the
* MQTTProtocolConverter
*/
public class MQTTTransportFilter extends TransportFilter implements MQTTTransport {
private static final Logger LOG = LoggerFactory.getLogger(MQTTTransportFilter.class);
private static final Logger TRACE = LoggerFactory.getLogger(MQTTTransportFilter.class.getPackage().getName() + ".MQTTIO");
private final MQTTProtocolConverter protocolConverter;
private MQTTInactivityMonitor monitor;
private MQTTWireFormat wireFormat;
private final AtomicBoolean stopped = new AtomicBoolean();
private boolean trace;
public MQTTTransportFilter(Transport next, WireFormat wireFormat, BrokerContext brokerContext) {
super(next);
this.protocolConverter = new MQTTProtocolConverter(this, brokerContext);
if (wireFormat instanceof MQTTWireFormat) {
this.wireFormat = (MQTTWireFormat) wireFormat;
}
}
public void oneway(Object o) throws IOException {
try {
final Command command = (Command) o;
protocolConverter.onActiveMQCommand(command);
} catch (Exception e) {
throw IOExceptionSupport.create(e);
}
}
public void onCommand(Object command) {
try {
if (trace) {
TRACE.trace("Received: \n" + command);
}
protocolConverter.onMQTTCommand((MQTTFrame) command);
} catch (IOException e) {
handleException(e);
} catch (JMSException e) {
onException(IOExceptionSupport.create(e));
}
}
public void sendToActiveMQ(Command command) {
TransportListener l = transportListener;
if (l != null) {
l.onCommand(command);
}
}
public void sendToMQTT(MQTTFrame command) throws IOException {
if( !stopped.get() ) {
if (trace) {
TRACE.trace("Sending: \n" + command);
}
Transport n = next;
if (n != null) {
n.oneway(command);
}
}
}
@Override
public void stop() throws Exception {
if( stopped.compareAndSet(false, true) ) {
super.stop();
}
}
public X509Certificate[] getPeerCertificates() {
if (next instanceof SslTransport) {
X509Certificate[] peerCerts = ((SslTransport) next).getPeerCertificates();
if (trace && peerCerts != null) {
LOG.debug("Peer Identity has been verified\n");
}
return peerCerts;
}
return null;
}
public boolean isTrace() {
return trace;
}
public void setTrace(boolean trace) {
this.trace = trace;
}
@Override
public MQTTInactivityMonitor getInactivityMonitor() {
return monitor;
}
public void setInactivityMonitor(MQTTInactivityMonitor monitor) {
this.monitor = monitor;
}
@Override
public MQTTWireFormat getWireFormat() {
return this.wireFormat;
}
public void handleException(IOException e) {
protocolConverter.onTransportError();
super.onException(e);
}
public long getDefaultKeepAlive() {
return protocolConverter != null ? protocolConverter.getDefaultKeepAlive() : -1;
}
public void setDefaultKeepAlive(long defaultHeartBeat) {
protocolConverter.setDefaultKeepAlive(defaultHeartBeat);
}
public int getActiveMQSubscriptionPrefetch() {
return protocolConverter.getActiveMQSubscriptionPrefetch();
}
/**
* set the default prefetch size when mapping the MQTT subscription to an ActiveMQ one
* The default = 1
* @param activeMQSubscriptionPrefetch set the prefetch for the corresponding ActiveMQ subscription
*/
public void setActiveMQSubscriptionPrefetch(int activeMQSubscriptionPrefetch) {
protocolConverter.setActiveMQSubscriptionPrefetch(activeMQSubscriptionPrefetch);
}
}