/**
* 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.ws.jetty9;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.activemq.transport.ws.AbstractMQTTSocket;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.util.IOExceptionSupport;
import org.eclipse.jetty.websocket.api.Session;
import org.eclipse.jetty.websocket.api.WebSocketListener;
import org.fusesource.mqtt.codec.DISCONNECT;
import org.fusesource.mqtt.codec.MQTTFrame;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MQTTSocket extends AbstractMQTTSocket implements WebSocketListener {
private static final Logger LOG = LoggerFactory.getLogger(MQTTSocket.class);
private final int ORDERLY_CLOSE_TIMEOUT = 10;
private Session session;
final AtomicBoolean receivedDisconnect = new AtomicBoolean();
public MQTTSocket(String remoteAddress) {
super(remoteAddress);
}
@Override
public void sendToMQTT(MQTTFrame command) throws IOException {
ByteSequence bytes = wireFormat.marshal(command);
try {
//timeout after a period of time so we don't wait forever and hold the protocol lock
session.getRemote().sendBytesByFuture(
ByteBuffer.wrap(bytes.getData(), 0, bytes.getLength())).get(getDefaultSendTimeOut(), TimeUnit.SECONDS);
} catch (Exception e) {
throw IOExceptionSupport.create(e);
}
}
@Override
public void handleStopped() throws IOException {
if (session != null && session.isOpen()) {
session.close();
}
}
//----- WebSocket.OnTextMessage callback handlers ------------------------//
@Override
public void onWebSocketBinary(byte[] bytes, int offset, int length) {
if (!transportStartedAtLeastOnce()) {
LOG.debug("Waiting for MQTTSocket to be properly started...");
try {
socketTransportStarted.await();
} catch (InterruptedException e) {
LOG.warn("While waiting for MQTTSocket to be properly started, we got interrupted!! Should be okay, but you could see race conditions...");
}
}
protocolLock.lock();
try {
receiveCounter += length;
MQTTFrame frame = (MQTTFrame)wireFormat.unmarshal(new ByteSequence(bytes, offset, length));
if (frame.messageType() == DISCONNECT.TYPE) {
receivedDisconnect.set(true);
}
getProtocolConverter().onMQTTCommand(frame);
} catch (Exception e) {
onException(IOExceptionSupport.create(e));
} finally {
protocolLock.unlock();
}
}
@Override
public void onWebSocketClose(int arg0, String arg1) {
try {
if (protocolLock.tryLock() || protocolLock.tryLock(ORDERLY_CLOSE_TIMEOUT, TimeUnit.SECONDS)) {
LOG.debug("MQTT WebSocket closed: code[{}] message[{}]", arg0, arg1);
//Check if we received a disconnect packet before closing
if (!receivedDisconnect.get()) {
getProtocolConverter().onTransportError();
}
getProtocolConverter().onMQTTCommand(new DISCONNECT().encode());
}
} catch (Exception e) {
LOG.debug("Failed to close MQTT WebSocket cleanly", e);
} finally {
if (protocolLock.isHeldByCurrentThread()) {
protocolLock.unlock();
}
}
}
@Override
public void onWebSocketConnect(Session session) {
this.session = session;
}
@Override
public void onWebSocketError(Throwable arg0) {
}
@Override
public void onWebSocketText(String arg0) {
}
private static int getDefaultSendTimeOut() {
return Integer.getInteger("org.apache.activemq.transport.ws.MQTTSocket.sendTimeout", 30);
}
}