content: /**
   * 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.jetty11;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.time.Duration;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.activemq.transport.mqtt.MQTTCodec;
  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.hawtbuf.Buffer;
  import org.fusesource.hawtbuf.DataByteArrayInputStream;
  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 MQTTCodec.MQTTFrameSink, WebSocketListener {
  
      private static final Logger LOG = LoggerFactory.getLogger(MQTTSocket.class);
  
      private final int ORDERLY_CLOSE_TIMEOUT = 10;
      private Session session;
      private final AtomicBoolean receivedDisconnect = new AtomicBoolean();
  
      private final MQTTCodec codec;
  
      public MQTTSocket(String remoteAddress) {
          super(remoteAddress);
  
          this.codec = new MQTTCodec(this, getWireFormat());
      }
  
      @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
              // FIXME: convert to async .get(getDefaultSendTimeOut(), TimeUnit.SECONDS)
              session.getRemote().sendBytes(ByteBuffer.wrap(bytes.getData(), 0, bytes.getLength()));
          } 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;
              codec.parse(new DataByteArrayInputStream(new Buffer(bytes, offset, length)), length);
          } 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;
          this.session.setIdleTimeout(Duration.ZERO);
      }
  
      @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);
      }
  
      //----- MQTTCodec Frame Sink event point ---------------------------------//
  
      @Override
      public void onFrame(MQTTFrame mqttFrame) {
          try {
              if (mqttFrame.messageType() == DISCONNECT.TYPE) {
                  receivedDisconnect.set(true);
              }
              getProtocolConverter().onMQTTCommand(mqttFrame);
          } catch (Exception e) {
              onException(IOExceptionSupport.create(e));
          }
      }
  }
  