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.mqtt;
  
  import java.util.concurrent.TimeUnit;
  
  import javax.net.ssl.SSLContext;
  import org.fusesource.mqtt.client.BlockingConnection;
  import org.fusesource.mqtt.client.MQTT;
  import org.fusesource.mqtt.client.Message;
  import org.fusesource.mqtt.client.QoS;
  import org.fusesource.mqtt.client.Topic;
  import static org.fusesource.hawtbuf.UTF8Buffer.utf8;
  
  public class FuseMQTTClientProvider implements MQTTClientProvider {
      private final MQTT mqtt = new MQTT();
      private BlockingConnection connection;
      @Override
      public void connect(String host) throws Exception {
          mqtt.setHost(host);
          // shut off connect retry
          mqtt.setConnectAttemptsMax(0);
          mqtt.setReconnectAttemptsMax(0);
          connection = mqtt.blockingConnection();
          connection.connect();
      }
  
      @Override
      public void disconnect() throws Exception {
          if (this.connection != null){
              this.connection.disconnect();
          }
      }
  
      @Override
      public void publish(String topic, byte[] payload, int qos) throws Exception {
          publish(topic,payload,qos,false);
      }
  
      @Override
      public void publish(String topic, byte[] payload, int qos, boolean retained) throws Exception {
          connection.publish(topic,payload, QoS.values()[qos],retained);
      }
  
      @Override
      public void subscribe(String topic, int qos) throws Exception {
          Topic[] topics = {new Topic(utf8(topic), QoS.values()[qos])};
          connection.subscribe(topics);
      }
  
      @Override
      public void unsubscribe(String topic) throws Exception {
          connection.unsubscribe(new String[]{topic});
      }
  
      @Override
      public byte[] receive(int timeout) throws Exception {
          byte[] result = null;
          Message message = connection.receive(timeout, TimeUnit.MILLISECONDS);
          if (message != null){
              result = message.getPayload();
              message.ack();
          }
          return result;
      }
  
      @Override
      public void setSslContext(SSLContext sslContext) {
          mqtt.setSslContext(sslContext);
      }
  
      @Override
      public void setWillMessage(String string) {
          mqtt.setWillMessage(string);
      }
  
      @Override
      public void setWillTopic(String topic) {
          mqtt.setWillTopic(topic);
      }
  
      @Override
      public void setClientId(String clientId) {
          mqtt.setClientId(clientId);
      }
  
      @Override
      public void kill() throws Exception {
          connection.kill();
      }
  
      @Override
      public void setKeepAlive(int keepAlive) throws Exception {
          mqtt.setKeepAlive((short) keepAlive);
      }
  }
  