package org.apache.helix.recipes.rabbitmq;
   
   /*
    * 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.
   */
  
  import java.io.IOException;
  
  import com.rabbitmq.client.Channel;
  import com.rabbitmq.client.Connection;
  import com.rabbitmq.client.ConnectionFactory;
  import com.rabbitmq.client.QueueingConsumer;
  
  public class ConsumerThread extends Thread
  {
    private static final String EXCHANGE_NAME = "topic_logs";
    private final String _partition;
    private final String _mqServer;
    private final String _consumerId;
    
    public ConsumerThread(String partition, String mqServer, String consumerId)
    {
      _partition = partition;
      _mqServer = mqServer;
      _consumerId = consumerId;
    }
  
    @Override
    public void run()
    {
      Connection connection = null;
      try
      {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost(_mqServer);
        connection = factory.newConnection();
        Channel channel = connection.createChannel();
  
        channel.exchangeDeclare(EXCHANGE_NAME, "topic");
        String queueName = channel.queueDeclare().getQueue();
  
        String bindingKey = _partition;
        channel.queueBind(queueName, EXCHANGE_NAME, bindingKey);
  
        System.out.println(" [*] " + _consumerId + " Waiting for messages on " + bindingKey + ". To exit press CTRL+C");
  
        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, consumer);
  
        while (true)
        {
          QueueingConsumer.Delivery delivery = consumer.nextDelivery();
          String message = new String(delivery.getBody());
          String routingKey = delivery.getEnvelope().getRoutingKey();
  
          System.out.println(" [x] " + _consumerId + " Received '" + routingKey + "':'" + message + "'");
        }
      } catch (InterruptedException e)
      {
        System.err.println(" [-] " + _consumerId + " on " + _partition + " is interrupted ...");
      }
      catch (Exception e)
      {
        e.printStackTrace();
      } finally
      {
        if (connection != null)
        {
          try
          {
            connection.close();
          } catch (IOException e)
          {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
        }
      }
    }
  }