org.apache.helix.recipes.rabbitmq.ConsumerThread.java Source code

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Here is the source code for org.apache.helix.recipes.rabbitmq.ConsumerThread.java

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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 org.apache.helix.api.id.ParticipantId;
import org.apache.helix.api.id.PartitionId;

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 PartitionId _partition;
    private final String _mqServer;
    private final ParticipantId _consumerId;

    public ConsumerThread(PartitionId partition, String mqServer, ParticipantId 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.toString();
            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();
                }
            }
        }
    }
}