org.sdw.scheduler.QueueProcessor.java Source code

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Here is the source code for org.sdw.scheduler.QueueProcessor.java

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/*******************************************************************************
 * 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.sdw.scheduler;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.ConsumerCancelledException;
import com.rabbitmq.client.QueueingConsumer;
import com.rabbitmq.client.ShutdownSignalException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.URISyntaxException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Ritesh Kumar Singh
 *
 */
public class QueueProcessor implements Runnable {
    public final static Logger LOG = LoggerFactory.getLogger(QueueProcessor.class);

    /**
     * Default constructor for initialization purpose
     */
    public QueueProcessor() {

    }

    /**
     * Implementation of the Runnable interface's run method
     * Polls for messages in the shared queue and logs the results on arrival of message
     */
    @Override
    public void run() {
        try {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setUri(System.getenv("CLOUDAMQP_URL"));
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();
            String queueName = "work-queue-1";
            Map<String, Object> params = new HashMap<>();
            params.put("x-ha-policy", "all");
            channel.queueDeclare(queueName, true, false, false, params);
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(queueName, false, consumer);

            while (true) {
                QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                if (delivery != null) {
                    String msg = new String(delivery.getBody(), "UTF-8");
                    LOG.info("Message Received: " + msg);
                    channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
                }
            }
        } catch (IOException | KeyManagementException | NoSuchAlgorithmException | URISyntaxException
                | ShutdownSignalException | ConsumerCancelledException | InterruptedException ex) {
            LOG.error(ex.getMessage(), ex);
        }
    }

}