Publish-subscribe communication

FanoutExchangeSenderDemo.java

package ptos;

import ptop.Sender;

/**
 * rudy
 * 3:15 PM
 * 10/5/17.
 */
public class FanoutExchangeSenderDemo {
    private static final String FANOUT_EXCHANGE_TYPE = "fanout";
    public static void sendToFanoutExchange(String exchange) {
        Sender sender = new Sender();
        sender.initialize();
        sender.send(exchange, FANOUT_EXCHANGE_TYPE, "Test fanout message.");
        sender.destroy();
    }
    public static void main(String[] args) {
        sendToFanoutExchange("pubsub_exchange");
    }
}

PublishSubscribeReceiver.java

package ptos;

import com.rabbitmq.client.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * rudy
 * 2:34 PM
 * 10/5/17.
 */
public class PublishSubscribeReceiver {
    private final static String EXCHANGE_NAME = "pubsub_exchange";
    private final static Logger LOGGER = LoggerFactory.getLogger(PublishSubscribeReceiver.class);
    private Channel channel = null;
    private Connection connection = null;
    String message = null;

    public void initialize() {
        try {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost("localhost");
            connection = factory.newConnection();
            channel = connection.createChannel();
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
        }
    }

    public String receive(String queue) {
        if (channel == null) {
            initialize();
        }

        try {
            channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
            channel.queueDeclare(queue, false, false, false, null);
            channel.queueBind(queue, EXCHANGE_NAME, "");
            Consumer consumer = new DefaultConsumer(channel) {
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                    message = new String(body, "UTF-8");
                    System.out.println(" [x] Received '" + message + "'");
                    LOGGER.debug(message);
                }
            };
            channel.basicConsume(queue, true, consumer);
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
        }
        return message;
    }

    public void destroy() {
        try {
            if (connection != null) {
                connection.close();
            }
        } catch (IOException e) {
            LOGGER.warn(e.getMessage(), e);
        }
    }
}

PublishSubscribeReceiverDemo.java

package ptos;

/**
 * rudy
 * 3:18 PM
 * 10/5/17.
 */
public class PublishSubscribeReceiverDemo {
    public static void main(String[] args) throws InterruptedException {
        final PublishSubscribeReceiver receiver1 = new PublishSubscribeReceiver();
        receiver1.initialize();
        final PublishSubscribeReceiver receiver2 = new PublishSubscribeReceiver();
        receiver2.initialize();

        Thread t1 = new Thread(new Runnable() {
            public void run() {
                receiver1.receive("pubsub_queue1");
            }
        });
        Thread t2 = new Thread(new Runnable() {
            public void run() {
                receiver2.receive("pubsub_queue2");
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();
        receiver1.destroy();
        receiver2.destroy();
    }
}