localdomain.localhost.RabbitMQClient.java Source code

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Here is the source code for localdomain.localhost.RabbitMQClient.java

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/*
 * Copyright 2010-2014, the original author or authors
 *
 * Licensed 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 localdomain.localhost;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

@WebServlet(value = "/rabbitmq/client")
public class RabbitMQClient extends HttpServlet {

    private final static String QUEUE_NAME = "myqueue";

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        try {
            ConnectionFactory factory = new ConnectionFactory();
            String messages = new String();

            String uri = System.getProperty("CLOUDAMQP_URL");
            factory.setUri(uri);

            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();

            channel.queueDeclare(QUEUE_NAME, true, false, false, null);

            QueueingConsumer consumer = new QueueingConsumer(channel);

            boolean autoACK = false;
            channel.basicConsume(QUEUE_NAME, autoACK, consumer);

            System.out.println(" [*] Waiting 100ms for a message");
            QueueingConsumer.Delivery delivery = consumer.nextDelivery(100);

            while (delivery != null) {
                String message = new String(delivery.getBody());

                System.out.println(" [x] Received '" + message + "'");

                channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);

                messages = message + " <br/> " + messages;
                delivery = consumer.nextDelivery(100);
            }
            request.setAttribute("messages", messages);
            request.getRequestDispatcher("/index.jsp").forward(request, response);

            channel.close();
            connection.close();

        } catch (Exception e) {
            request.setAttribute("throwable", e);
            request.getRequestDispatcher("/index.jsp").forward(request, response);
        }

    }

}