Java tutorial
/** * This file is part of rabbitmq-examples. * * rabbitmq-examples is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2, or (at your option) any later version. * * rabbitmq-examples is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program; see the file COPYING. If not, see * <http://www.gnu.org/licenses/>. */ package es.devcircus.rabbitmq_examples.rabbitmq_rpc; import com.rabbitmq.client.ConnectionFactory; import com.rabbitmq.client.Connection; import com.rabbitmq.client.Channel; import com.rabbitmq.client.QueueingConsumer; import com.rabbitmq.client.AMQP.BasicProperties; import com.rabbitmq.client.ConsumerCancelledException; import com.rabbitmq.client.ShutdownSignalException; import java.io.IOException; import java.security.KeyManagementException; import java.security.NoSuchAlgorithmException; import java.util.logging.Level; import java.util.logging.Logger; /** * @author Adrian Novegil Toledo * @mail adrian.novegil@gmail.com * @description */ public class RPCServer { private static final String RPC_QUEUE_NAME = "rpc_queue"; /** * * @param n * @return */ private static int fib(int n) { if (n == 0) { return 0; } if (n == 1) { return 1; } return fib(n - 1) + fib(n - 2); } /** * * @param argv */ public static void main(String[] argv) { Connection connection = null; Channel channel = null; try { ConnectionFactory factory = new ConnectionFactory(); // factory.setHost("localhost"); factory.setHost("192.168.0.202"); // factory.setPort(5671); // factory.useSslProtocol(); connection = factory.newConnection(); channel = connection.createChannel(); channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null); channel.basicQos(1); QueueingConsumer consumer = new QueueingConsumer(channel); channel.basicConsume(RPC_QUEUE_NAME, false, consumer); System.out.println(" [x] Awaiting RPC requests"); while (true) { String response = null; QueueingConsumer.Delivery delivery = consumer.nextDelivery(); BasicProperties props = delivery.getProperties(); BasicProperties replyProps = new BasicProperties.Builder().correlationId(props.getCorrelationId()) .build(); try { String message = new String(delivery.getBody(), "UTF-8"); int n = Integer.parseInt(message); System.out.println(" [.] fib(" + message + ")"); response = "" + fib(n); } catch (Exception e) { System.out.println(" [.] " + e.toString()); response = ""; } finally { channel.basicPublish("", props.getReplyTo(), replyProps, response.getBytes("UTF-8")); channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false); } } } catch (IOException | InterruptedException | ShutdownSignalException | ConsumerCancelledException e) { System.out.println(e.toString()); } finally { if (connection != null) { try { connection.close(); } catch (Exception ignore) { } } } } }