rabbitmq-tutorials/java/RPCServer.java at main · rabbitmq/rabbitmq-tutorials · GitHub

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import com.rabbitmq.client.*;

import java.util.Map;

public class RPCServer {

private static final String RPC_QUEUE_NAME = "rpc_queue";

private static int fib(int n) {

int a = 0;

int b = 1;

for (int i = 0; i < n; i++) {

int next = a + b;

a = b;

b = next;

}

return a;

}

public static void main(String[] argv) throws Exception {

ConnectionFactory factory = new ConnectionFactory();

factory.setHost("localhost");

Connection connection = factory.newConnection();

Channel channel = connection.createChannel();

channel.queueDeclare(RPC_QUEUE_NAME, true, false, false, Map.of("x-queue-type", "quorum"));

channel.queuePurge(RPC_QUEUE_NAME);

channel.basicQos(1);

System.out.println(" [x] Awaiting RPC requests");

DeliverCallback deliverCallback = (consumerTag, delivery) -> {

AMQP.BasicProperties replyProps = new AMQP.BasicProperties

.Builder()

.correlationId(delivery.getProperties().getCorrelationId())

.build();

String response = "";

try {

String message = new String(delivery.getBody(), "UTF-8");

int n = Integer.parseInt(message);

System.out.println(" [.] fib(" + message + ")");

response += fib(n);

} catch (RuntimeException e) {

System.out.println(" [.] " + e);

} finally {

channel.basicPublish("", delivery.getProperties().getReplyTo(), replyProps, response.getBytes("UTF-8"));

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

}

};

channel.basicConsume(RPC_QUEUE_NAME, false, deliverCallback, (consumerTag -> {}));

}

rabbitmq-tutorials/java/RPCServer.java at main · rabbitmq/rabbitmq-tutorials · GitHub

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