49 lines
1.7 KiB
Java
49 lines
1.7 KiB
Java
import com.rabbitmq.client.*;
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public class RPCServer {
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private static final String RPC_QUEUE_NAME = "rpc_queue";
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private static int fib(int n) {
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if (n == 0) return 0;
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if (n == 1) return 1;
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return fib(n - 1) + fib(n - 2);
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}
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public static void main(String[] argv) throws Exception {
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost("localhost");
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Connection connection = factory.newConnection();
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Channel channel = connection.createChannel();
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channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null);
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channel.queuePurge(RPC_QUEUE_NAME);
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channel.basicQos(1);
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System.out.println(" [x] Awaiting RPC requests");
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DeliverCallback deliverCallback = (consumerTag, delivery) -> {
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AMQP.BasicProperties replyProps = new AMQP.BasicProperties
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.Builder()
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.correlationId(delivery.getProperties().getCorrelationId())
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.build();
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String response = "";
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try {
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String message = new String(delivery.getBody(), "UTF-8");
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int n = Integer.parseInt(message);
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System.out.println(" [.] fib(" + message + ")");
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response += fib(n);
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} catch (RuntimeException e) {
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System.out.println(" [.] " + e);
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} finally {
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channel.basicPublish("", delivery.getProperties().getReplyTo(), replyProps, response.getBytes("UTF-8"));
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channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
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}
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};
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channel.basicConsume(RPC_QUEUE_NAME, false, deliverCallback, (consumerTag -> {}));
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}
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} |