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Simplified RPC examples

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This commit is contained in:
Michel Lammertink 2022-09-20 19:28:25 +02:00
parent e4fee05c96
commit a04cfcc233
2 changed files with 31 additions and 50 deletions
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14
java/RPCClient.java
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@ -5,9 +5,7 @@ import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.UUID;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.*;
public class RPCClient implements AutoCloseable {
@ -31,12 +29,12 @@ public class RPCClient implements AutoCloseable {
String response = fibonacciRpc.call(i_str);
System.out.println(" [.] Got '" + response + "'");
}
} catch (IOException | TimeoutException | InterruptedException e) {
} catch (IOException | TimeoutException | InterruptedException | ExecutionException e) {
e.printStackTrace();
}
}
public String call(String message) throws IOException, InterruptedException {
public String call(String message) throws IOException, InterruptedException, ExecutionException {
final String corrId = UUID.randomUUID().toString();
String replyQueueName = channel.queueDeclare().getQueue();
@ -48,16 +46,16 @@ public class RPCClient implements AutoCloseable {
channel.basicPublish("", requestQueueName, props, message.getBytes("UTF-8"));
final BlockingQueue<String> response = new ArrayBlockingQueue<>(1);
final CompletableFuture<String> response = new CompletableFuture<>();
String ctag = channel.basicConsume(replyQueueName, true, (consumerTag, delivery) -> {
if (delivery.getProperties().getCorrelationId().equals(corrId)) {
response.offer(new String(delivery.getBody(), "UTF-8"));
response.complete(new String(delivery.getBody(), "UTF-8"));
}
}, consumerTag -> {
});
String result = response.take();
String result = response.get();
channel.basicCancel(ctag);
return result;
}

67
java/RPCServer.java
View File

@ -14,53 +14,36 @@ public class RPCServer {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
try (Connection connection = factory.newConnection();
Channel channel = connection.createChannel()) {
channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null);
channel.queuePurge(RPC_QUEUE_NAME);
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(RPC_QUEUE_NAME, false, false, false, null);
channel.queuePurge(RPC_QUEUE_NAME);
channel.basicQos(1);
channel.basicQos(1);
System.out.println(" [x] Awaiting RPC requests");
System.out.println(" [x] Awaiting RPC requests");
Object monitor = new Object();
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
AMQP.BasicProperties replyProps = new AMQP.BasicProperties
.Builder()
.correlationId(delivery.getProperties().getCorrelationId())
.build();
DeliverCallback deliverCallback = (consumerTag, delivery) -> {
AMQP.BasicProperties replyProps = new AMQP.BasicProperties
.Builder()
.correlationId(delivery.getProperties().getCorrelationId())
.build();
String response = "";
String response = "";
try {
String message = new String(delivery.getBody(), "UTF-8");
int n = Integer.parseInt(message);
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.toString());
} finally {
channel.basicPublish("", delivery.getProperties().getReplyTo(), replyProps, response.getBytes("UTF-8"));
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
// RabbitMq consumer worker thread notifies the RPC server owner thread
synchronized (monitor) {
monitor.notify();
}
}
};
channel.basicConsume(RPC_QUEUE_NAME, false, deliverCallback, (consumerTag -> { }));
// Wait and be prepared to consume the message from RPC client.
while (true) {
synchronized (monitor) {
try {
monitor.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
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 -> {}));
}
}