rabbitMQ学习（六）

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 java.util.UUID;

public class RPCClient {

private Connection connection;
private Channel channel;
private String requestQueueName = "rpc_queue";
private String replyQueueName;
private QueueingConsumer consumer;

public RPCClient() throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
connection = factory.newConnection();
channel = connection.createChannel();

replyQueueName = channel.queueDeclare().getQueue();
consumer = new QueueingConsumer(channel);
channel.basicConsume(replyQueueName, true, consumer);
}

public String call(String message) throws Exception {
String response = null;
String corrId = UUID.randomUUID().toString();

BasicProperties props = new BasicProperties
.Builder()
.correlationId(corrId)
.replyTo(replyQueueName)
.build();

channel.basicPublish("", requestQueueName, props, message.getBytes("UTF-8"));

while (true) {
QueueingConsumer.Delivery delivery = consumer.nextDelivery();
if (delivery.getProperties().getCorrelationId().equals(corrId)) {
response = new String(delivery.getBody(),"UTF-8");
break;
}
}

return response;
}

public void close() throws Exception {
connection.close();
}

public static void main(String[] argv) {
RPCClient fibonacciRpc = null;
String response = null;
try {
fibonacciRpc = new RPCClient();

System.out.println(" [x] Requesting fib(30)");
response = fibonacciRpc.call("30");
System.out.println(" [.] Got '" + response + "'");
}
catch  (Exception e) {
e.printStackTrace();
}
finally {
if (fibonacciRpc!= null) {
try {
fibonacciRpc.close();
}
catch (Exception ignore) {}
}
}
}
}

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;

public class RPCServer {

private static final String RPC_QUEUE_NAME = "rpc_queue";

private static int fib(int n) {
if (n ==0) return 0;
if (n == 1) return 1;
return fib(n-1) + fib(n-2);
}

public static void main(String[] argv) {
Connection connection = null;
Channel channel = null;
try {
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");

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  (Exception e) {
e.printStackTrace();
}
finally {
if (connection != null) {
try {
connection.close();
}
catch (Exception ignore) {}
}
}
}
}