import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.QueueingConsumer;
import com.rabbitmq.client.QueueingConsumer.Delivery;
import com.rabbitmq.client.AMQP.BasicProperties;
import org.json.JSONObject;
public class Server
{
private Connection connection;
private Channel channel;
private QueueingConsumer consumer;
public Server Server(){
return this;
}
public Server init()
throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setUsername("rpc_user");
factory.setPassword("rpcme");
connection = factory.newConnection();
channel = connection.createChannel();
channel.exchangeDeclare("rpc", "direct");
channel.queueDeclare("ping", false, false, false, null);
channel.queueBind("ping", "rpc", "ping");
consumer = new QueueingConsumer(channel);
channel.basicConsume("ping", false, "ping", consumer);
System.out.println(
"Waiting for RPC calls..."
);
return this;
}
public void closeConnection() {
if (connection != null) {
try {
connection.close();
}
catch (Exception ignore) {}
}
}
public void serveRequests() {
while (true) {
try {
Delivery delivery = consumer.nextDelivery();
BasicProperties props = delivery.getProperties();
channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
System.out.println(
"Received API call...replying..."
);
channel.basicPublish(
"",
props.getReplyTo(),
null,
getResponse(delivery).getBytes("UTF-8")
);
} catch (Exception e){
System.out.println(e.toString());
}
}
}
private String getResponse(Delivery delivery) {
String response = null;
try {
String message = new String(delivery.getBody(), "UTF-8");
JSONObject jsonobject = new JSONObject(message);
response = "Pong!" + jsonobject.getString("time");
}
catch (Exception e){
System.out.println(e.toString());
response = "";
}
return response;
}
public static void main(String[] args) {
Server server = null;
try {
server = new Server();
server.init().serveRequests();
} catch(Exception e) {
e.printStackTrace();
} finally {
if(server != null) {
server.closeConnection();
}
}
}
}