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.JSONStringer;
import org.json.JSONException;
public class Client {
private Connection connection;
private Channel channel;
private String replyQueueName;
private QueueingConsumer consumer;
public Client init()
throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setUsername("rpc_user");
factory.setPassword("rpcme");
connection = factory.newConnection();
channel = connection.createChannel();
return this;
}
public Client setupConsumer()
throws Exception {
replyQueueName = channel.queueDeclare().getQueue();
consumer = new QueueingConsumer(channel);
channel.basicConsume(replyQueueName, false, consumer);
return this;
}
public String call(String message) throws Exception {
String response = null;
channel.basicPublish(
"rpc",
"ping",
getRequestProperties(),
message.getBytes()
);
System.out.println("Sent 'ping' RPC call. Waiting for reply...");
while (true) {
Delivery delivery = consumer.nextDelivery();
response = new String(delivery.getBody(), "UTF-8");
break;
}
return response;
}
public void close() throws Exception {
connection.close();
}
private BasicProperties
getRequestProperties() {
return new BasicProperties
.Builder()
.replyTo(replyQueueName)
.build();
}
public static String createRequest()
throws JSONException {
float epoch = System.currentTimeMillis()/1000;
JSONStringer msg = new JSONStringer();
return msg
.object()
.key("client_name")
.value("RPC Client 1.0")
.key("time")
.value(Float.toString(epoch))
.endObject().toString();
}
public static void main(String[] args) {
Client client = null;
String response = null;
try {
client = new Client();
client.init().setupConsumer();
response = client.call(Client.createRequest());
System.out.println("RPC Reply --- " + response);
}
catch (Exception e) {
e.printStackTrace();
}
finally {
if (client!= null) {
try {
client.close();
}
catch (Exception ignore) {}
}
}
}
}