import io.nats.client.Connection;
import io.nats.client.Dispatcher;
import io.nats.client.Nats;

public class Subscriber {
  public static void main(String[] args) throws Exception {
    Connection nc = Nats.connect("nats://nats:4222");

    Dispatcher dispatcher = nc.createDispatcher(msg -> {
      String received = new String(msg.getData()).trim();
      String[] parts = received.split(",");
      if (parts.length >= 2) {
        int counter = Integer.parseInt(parts[0].trim());
        long sendTime = Long.parseLong(parts[1].trim());
        long latency = System.currentTimeMillis() - sendTime;

        System.out.printf("Received: %d | Latency: %d ms%n", counter, latency);
      }
    });

    dispatcher.subscribe("demo.subject");

    Thread.sleep(Long.MAX_VALUE);
  }
}