avatarVikas Taank

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InterSenior Java Lead Interview Questions.(Advanced)-07

What are micro services?

Micro Services Characteristics

Could you describe the ways micro services can communicate with one another?

Microservices can communicate using several methods as described below.

Micro Service Communications

For more details on micro service inter communications please refer to my article:

Could you please explain Web Sockets and how are they used.

Web Socket Server.

import javax.websocket.OnMessage;
import javax.websocket.server.ServerEndpoint;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpointConfig;
@ServerEndpoint("/demo")
public class WebSocketServer {
    @OnMessage
    public String onMessage(String message) {
        return "Server echoed: " + message;
    }
    public static void main(String[] args) {
        // Server setup code goes here
        // Typically, you would use an external server like Tomcat or Jetty to run this WebSocket server
    }
}

WebSocket Client

import javax.websocket.ContainerProvider;
import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;
import java.net.URI;

public class WebSocketClient {

    @javax.websocket.ClientEndpoint
    public static class ClientEndpoint {

        @OnMessage
        public void onMessage(String message) {
            System.out.println("Received message: " + message);
        }
    }

    public static void main(String[] args) {
        try {
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            String uri = "ws://localhost:8080/demo"; // Replace with your server URI
            Session session = container.connectToServer(ClientEndpoint.class, URI.create(uri));

            session.getBasicRemote().sendText("Hello WebSocket");
            // Wait to ensure the message is received before closing
            Thread.sleep(1000);

            session.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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Interview
Interview Questions
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Microservices
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