Angular 2 spring boot server side events

Question

Can somebody please provide me an example for spring boot server side events?

Basically I need to push server side events to browser. I\'m using angular 2 and sprin

Answer 1

The Answer from Pratap A.K is great. But to keep it a little bit cleaner, you shoud create a NotificationService which implements a Interface. Like this:

NotificationServiceImpl.java

public class NotificationServiceImpl implements NotificationService {

public static final List emitters = Collections.synchronizedList(new ArrayList<>());

@Override
public SseEmitter initSseEmitters() {

    SseEmitter emitter = new SseEmitter();
    emitters.add(emitter);
    emitter.onCompletion(() -> emitters.remove(emitter));

    return emitter;
}

@Override
public void sendSseEventsToUI(WebSource notification) {
    List sseEmitterListToRemove = new ArrayList<>();
    this.emitters.forEach((SseEmitter emitter) -> {
        try {
            emitter.send(notification, MediaType.APPLICATION_JSON);
        } catch (IOException e) {
            emitter.complete();
            sseEmitterListToRemove.add(emitter);
            e.printStackTrace();
        }
    });
    this.emitters.removeAll(sseEmitterListToRemove);
  }
}

NotificationService.java

public interface NotificationService {

public SseEmitter initSseEmitters();
public void sendSseEventsToUI(WebSource notification);

}

SSEController.java

@RestController
@RequestMapping("/mystream")
public class SSEController {

@Autowired
NotificationServiceImpl INotificationServiceImpl;

@CrossOrigin
@RequestMapping(path = "/streamsource", method = RequestMethod.GET)
public SseEmitter stream() throws IOException {

    return INotificationServiceImpl.initSseEmitters();
  }
}

Best regards