SimpMessagingTemplate vs MessageSendingOperations

Question

I've just started to study Spring 4 stomp over websocket. What are the differences between these two? What cases should I use one over the another?

Answer 1

There is no difference: MessageSendingOperations is an interface - contract. SimpMessagingTemplate is a concrete implementation of the first one.

Typically it's enough to configure bean for concrete implementation, but inject it by type of its conctract:

@Bean
public MessageSendingOperations messagingTemplate() {
    return new SimpMessagingTemplate(this.inputChannel);
}

...

@Component
public class MyService {

   @Autowired
   private MessageSendingOperations  messagingTemplate;
}