how to capture connection event in my webSocket server with Spring 4?

Question

I did a simple web socket communication with spring 4,STOMP and sock.js, following this https://github.com/rstoyanchev/spring-websocket-portfolio and this http://assets.spri

Answer 1

As I understand, the question with DISCONNECT event is not solved in this topic. Handshake interception gives you only connect info but not disconnect.

I have achieved this with the interceptors of inbound channel:

    ...
    
        
            
        
    

...and class...

import java.security.Principal;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.simp.SimpMessageType;
import org.springframework.messaging.support.ChannelInterceptorAdapter;

public class MyChannelInterception extends ChannelInterceptorAdapter {

private static final Logger LOGGER = LogManager.getLogger(WrcChannelInterception.class);

@Override
public Message preSend(Message message, MessageChannel channel) {

    MessageHeaders headers = message.getHeaders();
    SimpMessageType type = (SimpMessageType) headers.get("simpMessageType");
    String simpSessionId = (String) headers.get("simpSessionId");

    if (type == SimpMessageType.CONNECT) {
        Principal principal = (Principal) headers.get("simpUser");
        LOGGER.debug("WsSession " + simpSessionId + " is connected for user " + principal.getName());
    } else if (type == SimpMessageType.DISCONNECT) {
        LOGGER.debug("WsSession " + simpSessionId + " is disconnected");
    }
    return message;
}
}

Please note that Principal is available on CONNECT but not on DISCONNECT, however you have sweet Session ID