session timeout

Implement the HandshakeInter as below.
```java
public class HttpSessionIdHandshakeInterceptor implements HandshakeInterceptor {

    public boolean beforeHandshake(ServerHttpRequest request, 
            ServerHttpResponse response, 
            WebSocketHandler wsHandler, 
            Map<String, Object> attributes) 
              throws Exception {
        if (request instanceof ServletServerHttpRequest) {
            ServletServerHttpRequest servletRequest = (ServletServerHttpRequest) request;
            HttpSession session = servletRequest.getServletRequest().getSession(false);
            if (session != null) {
                attributes.put(SESSION_ATTR, session.getId());
            }
        }
        return true;
    }

    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response,
                               WebSocketHandler wsHandler, Exception ex) {
    }
}
```
Then Add to the endpoint.
```java
public class WebSocketConfig extends 
      AbstractWebSocketMessageBrokerConfigurer {

public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/portfolio")
            .withSockJS()
            .setInterceptors(new HttpSessionIdHandshakeInterceptor());

}
...
}
```
Next we can create a ChannelInterceptorAdapter that uses the session id to update the last accessed time using Spring Session. For example:
```java
@Bean public ChannelInterceptorAdapter sessionContextChannelInterceptorAdapter() {
return new ChannelInterceptorAdapter() {
    @Override
    public Message<?> preSend(Message<?> message, MessageChannel channel) {
        Map<String, Object> sessionHeaders = SimpMessageHeaderAccessor.getSessionAttributes(message.getHeaders());
        String sessionId = (String) sessionHeaders.get(SESSION_ATTR);
        if (sessionId != null) {
            Session session = sessionRepository.getSession(sessionId);
            if (session != null) {
                sessionRepository.save(session);
            }
        }
        return super.preSend(message, channel);
    }
};
}
```