SOCKJS client - Detect server is unreachable

Question

I'm using vertxbus that internally built upon sockjs and I have a basic question.

When I call 'onopen' for the first time in order to establish a connection, How can I know that server is down?

At this point when I call 'onopen' and pass a callback function - if server is down the method is stuck and doesn't return at all.

Thanks!

Answer 1

You can check this code , where I'm using EventBus.

Here is the Reference code

 this.eventBus = new EventBus(this.URL);
    this.eventBus.onopen = (e) => {
           this._opened = true;
            console.log("open connection");
            this.callHandlers('open', e);
            this.eventBus.publish("http://localhost:8082", "USER LOGIN INFO");

            this.eventBus.registerHandler("http://localhost:8081/pushNotification", function (error, message) {
               console.log(message.body);


            //$("<div title='Basic dialog'>Test   message</div>").dialog();

      });
    }
    this.eventBus.onclose = (e) => {
        this.callHandlers('close', e);
      }
    }