CODEWITHSUNDEEP
cookiespushvaadin8
Natalie
Natalie

Reputation: 471

Vaadin 8: Dynamically turn on and off @Push to use @Push with cookies

In my application (Vaadin.8.6.3, Tomcat 9 and Maven 3) I need to set cookies which works well unless I use @Push. I need @Push only for one progress window implemented as described here.

I read that it is possible to turn @Push on and off using e.g.

getUI().getPushConfiguration().setPushMode(PushMode.AUTOMATIC);

I tried several ways and places in the code to turn @Push on and off, but nothing worked.

One example:

 @Push(PushMode.DISABLED)
public class MyUI extends UI {

Since I have more than one place in the code where I do cookies handling, I thought the best is to disable @Push in the UI class and turn it on when I run the background thread.

With a button click I start the runnable and in the runnable I turn on the @Push mode:

    class Loader implements Runnable {

    @Override
    public void run() {
        try {
            getUI().access(() -> {
                getUI().getPushConfiguration().setPushMode(PushMode.AUTOMATIC);
                getUI().getNavigator().navigateTo("scandataview/" + name);
            });

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

I have no error but nothing happens, i.e. the data I want to load are never loaded and the progress window stays forever.

My questions:

Is it possible to just turn on @Push to show the progress window while loading long data and turn it off after loading?

If yes, where in the code should I turn on/off the @Push?

If you need more information please let me know. I would be very glad for your help. Thank you!

Upvotes: 0

Views: 358

Answers (1)

Tatu Lund
Tatu Lund

Reputation: 10643

If you need Push only in one place and for some reason have described complications I recommend the following.

Set the push mode to manual i.e. @Push(PushMode.MANUAL)

And then modify the code as follows, i.e. perform manual push instead of relying automatic.

class Loader implements Runnable {

    @Override
    public void run() {
        try {
            getUI().access(() -> {
                getUI().getNavigator().navigateTo("scandataview/" + name);
                getUI().push();
            });

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

The above use of access() can be further improved according information provided in this question: Access method from current UI in Vaadin

Upvotes: 1

Related Questions