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Recent Posts
Vaadin Forum3. Vaadin 6, 7, 8Framework UI

Refresher or java.util.Timer

Avishay Balderman
10 years ago Jan 04, 2012 7:16pm

Hi
I have a situation that I have to poll the backend every X msec and the update the UI with the fresh backend data.
Only ONE user (the one that activates this specific window) should get the refreshed data. (The refresh action is actually changing the value of a Label).
Here is my question:
Should I go with Refresher or java.util.Timer will be enough?

Thanks

Avishay

Last updated on Jan, 4th 2012
Mathias Clerc
10 years ago Jan 05, 2012 1:08am

Timer run on server side which can not refresh the UI automatically. It will also not provide any thread safety if you decide to change the UI (you need to synchronize yourself)
Refresher runs on both sides (a script on client and a listener on server) and so can refresh the UI. As it runs into main Vaadin thread there is no risk of race condition here.

So in your case, you should go with the refresher.

For more details on polling, pushing and background UI updates see this sticky for a good explanation.

Avishay Balderman
10 years ago Jan 05, 2012 7:30am

Thanks.
I will have a look there.
Avishay