The art of waiting

The hour registration application is working nicely, on windows, on android, on OSX, but there is always room for improvement. One of the most obvious issues is that the original applet is a lot quicker when retrieving data from the server. I suspect this has to do with the fact that the applet maintains a web session and that the JavaFX app does an authentication on each request. And yes, of course I could (and probably will) improve that, but it also is an opportunity to try out something else; asynchronous communication.¬†Now, I could pull open a can of threads and try to do this myself, but there have been¬†wheels invented for this. So in this post I’m going to try Java 8’s CompleteableFuture, RxJava and JDeferred.

The app’s communication is very suited to try something like this, because there are 6 separate calls being made to the backend, and some of those calls are depending on each other. The calls are:

dh2fx_fetchData
1. The hours for a given date.
2. Totals per project for the current week.
3. Totals per day for the current week.
4. All projects.
5. The favorite projects for the current user.

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