Create a cancellation method for player testing/classification.

[gluebaby]

Consider adding a method to cancel the classification of a player while in progress. Shouldn't be too hard, just check if target player is registered, if so unregistered them and cancel the task. You're using a scheduler, IIRC you cannot cancel those so consider using a BukkitTask (maybe? It's been a while since I've done scheduler programming but hopefully you get what I'm saying even though I may be wrong.

Also in that area, consider adding a boolean that returns whether the player is registered and being tested.

[Nova41]

Sure

[Nova41]

It seems that the current approach of cancelling sampling process is flawed and needs rewrite.

I can't think of a neat way to solve the issue at the point so I leave this open =)

[Nova41]

It seems like it's not that easy to forcibly terminate the sample session because the session relies on Thread.sleep to wait for enough angle sequence to be collected.

Maybe we need a new procedure. I plan to let sample sessions check every second that whether players being sampled requested to cancel the session, and once they did, terminate the session immediately. Obviously I have to no longer use Thread.sleep since you can't do anything (including check for requests) during sleeping.