another question

Is there an event for when a task has finished?

A task has finished in the last line of onRun(). What do you need this for?

When you switch task, you can write case 0:

Normal task includes one method

Code:

# onRun()

You can run code on last task run differently for different task type (repeatable or delayed)

Async task includes two methods

Code:

# onRun()
# ... some functions passing result
# onCompletion(Server server)

This is self-explanatory.