Design pattern for threading audio in a swing app: How to notify midi executor is shutdown to drive a GUI state-change?

I think you might get along OK with something like this.

I'm not sure you really need a while loop in a GUI. Can you set the GUI up to receive messages? For example, when a MIDI file ends, if that is important info, have the Listener on the MIDI file send whatever message is wanted to the GUI panel, maybe along with an update or repaint().

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