ButtonBase Executor Service should be closed on GpioController.shutdown()

[ribasco]

Screenshot of thread still alive after call to gpio.shutdown()

Test Code:

public class ButtonTest {
    private static final Logger log = LoggerFactory.getLogger(ButtonTest.class);
    private final GpioController gpio = GpioFactory.getInstance();
    private AtomicBoolean shutdown = new AtomicBoolean(false);

    public static void main(String[] args) throws Exception {
        new ButtonTest().run();
        log.info("Exiting Main");
    }

    private void run() throws Exception {
        createButton(RaspiPin.GPIO_06, "Shutdown", "shutdown", 3500, buttonHoldListener);
        while (!shutdown.get())
            Thread.sleep(1000);
        gpio.shutdown();
    }

    private ButtonReleasedListener buttonReleasedListener = buttonEvent -> log.info("Button {} released", buttonEvent.getButton().getName());

    private ButtonHoldListener buttonHoldListener = buttonEvent -> {
        log.info("Button {} held. Shutting down", buttonEvent.getButton().getName());
        shutdown.set(true);
    };

    private GpioButtonComponent createButton(Pin buttonPin, String name, String tag, int holdInterval, ButtonHoldListener holdListener) {
        GpioPinDigitalInput inputPin = gpio.provisionDigitalInputPin(buttonPin, name, PinPullResistance.PULL_UP);
        inputPin.setDebounce(64);
        GpioButtonComponent button = new GpioButtonComponent(inputPin, PinState.HIGH, PinState.LOW);
        button.setName(name);
        button.setTag(tag);
        button.addListener(buttonReleasedListener);
        if (holdListener != null)
            button.addListener(holdInterval, holdListener);
        return button;
    }
}