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button.setOnAction(event -> button.setEnabled(false));

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void runOnUiToolkitThread(Runnable runnable);

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void runOnUiToolkitThreadAndWait(Runnable runnable);

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default void runOnUiToolkitThreadAndWait(Runnable runnable) throws InterruptedException, ExecutionException {
        FutureTask<Void> future = new FutureTask<>(runnable, null);
        runOnUiToolkitThread(future);
        future.get();
}

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public void runningOnBackgroundThread() {
  String userInput = runOnUiToolkitThreadAndWait(() -> textfield.getText());
  callWebservice(userInput);
}

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<T> T runOnUiToolkitThreadAndWait(Callable<T> callable);

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<T> Provider<T> runOnUiToolkitThread(Callable<T> callable);

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public interface UIThread {
  
  void runOnUiToolkitThread(Runnable runnable);
  
  <T> Provider<T> runOnUiToolkitThread(Callable<T> callable);
  
  void runOnUiToolkitThreadAndWait(Runnable runnable);
  
  <T> T runOnUiToolkitThreadAndWait(Callable<T> callable);
  

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public interface UIThread {
  
  void runOnUiToolkitThread(Runnable runnable);

    default <T> Future<T> runOnUiToolkitThread(Callable<T> callable) {
        FutureTask<T> future = new FutureTask<>(callable);
        runOnUiToolkitThread(future);
        return future;
    }

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flowActionHandler.handle("actionId");
flowActionHandler.navigate(NextController.class);
flowActionHandler.navigateBack();