Automatic 'loading' indicator when calling an async function

Question

I am looking for a way to automate showing and hiding a \'loading\' message when calling an async service, so instead of doing this:

showLoadingWidget();

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Answer 1

You could create a default callback superclass which takes a LoadingMessage object argument in its constructor, and provides hook methods for subclasses, e.g. onSuccess0 and onFailure0.

The implementation would be similar to:

public final void onFailure(Throwable caught) {
    loadingMessage.hide();
    onFailure0(caught);
}

protected abstract void onFailure0(Throwable caught);