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Similarly, the descriptions for both AppComponent and AppUiComponent remain the same as in the Custom View tutorial.

AppUiMessageHandler

This class extends UiMessageHandler to implement code to handle events from the (client-side) sample application view. Salient features to note:

(1) implement createRequestHandlers() to provide request handler implementations for specific event types from our view.

@Override
protected Collection<RequestHandler> createRequestHandlers() {
    return ImmutableSet.of(
            new SampleDataRequestHandler(),
            new SampleDetailRequestHandler()
    );
}