JavaFX RESTful client with DataFX

[Tai Hu]

Hi,

    Current I am building a JavaFX RESTful client with DataFX. However, I ran into a problem due to DataFX is retrieving data in the background thread. In my Login window, once user click on login, I will call the following code in my UI controller

public ObjectProperty<RestResponse> login(String userName, String password) {

    RestSource<RestResponse> restSource = new RestSource("url to my service", new JsonConverter(RestResponse.class));

    ObjectDataProvider provider = new ObjectDataProvider(restSource);

    provider.retrieve();

    return provider.getData();

}

However, since data retrieving is done in a background thread, at that moment, provider.getData() is not populated. How can I let my application pause and wait until data available?

Thanks so much for your help,

Tai

[Johan Vos]

Hi Tai,

What you typically do in this situation is that you add a listener to the worker property so that you get notified when the call succeeded (or failed), e.g. something like

Worker worker = provider.retrieve();

ObjectProperty<RestResponse> result = provider.getData();

worker.stateProperty.addListener(new ChangeListener<Worker.State>() {

  public void changed (Observable o, State oldState, State newState) {

if (newState == State.SUCCEEDED) {

// and here your checks, e.g.

if (result.validlogin) {
}

}

   }

})

- Johan

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[Hendrik Ebbers]

Hi,

or you can add a listener directly to the ObjectProperty<RestResponse> instance.

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[Tai Hu]

Thanks for your help. I think I will add a listener on my RestResponse.

[Johan Vos]

In that case, you have to be careful that the RestResponse itself might be created before all values on it are filled. You will get a callback when the object is created, but there is no guarantuee that the fields are already completed, and you won't be notified afterwards, unless you use properties for those fields as well.

- Johan

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