Get the coordinate object from a asynchronous result

[LujieDuan]

I have worked on this but haven't got progress for days, so if anyone have time please take a look at my code and give me some advice:)

I want to make a http get request in Scala to the following URL: https://maps.googleapis.com/maps/api/geocode/json?address=101+Cumberland,+Saskatoon Which will give me a JSON object contains the lat and lng of this location.

Play framework recommends to handle the request and result as an asynchronous result. So I get

val futureResult : Future[Coordinate] = holder.withQueryString("address" -> parameterString).get().map{ response => (response.json \ "results")(0).as[Coordinate] }

where futureResult is a asynchronous result that contains the coordinate object. This is where I got stuck. How to get the coordinate from this asynchronous result?

The code is in the branch "duan_Handling_asynchronous_results" in app/coordinatesGetter/PopulateCoordinates.scala.

To run the code, type "./activator testOnly RunCoordinate".

[KatrinaHoffert]

Read this for how to use Futures.

Basically, you need to create the callback that is called when the future is completed. That'll have the results of the request.

[KatrinaHoffert]

Also, see here: https://www.playframework.com/documentation/2.0/ScalaWS

[LujieDuan]

Thanks Mike, the links are very helpful. I have got the coordinates out of the future. Thanks for saving my life again! :P