Callback in Native Messaging

See more:

Javascript

Java

extension

chrome

I have a native application in Java and a Chrome extension. A round trip of my application is like this:

1- JavaScript initiates a call to Native App.
2- Native app reads the stream and does some calculations.
3- Native app needs to call a JS function and needs its result for some further calculations. If the native app calls JS (by sending a message via the extension), then what happens? How can I get the result back?

I know that I call call a callback by JS later when the call is done, but how can I wait here on Java side to get the result back? Previously I had an Applet and used to use FutureTask object, but do you think it would be here also possible to create a FutureTask?

Thank you very much.