How to manipulate the result of a Callable

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This is my JavaFX Controller

public class MainController {
   private Future<Graph> operation;
   private ExecutorService executor = Executors.newSingleThreadExecutor();

   @FXML
   private void createSession() { //invoked by a button click in the view
      //GraphCreationSession implements Callable<Graph>
      GraphCreationSession graphSession = new GraphCreationSession();

      if (operation != null && !operation.isDone()) {
         //cancel previous session
         operation.cancel(true);
      }
      operation = executor.submit(graphSession);
      ???
    }
 }

So my question is, what is the idiom to deal with the result of the Future? in a javaFX context

I know I can do operation.get() and the thread will block until the operation is finished, but I would be blocking the Application thread. I'm thinking of a callback when the Callable finishes and I found out CompletableFuture, which kind of does that via thenAccept but based on this answer the thread will still be blocked, which defeats the point of a Future, like the answer mentions. In my particular case the result of the Callable (Graph in my sample) contains a result that I want to display in a panel when the operation completes.

I'm using java 8

asked 30 secs ago

Hilikus

1,866

How to manipulate the result of a Callable