How to get to FutureTask execution state?

Question

I have a singleThreadExecutor in order to execute the tasks I submit to it in serial order i.e. one task after another, no parallel execution.

I have runnable which

Answer 1

You could wrap anything you submit to this service in a Runnable that records when its run method is entered.

public class RecordingRunnable implements Runnable {
    private final Runnable actualTask;
    private volatile boolean isRunning = false;
    //constructor, etc

    public void run() {
        isRunning = true;
        actualTask.run();
        isRunning = false;
    }

    public boolean isRunning() {
       return isRunning;
    }
}