Java 8: Asynchronous Function

package util;

import java.util.function.Supplier;

/**
 * Created by Roman on 04.11.14.
 */
public class AsyncFunction<T> {

    private Thread thread;
    private T result;
    private boolean isStarted = false;

    public AsyncFunction(Supplier<T> supplier) {
        this(supplier, true);
    }

    public AsyncFunction(Supplier<T> supplier, boolean autoStart) {
        thread = new Thread(() -> result = supplier.get());
        if (autoStart) {
            thread.start();
            isStarted = true;
        }
    }

    public void start() {
        if (!isStarted) {
            thread.start();
        } else {
            throw new RuntimeException("Thread already started");
        }
    }

    public T getResult() {
        if (!isStarted) {
            throw new RuntimeException("Thread not started");
        }
        try {
            thread.join();
            thread = null;
            return result;
        } catch (InterruptedException e) {
            throw new RuntimeException("Interrupted by InterruptedException", e);
        }
    }

    public static<T> AsyncFunction<T> start(Supplier<T> supplier) {
        return new AsyncFunction<>(supplier, true);
    }

    public static<T> AsyncFunction<T> wait(Supplier<T> supplier) {
        return new AsyncFunction<>(supplier, false);
    }
}