A simple task (with subtasks) implemented in my custom TPL

SampleTask.java

Task<Boolean> maintask = new Task<Boolean>(myContext) {
	int internalState = 0;

	@Override
	public AwaitableState work() {
		switch(internalState){
			case 0:
				return Work0();
			case 1:
				return Work1();
			case 2:
				return Work2();
		}

		return AwaitableState.Completed;
	}

	private AwaitableState Work0(){
		internalState = 1;

		ArrayList<Awaitable> workers = new ArrayList<>();

		for(int i = 0; i < 100; i++){
			final int x = i;
			Task<Boolean> t = new Task<Boolean>() {
				@Override
				public AwaitableState work() {
					System.out.println("Work Item " + x + " is working on thread: " + Thread.currentThread().getId());
					return AwaitableState.Completed;
				}
			};

			context.submit(t);
			workers.add(t);
		}

		return waitFor(Task.whenAll(workers, context));
	}

	private AwaitableState Work1(){
		internalState = 2;

		ArrayList<Awaitable> workers = new ArrayList<>();

		for(int i = 0; i < 100; i++){
			final int x = 100 + i;
			Task<Boolean> t = new Task<Boolean>() {
				@Override
				public AwaitableState work() {
					System.out.println("Work Item " + x + " is working!");
					return AwaitableState.Completed;
				}
			};

			context.submit(t);
			workers.add(t);
		}

		return waitFor(Task.whenAll(workers, context));
	}

	private AwaitableState Work2(){
		this.retVal = true;
		return AwaitableState.Completed;
	}
};