}

    public Set<OperationType> getOperationTypes() {
        return operationTypes;
    }

    public boolean isRequested(OperationType workItem) {
        return operationTypes.contains(workItem);
    }

    public boolean isAnyOperationTypeRequested() {
        return !operationTypes.isEmpty();
    }

    public boolean isAnyRequested(OperationType... types) {

	return &WorkArgs{
		NamespacedName: types.NamespacedName{Namespace: namespace, Name: name},
	}
}

// TimedWorker is a responsible for executing a function no earlier than at FireAt time.
type TimedWorker struct {
	WorkItem  *WorkArgs
	CreatedAt time.Time
	FireAt    time.Time
	Timer     clock.Timer
}

// createWorker creates a TimedWorker that will execute `f` not earlier than `fireAt`.

            }
        });
    }

    private void cancel(Iterable<AsyncWorkCompletion> workItems) {
        for (AsyncWorkCompletion workItem : workItems) {
            workItem.cancel();
        }
    }

    private void startWaiting(BuildOperationRef operation, List<AsyncWorkCompletion> workItems) {
        lock.lock();
        try {