*/
    @Override
    public void close() {
        noLongerMutable();
        if (state.compareAndSet(State.STARTED, State.CLOSED)) {
            CompositeStoppable.stoppable(allServices).stop();
        }
    }

    private void serviceRequested() {
        noLongerMutable();
        if (state.get() == State.CLOSED) {