*/
    private State evaluateState() {
        State current = state.get();

        if (current == State.OPEN) {
            long timeSinceLastFailure = System.currentTimeMillis() - lastFailureTime.get();
            if (timeSinceLastFailure > timeoutMillis) {
                if (state.compareAndSet(State.OPEN, State.HALF_OPEN)) {
                    stateChangeTime.set(System.currentTimeMillis());

                log.warn("Listener threw exception", ex);
            }
        }
    }

    private boolean shouldAttemptReset() {
        long timeSinceLastFailure = System.currentTimeMillis() - lastFailureTime.get();
        return timeSinceLastFailure >= resetTimeoutMillis;
    }

    private void transitionTo(State newState) {
        State oldState = state.getAndSet(newState);