use LongAccumulator instead.

AtomicFieldUpdaters.java

public interface AtomicFieldUpdaters {

	static <T> void max(T self, long value, AtomicLongFieldUpdater<T> updater) {
		long max;
		do {
			max = updater.get(self);
			if (value < max) {
				break;
			}
		} while (updater.compareAndSet(self, max, value) == false);
	}

	static <T> void min(T self, long value, AtomicLongFieldUpdater<T> updater) {
		long min;
		do {
			min = updater.get(self);
			if (min < value && -1 < min) {
				break;
			}
		} while (updater.compareAndSet(self, min, value) == false);
	}
}