There is one thing to clarify and two differences:
- There are no locks in atomic operations, remember atomic operations
are based on CAS.
- Incrementing an *AtomicInteger* will definitely be cheaper than
incrementing an *AtomicLong.*
- Comparing the value and returning is definitely cheaper
than division/mod operation which is CPU intensive.
- And last but least important and highly unlikely: No risk of
overflowing the counter because the value is always reset to zero.
Though you are right, I should JMH it, let me do that tonight:
Here is what the side-effect function looks like in Java 8:
/**
* Atomically updates the current value with the results of
* applying the given function to the current and given values,
* returning the updated value. The function should be
* side-effect-free, since it may be re-applied when attempted
* updates fail due to contention among threads. The function
* is applied with the current value as its first argument,
* and the given update as the second argument.
*
* @param x the update value
* @param accumulatorFunction a side-effect-free function of two arguments
* @return the updated value
* @since 1.8
*/
public final int accumulateAndGet(int x,
IntBinaryOperator accumulatorFunction) {
int prev, next;
do {
prev = get();
next = accumulatorFunction.applyAsInt(prev, x);
} while (!compareAndSet(prev, next));
return next;
}
--
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>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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