pjfanning commented on PR #371:
URL: https://github.com/apache/incubator-pekko/pull/371#issuecomment-1593015247
I tried a solution with an AtomicReference around the state but its
performance was slower than the synchronization and Semaphore locking variants.
Approximately in SecureRandom territory in the 8 threads microbenchmark.
```
private val state = {
val (index, increment) = {
val r = new SecureRandom()
(r.nextLong, r.nextLong())
}
new AtomicReference(Array(index, increment, 1))
}
@tailrec
final def nextId(): Short = {
val array = state.get()
var index = array(0)
var increment = array(1)
var count = array(2)
val result = (0xFFFFFFFF & index).asInstanceOf[Short]
index -= increment
// Incorporate the counter into the increment to create a
// tetrahedral number additional term.
increment -= {
count += 1
count - 1
}
if (state.compareAndSet(array, Array(index, increment, count))) {
result
} else {
nextId()
}
}
```
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