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n
nfrankel
07/06/2020, 1:14 PMhello
stupid question of the day
about this code snippet:
while (shorteneds.putIfAbsent(url, this) != null) {}d
diesieben07
07/06/2020, 1:16 PM Copy code
while (shorteneds.putIfAbsent(url, this) != null) {
// intentionally empty
}😅 1
j
Jurriaan Mous
07/06/2020, 1:17 PM Copy code
while (shorteneds.putIfAbsent(url, this) != null) Unit👍 1
n
nfrankel
07/06/2020, 1:19 PMthanks @diesieben07 @Jurriaan Mous
you were fast!
i prefer the second better as it relies on types
d
diesieben07
07/06/2020, 1:19 PMThe
Unitwhile (something) Intn
nfrankel
07/06/2020, 1:28 PMyep
but
IntUnitn
natpryce
07/06/2020, 1:38 PMWon’t the while busy-loop? It feels like there should be something in the body of the loop to wait for the existing entry to be removed
j
jw
07/06/2020, 1:54 PMIt should probably contain Thread.onSpinWait
And that better had be a synchronized collection or you might loop forever!
n
nfrankel
07/06/2020, 2:15 PMFYI
it’s actually a hazelcast call
and it should loop until it finds no collision
c
Cheolho Jeon
07/06/2020, 2:31 PMI might try below. even though it creates a longer code but I think it’s more readable.
Copy code
var result: Any?
do {
result = shorteneds.putIfAbsent(url)
} while(result != null)
// or
var result = shorteneds.putIfAbsent(url)
while (result != null) {
result = shorteneds.putIfAbsent(url)
}while (condition) do {action}while(condition - and - action)3 Views