#2613
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Ran 14 Jul 2021 07:38AM UTC

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Files 73

Run time 5s

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Build # #2613

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push

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Committed by

ben-manes

Commit Message

Optimize refreshAfterWrite

When an entry is eligible for refresh, only one thread should block to
schedule it. Previously all readers would block on a map computeIfAbsent
operation to obtain the future. While this allows refreshes to be
linearizable, it adds a small and unnecessary synchronization point. The
change restores the non-blocking behavior of v2.x, while keeping the
improvements of v3's rewrite.

The write timestamp is CAS'd as a soft lock to allow subsequent readers
to skip attempting to refresh. The least significant bit is used as a
flag for locking, causing the timestamp to be off by 1ns from the ideal
value. (Thanks @Maaartinus for suggesting this idea in https://github.com/ben-manes/caffeine/issues/282#issuecomment-440887934)

Also restored from v2 is to suppress and log exceptions if the cache
loader fails when producing the refresh future.

The inspections to obtain an entry's age were improved, such as not
resurrecting an expired entry.

Coverage Stats

6220 of 6713 relevant lines covered (92.66%)

0.93 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	#2613.1	14 Jul 2021 07:38AM UTC	0	92.66

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