ben-manes / caffeine / 2544

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travis-ci

Add optimistic fast path for putIfAbsent to avoid locking

This mirrors the optimization in computeIfAbsent, which only locks
if the lookup failed and the value may need to be computed.

See https://github.com/apache/openwhisk/pull/2797 for a use-case
where the users had to modify their usage to obtain their
performance goals.

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6134 of 6571 relevant lines covered (93.35%)

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