Question about cache refresh

[kimmikimmi]

Is there best practice to refresh synchronously?
refresh asynchronously is good in most cases, but I have some cases it needs to block to return until refresh is done.

[ben-manes]

You might want #143, where LoadingCache#refresh would return CompletableFuture. Unfortunately that requires a major version bump since it changes the interface signature.

You might instead use asMap().computeIfPresent to perform the call synchronously. That would block other writers to that hashbin (~ per entry) but not block readers.

Another option is to use Caffeine.executor(Runnable::run) to perform any async logic directly on the caller's thread. In most cases this is okay, but if your code is expensive then it can add latency (e.g. some readers are penalized by performing the work).