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Create function backed cache

Description

A cache implementation that is backed by a function that performs some action on a cache miss could serve as a front for any of the existing cache impls.

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Sean CorfieldMarch 1, 2018 at 7:25 AM

@fogus is this the basis for FnCache which doesn't seem to have a factory or be documented/tested? Is that just "dead" code now?

Also, it seems that through fills some of this gap since it provides for functions to run on a cache miss (although it still doesn't address when the function can't get a value, right?).

FogusDecember 19, 2011 at 1:29 PM

Thanks for the feedback Rich. I believe I understand the subtleties now.

Rich HickeyDecember 16, 2011 at 3:45 PM

It doesn't perform an action per se, it gets a passed key and returns a value, which the cache then caches (associates with the key) and returns. The tricky bit is when the function can't get a value. There needs to be some protocol for communicating that (could be like 3 arg get), and, should the cache be asked again later for the same key, calling the fn again.

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Created December 16, 2011 at 2:57 PM
Updated September 2, 2022 at 3:03 PM