blocks.store.cache — mvxcvi/blocks 1.2.0

Cache stores provide logical block storage backed by two other stores, a primary store and a cache. Blocks are added to the cache on reads and writes, and evicted with a least-recently-used strategy to keep the cache under a certain total size. Operations on this store will prefer to look up blocks in the cache, and fall back to the primary store when not available.

Because the caching logic runs locally, the backing cache storage should not be shared among multiple concurrent processes.

caching-block-store clj

(caching-block-store size-limit & {:as opts})

Creates a new logical block store which will use one block store to cache up to a certain size of content for another block store. The store should have a :primary and a :cache associated with it for backing block storage.

Supported options are:

• :max-block-size do not cache blocks larger than this size
• :primary set a backing primary store
• :cache set a backing cache store

reap! clj

(reap! store target-free)

Given a target amount of space to free and a cache store, deletes blocks from the cache to free up the desired amount of space. Returns a summary of the deleted entries.