Module cache 

Facility for cached asynchronous operations, with operations keyed by a key type and ensuring mutual exclusion of operations with the same key.

Structs

Cache

Cache for asynchronous operations. Each operation is associated with a key, and operations are cached, deduplicated and mutually exclusive with other operations on the same key, including in-progress operations.

CacheFut

A future returned on cache hits. CacheFut::wait returns a future which resolves when the cache value has been computed by another task.

CacheSetter

A value returned on cache misses. The owner of this struct should compute the value, then call CacheSetter::set to write the value into the cache.