Devin Doucette e42bbbedab DDC: Implement ICacheStore on FDerivedDataBackendInterface ...

This allows the new cache to be implemented more efficiently using the old cache backends because functionality like the corruption wrapper and key length limiter can be bypassed and the individual backends can store cache records in whatever way is most efficient for them.

The hierarchical backend may request payloads when they are not required due to incomplete tracking of backend state, and GetPayload will never fill other backends due to the inefficiency of the existing backend framework.

The filesystem backend does not cache any state in memory, which makes requests for individual payloads less efficient than if it cached a mapping of cache payload key to raw hash after the first request for a cache key.

The HTTP, S3, and pak file backends are not implemented for the new interface.

The backends do not implement ICacheStore::CancelAll() because the existing backend framework provides WaitForQuiescence to wait for completion of async requests, and the implementation of ICacheStore by those backends works with that mechanism.

The non-leaf backends (hierarchical, async put, etc.) do not update stats from the ICacheStore functions.

#rb Zousar.Shaker
#rnx
#preflight 60899f35d324590001b47517

[CL 16148296 by Devin Doucette in ue5-main branch]

2021-04-28 16:22:18 -04:00

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