Devin Doucette 7bd5b197e8 DDC: Added the new cache interface UE::DerivedData::ICache ...

ICache will eventually replace the existing cache access functions on FDerivedDataCacheInterface. The notable differences relative to the existing interface are:

- It is asynchronous with completion callbacks by default, and allows waiting when necessary.
- It allows batch requests containing multiple cache records by default.
- It uses a structured cache key made up of a bucket name and a hash.
- It supports prioritization and cancellation of requests.
- It supports structured cache records with metadata.
- It supports attachments to allow multi-part cache records.
- It uses a typed request object instead of an opaque integer handle.
- It provides cache policy flags to control how to query and store cache records, and which parts of a cache record to fetch.

This initial implementation of ICache is totally synchronous and uses the existing cache backends for storage.

#rb Zousar.Shaker

[CL 15152247 by Devin Doucette in ue5-main branch]

2021-01-21 01:57:01 -04:00

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