VladRodionov opened a new pull request, #8475:
URL: https://github.com/apache/hbase/pull/8475
### Summary
This PR adds a compatibility bridge from the existing `BlockCache` API to
the new `CacheEngine` abstraction.
`TieredExclusiveTopology` and `TopologyBackedCacheAccessService` operate on
`CacheEngine` instances, but the existing production cache implementations such
as `LruBlockCache`, `BucketCache`, `TinyLfuBlockCache`, and
`LruAdaptiveBlockCache` still implement `BlockCache`.
`BlockCacheBackedCacheEngine` allows these legacy cache implementations to
participate in topology-backed cache wiring before they are migrated to
implement `CacheEngine` directly.
This is an incremental migration step. It does not change production cache
wiring and does not remove or replace `CombinedBlockCache`.
### Changes
* Adds `BlockCacheBackedCacheEngine`, a `CacheEngine` adapter backed by an
existing `BlockCache`.
* Adds `CacheEngines` helper factory for creating `CacheEngine` instances
from legacy `BlockCache` instances.
* Adds unit tests for adapter delegation and null validation.
* Adds tests proving that `TopologyBackedCacheAccessService` can operate
through `TieredExclusiveTopology` using `BlockCache`-backed engines.
### Migration path
The new cache architecture is moving toward:
```text
CacheAccessService
-> CacheTopology
-> CacheEngine(s)
```
### AI assistance disclosure
This PR was prepared with assistance from ChatGPT. All changes were
reviewed, tested, and submitted by the author.
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