Bump moka from 0.12.1 to 0.12.5 in /lean

[dependabot]

Bumps moka from 0.12.1 to 0.12.5.

Changelog

Sourced from moka's changelog.

Version 0.12.5

Added

• Added support for a plain LRU (Least Recently Used) eviction policy (#390[gh-pull-0390]):
  • The LRU policy is enabled by calling the eviction_policy method of the cache builder with a policy obtained by EvictionPolicy::lru function.
  • The default eviction policy remains the TinyLFU (Tiny, Least Frequently Used) as it maintains better hit rate than LRU for most use cases. TinyLFU combines LRU eviction policy and popularity-based admission policy. A probabilistic data structure is used to estimate historical popularity of both hit and missed keys. (not only the keys currently in the cache.)
  • However, some use cases may prefer LRU policy over TinyLFU. An example is recency biased workload such as streaming data processing. LRU policy can be used for them to achieve better hit rate.
  • Note that we are planning to add an adaptive eviction/admission policy called Window-TinyLFU in the future. It will adjust the balance between recency and frequency based on the current workload.

Version 0.12.4

Fixed

• Ensure crossbeam-epoch to run GC when dropping a cache (#384[gh-pull-0384]):
  • crossbeam-epoch crate provides an epoch-based memory reclamation scheme for concurrent data structures. It is used by Moka cache to safely drop cached entries while they are still being accessed by other threads.
  • crossbeam-epoch does its best to reclaim memory (drop the entries evicted from the cache) when the epoch is advanced. However, it does not guarantee that memory will be reclaimed immediately after the epoch is advanced. This means that entries can remain in the memory for a while after the cache is dropped.
  • This fix ensures that, when a cache is dropped, the epoch is advanced and crossbeam-epoch's thread local buffers are flushed, helping to reclaim memory immediately.
  • Note that there are still chances that some entries remain in the memory for a while after a cache is dropped. We are looking for alternatives to crossbeam-epoch to improve this situation (e.g. #385[gh-issue-0385]).

Added

• Added an example for reinserting expired entries to the cache. (#382[gh-pull-0382])

Version 0.12.3

Added

... (truncated)

Commits

• b5560df Merge pull request #390 from moka-rs/lru-policy
• 27dd941 Tweak some doc comments
• afc8c6b Update the change log
• e11a6e1 Bump the version to v0.12.5
• 8819287 Fix typos in the doc
• 4ca1595 Update the change log
• 34cc03b Support the plain LRU policy
• b32f05b Apply rustfmt
• 8ac62ed Support the plain LRU policy
• 2e904db Merge pull request #386 from moka-rs/prepare-0.12.4
• Additional commits viewable in compare view

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