v0.12.1

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Fixed

• Fixed memory leak in future::Cache that occurred when get_with(),
  entry().or_insert_with(), and similar methods were used ([#​329][gh-issue-0329]).
  • This bug was introduced in v0.12.0. Versions prior to v0.12.0 do not
    have this bug.

Changed

• (Performance) Micro-optimize ValueInitializer ([#​331][gh-pull-0331], by
  [@​Swatinem][gh-Swatinem]).

v0.12.0

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Note
v0.12.0 has major breaking changes on the API and internal behavior.

• sync caches are no longer enabled by default: Please use a crate feature
  sync to enable it.

• No more background threads: All cache types future::Cache, sync::Cache, and
  sync::SegmentedCache no longer spawn background threads.

  • The scheduled-thread-pool crate was removed from the dependency.
  • Because of this change, many private methods and some public methods under the
    future module were converted to async methods. You may need to add .await
    to your code for those methods.

• Immediate notification delivery: The notification::DeliveryMode enum for the
  eviction listener was removed. Now all cache types behave as if the Immediate
  delivery mode is specified.

Please read the MIGRATION-GUIDE.md for more details.

Changed

• Removed the thread pool from future cache ([#​294][gh-pull-0294]) and sync
  caches ([#​316][gh-pull-0316]).
• Improved async cancellation safety of future::Cache. ([#​309][gh-pull-0309])

Fixed

• Fixed a bug that an internal do_insert_with_hash method gets the current
  Instant too early when eviction listener is enabled. ([#​322][gh-issue-0322])