LazyCache

• PR #126 (and issue #104) optimise cache key locking for faster performance under high CPU load and lots of concurrency. Thanks to @jjxtra

• Add options for expiration:
  • ExpirationMode.ImmediateExpiration which uses a timer to remove items from the cache as soon as they expire (more resource intensive)
  • ExpirationMode.LazyExpiration (existing default) which removes expired cache items when they are next accessed if they have expired.
• Fix #96 AddExpirationToken with CancellationChangeToken is not being honored
• Allow callers to pass MemoryCacheEntryOptions that is used at cache insertion time. This allows users to wire up callbacks and expiration tokens that fire at the correct time

• Fix #85 and #100 Absolute expiration not working with TimeSpan. Thank you to @Meberem and @Sinhk.
• Fix #124 casing for PackageReference - by @jnyrup

• Fix #82 Make constructor resolution specific when using aspnet core dependency injection

• Fix #46 GetOrAdd and GetOrAddAsync returning nulll if there is already an item with the same key but different type in the cache (PR #106)

Also available from https://www.nuget.org/packages/lazycache

Also available from https://www.nuget.org/packages/lazycache

• BREAKING CHANGE Upgrade to netstandard2.0

• BREAKING CHANGE Change underlying cache from System.Runtime.Caching to Microsft.Extension.Caching.Memory

• BREAKING CHANGE Removed IAppCache.ObjectCache and changed to a cache provider model. To access the provider use IAppCache.CacheProvider. By default we use a singleton shared in-memory cache but add your own cache provider by implmenting the simple ICacheProvider.

• BREAKING CHANGE changed from CacheItemPolicy to MemoryCacheEntryOptions. RemovedCallback is now PostEvictionCallbacks.

• Added a new replaceable global static default cache provider

  Func<ICacheProvider> DefaultCacheProvider { get; }

  By default we use a shared in-memory cache but each instance can have it's underlying cache provider overridden from it's constructor.

• Make methods on CachingService virtual/protected to enable

• Add LazyCache.AspNetCore for dependency injection registration - ServiceCollection.AddLazyCache();

• Update sample to use aspnet core and LazyCache.AspNetCore

• New IAppCache.DefaultCachePolicy to replace CachingService.DefaultCacheDuration

• Moved most CachingService method overloads to extension methods on IAppCache in AppCacheExtensions. API should be backwards compatible but as now extension methods this is technically an API breaking changing.

• Added new methods on IAppCache to allow you to specify cache expiry options on executution of the item factory

  GetOrAdd<T>(string key, Func<ICacheEntry, T> addItemFactory)

  Task<T> GetOrAddAsync<T>(string key, Func<ICacheEntry, Task<T>> addItemFactory)