GM.Caching 1.2.0

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GM.Caching

A small, provider-agnostic caching abstraction for .NET. Depend on one interface — ICacheService — with typed get/set, GetOrCreateAsync (single-flight, no cache stampede), and absolute/sliding expiration. Ships an in-memory implementation; add a distributed backend with GM.Caching.Redis. Targets .NET 10.

Packages

The two packages version and release together (lockstep):

dotnet add package GM.Caching          # in-memory
dotnet add package GM.Caching.Redis    # + Redis backend

Quick start

In-memory

using GM.Caching;

builder.Services.AddGMCaching();               // optionally: o => o.KeyPrefix = "myapp:"

Redis

using GM.Caching.Redis;

builder.Services.AddGMRedisCaching(o =>
{
    o.ConnectionString = "localhost:6379";
    o.KeyPrefix = "myapp:";
});
// or bind from configuration: builder.Services.AddGMRedisCaching(builder.Configuration, "Redis");

It replaces the in-memory cache if AddGMCaching() ran first (GM.API registers it by default), so the order of the two calls doesn't matter; any other ICacheService you registered still wins.

Or let configuration decide: AddGMCaching(configuration) registers Redis when Redis:ConnectionString is set and the in-memory cache otherwise, so the same code runs on one instance or many.

Use it

Inject ICacheService — the same code works with either backend:

public class WeatherService(ICacheService cache, IWeatherApi api)
{
    public Task<Forecast> GetAsync(string city) =>
        cache.GetOrCreateAsync(
            $"forecast:{city}",
            ct => api.FetchAsync(city, ct),
            CacheEntryOptions.Absolute(TimeSpan.FromMinutes(10)));
}

GetOrCreateAsync is single-flight: if many callers ask for the same missing key at once, the factory runs once and everyone gets that result — no stampede on your database or upstream API.

The interface

Task<T?>  GetAsync<T>(string key, CancellationToken ct = default);
Task      SetAsync<T>(string key, T value, CacheEntryOptions? options = null, CancellationToken ct = default);
Task<T>   GetOrCreateAsync<T>(string key, Func<CancellationToken, Task<T>> factory, CacheEntryOptions? options = null, CancellationToken ct = default);
Task<bool> ExistsAsync(string key, CancellationToken ct = default);
Task      RemoveAsync(string key, CancellationToken ct = default);

CacheEntryOptions.Absolute(ttl) / CacheEntryOptions.Sliding(window) set per-entry expiration; CacheServiceOptions.KeyPrefix and DefaultAbsoluteExpiration apply provider-wide. The Redis provider JSON-serializes values and refreshes the key TTL on read for sliding entries.

Repository layout

GM.Caching/              # ICacheService, options, in-memory implementation
GM.Caching.Redis/        # Redis implementation (StackExchange.Redis)
tests/GM.Caching.Tests/  # xUnit tests for the in-memory cache

Building & testing

dotnet build -c Release
dotnet test  -c Release

Releasing

Versioning is automated from Conventional Commits — see CONTRIBUTING.md. Both packages share one version (Directory.Build.props) and publish together to nuget.org on each release.

License

MIT — see LICENSE.