This library extends the Microsoft.Extensions.Caching libraries with the ability to tag and invalidate cache entries.
The main interface for the tagable cache is:
public interface ITagable
{
Task TagAsync(string key, string[] tags, CancellationToken cancellationToken = default);
Task InvalidateAsync(string tag, CancellationToken cancellationToken = default);
Task InvalidateAsync(string[] tags, CancellationToken cancellationToken = default);
}
The TagAsync() is used to associated one or more tags to an already existing entry located at key.
Then later, one can invalidate tags with InvalidateAsync() and in turn delete all keys that were previously tagged.
The tag and invalidation methods are available as extension methods on IDistributedCache.
This caching implementation differs from the Redis implementation of the IDistributedCache in one important way,
namely when both the sliding expiration and the absolute expiration is defined.
The Microsoft implementation allows the sliding expiration to exceed the absolute expiration, where we here treat the absolute expiriation as a finite limit,
so the sliding expiration will never refresh an entry to a later time than configured by the absolute expiration.