Tag-Based Cache Invalidation & Granular Eviction

1Concept

`HybridCache` allows tagging cached items (e.g. `tags: ["tenant:42", "catalog"]`). Calling `RemoveByTagAsync("catalog")` invalidates all matching cache entries across L1 and L2 simultaneously.

2Architecture Diagram

Cached Keys:
├── "product:1" [Tag: "catalog"]
├── "product:2" [Tag: "catalog"]
└── "user:99"   [Tag: "users"]
       │
hybridCache.RemoveByTagAsync("catalog") ──> Evicts product:1 & product:2 instantly!

3Code Example

using System;

public class TaggedCacheConceptDemo
{
    public static void Main()
    {
        Console.WriteLine("Tag-based cache invalidation enables clean domain-driven cache invalidation across distributed clusters.");
    }
}

4Expected Output

Tag-based cache invalidation enables clean domain-driven cache invalidation across distributed clusters.

5Key Takeaways

• ✓Eliminates complex manual key prefix scanning in Redis.
• ✓Ideal for multi-tenant SaaS applications (`RemoveByTagAsync("tenant:id")`).
• ✓Supported natively in .NET 9.