The cache middleware uses a dependency inversion approach for Redis integration. Instead of directly depending on a specific Redis client library, it defines a RedisClient interface that any Redis implementation can adapt to. This design provides several benefits:

Flexibility: You can use any Redis client library (go-redis, redigo, etc.) by creating an adapter that implements the interface.

Decoupling: The middleware doesn't need to know the specific details of how Redis is accessed.

Testability: Makes it easy to create mocks for unit testing, as demonstrated in the redis.mock example.

Adaptability: If the Redis API changes or if you want to switch to another storage system, you only need to modify the adapter.

Dependency Control: Avoids direct dependencies on external libraries, preventing version conflicts

// Function signature
    app.Use(cache.New())