Using Both (Extend & Override)

REN’s Redis cache service is also built to be overridden and customized—just like the in-memory cache! All the main methods are virtual, which means you can provide your own Redis-specific behavior and business logic whenever you need it.

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How to Override?

1. Create a New Service that Overrides Existing Methods

Inherit from RENRedisCacheService and override any method you wish to customize:

public class ExtendedAndOverridedRENRedisCacheService(IConnectionMultiplexer connectionMultiplexer) : RENRedisCacheService(connectionMultiplexer), IExtendedRENRedisCacheService
{
    public void AdditionalMethod()
    {
        Console.WriteLine("ExtendedAndOverridedRENRedisCacheService AdditionalMethod called.");
        // Implement your additional logic here
    }

    public override void Set<T>(string cacheKey, T data, TimeSpan? absoluteExpiration = null, TimeSpan? slidingExpiration = null)
    {
        Console.WriteLine("ExtendedAndOverridedRENRedisCacheService Set called.");
        // You can add custom logic here before calling the base method
        base.Set(cacheKey, absoluteExpiration, slidingExpiration);
    }
}

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2. Register Your Custom Implementation

Tell the DI container to use your custom service for all cache operations. Register it like this:

builder.Services.AddRENCaching<IExtendedRENRedisCacheService, ExtendedAndOverridedRENRedisCacheService>(RegisterRENCaching.CacheType.Redis);

In this example, OverridedRENRedisCacheService is passed as the generic type parameter TCacheService. The registration method (shown below) ensures your service is used for all Redis cache operations:

public static void AddRENCaching<TICacheService, TCacheService>(this IServiceCollection services, CacheType cacheType, Func<IServiceProvider, IConnectionMultiplexer>? implementationFactory = null, RedisMultiplexerLifetime? multiplexerLifetime = null)
    where TICacheService : class, IRENCacheService
    where TCacheService : class, TICacheService
{
    switch (cacheType)
    {
        case CacheType.InMemory:
            AddInMemoryRENCache<TICacheService, TCacheService>(services);
            break;
        case CacheType.Redis:
            AddRedisRENCache<TICacheService, TCacheService>(services, implementationFactory, multiplexerLifetime.Value);
            break;
        default:
            throw new ArgumentOutOfRangeException(nameof(cacheType), cacheType, null);
    }
}

 private static void AddRedisRENCache<TICacheService, TCacheService>(this IServiceCollection services, Func<IServiceProvider, IConnectionMultiplexer> implementationFactory, RedisMultiplexerLifetime multiplexerLifetime)
     where TICacheService : class, IRENCacheService
     where TCacheService : class, TICacheService
 {
     services.GetBaseRedisInjectImplementations(implementationFactory, multiplexerLifetime);
     services.RegisterRENCacheServices<TICacheService, TCacheService>();
 }
 
private static void GetBaseRedisInjectImplementations(this IServiceCollection services, Func<IServiceProvider, IConnectionMultiplexer> implementationFactory, RedisMultiplexerLifetime multiplexerRuntime)
{
    if (implementationFactory == null)
        throw new ArgumentNullException(nameof(implementationFactory));

    if (multiplexerRuntime == RedisMultiplexerLifetime.Singleton)
        services.AddSingleton<IConnectionMultiplexer>(implementationFactory);
    else if (multiplexerRuntime == RedisMultiplexerLifetime.Scoped)
        services.AddScoped<IConnectionMultiplexer>(implementationFactory);
    else if (multiplexerRuntime == RedisMultiplexerLifetime.Transient)
        services.AddTransient<IConnectionMultiplexer>(implementationFactory);
    else
        throw new ArgumentOutOfRangeException(nameof(multiplexerRuntime), multiplexerRuntime, null);
}

private static IServiceCollection RegisterRENCacheServices<TCacheService>(this IServiceCollection services)
    where TCacheService : IRENCacheService
{
    services.AddScoped(typeof(IRENCacheService), typeof(TCacheService));

    return services;
}

• If you select CacheType.Redis, your overridden class will be registered for all Redis cache actions.

• If you select CacheType.InMemory, it would register for in-memory cache.

• If you pass an unsupported type, you’ll get a clear error.

Pro Tip:

This pattern lets you swap out or customize cache behavior for Redis (or any other provider) simply by changing the type in the registration—no need to touch the rest of your application.

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3. Use Your Overridden Service in Your Application

Now, wherever you inject IRENCacheService, your overridden Redis service will be used:

[Route("api/[controller]")]
[ApiController]
public class ExtendedAndOverridedRedisCacheController(IExtendedRENRedisCacheService cacheService) : ControllerBase
{
    [HttpGet("additional-method")]
    public IActionResult AdditionalMethod(string key)
    {
        cacheService.AdditionalMethod();
        return Ok();
    }

    [HttpPost("set")]
    public IActionResult SetCache([FromQuery] string key, [FromBody] object value)
    {
        cacheService.Set(key, value, TimeSpan.FromMinutes(10));
        return Ok("Value cached.");
    }
}