Overriding Existing Methods

REN’s Redis cache service is just as extensible and developer-friendly as its in-memory counterpart. You can override any method to enhance functionality, add logging, or integrate your own custom logic—perfect for advanced, distributed, or enterprise scenarios.

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How to Override Redis Cache Methods

1. Create Your Own Redis Cache Service

Simply inherit from RENRedisCacheService and override any method you want to customize:

public class OverridedRENRedisCacheService(IConnectionMultiplexer connectionMultiplexer) 
    : RENRedisCacheService(connectionMultiplexer)
{
    public override async Task<T> GetAsync<T>(string cacheKey, CancellationToken cancellationToken = default)
    {
        Console.WriteLine($"OverridedRENRedisCacheService GetAsync called with cacheKey: {cacheKey}");
        // You can add custom logic here before calling the base method
        return await base.GetAsync<T>(cacheKey, cancellationToken);
    }
}

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2. Register Your Custom Redis Implementation

Register your new cache service in the DI container using REN’s extension method:

builder.Services.AddRENCaching<OverridedRENRedisCacheService>(CacheType.Redis, redisMultiplexerProvider, RedisMultiplexerLifetime.Singleton); // comment this out if not used

This tells REN to use your OverridedRENRedisCacheService for all Redis-based cache operations.

How Does Registration Work?

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

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

• CacheType.Redis: Registers your custom Redis cache implementation.

• CacheType.InMemory: Registers your in-memory cache if needed.

• Others: Throws for unsupported types.

Pro Tip:

This pattern allows you to fine-tune distributed caching, add enterprise-grade features (like custom serialization, advanced key handling, or cross-server sync), and future-proof your app without touching business logic elsewhere.

1. Use Your Custom Service in Practice

[Route("api/[controller]")]
[ApiController]
public class OverridedCacheController(IRENCacheService cacheService) : ControllerBase
{
    [HttpGet("get")]
    public async Task<IActionResult> GetCacheValueAsync(string key)
    {
        var value = await cacheService.GetAsync<string>(key);
        return Ok(value);
    }
}

That’s it! With REN, extending or replacing default Redis cache behaviors is quick, clean, and fully integrated into the DI system. Just register and go!