annotations/Azaion.Common/Services/Cache.cs

using LazyCache;

namespace Azaion.Common.Services;

public interface ICache
{
    T GetFromCache<T>(string key, Func<T> fetchFunc, TimeSpan? expiration = null);
    Task<T> GetFromCacheAsync<T>(string key, Func<Task<T>> fetchFunc, TimeSpan? expiration = null);
    void Invalidate(string key);
}

public class MemoryCache : ICache
{
    private readonly IAppCache _cache = new CachingService();

    public T GetFromCache<T>(string key, Func<T> fetchFunc, TimeSpan? expiration = null)
    {
        expiration ??= TimeSpan.FromHours(4);
        return _cache.GetOrAdd(key, entry =>
        {
            var result = fetchFunc();
            entry.AbsoluteExpirationRelativeToNow = expiration;
            return result;
        });
    }

    public async Task<T> GetFromCacheAsync<T>(string key, Func<Task<T>> fetchFunc, TimeSpan? expiration = null)
    {
        expiration ??= TimeSpan.FromHours(4);
        return await _cache.GetOrAddAsync(key, async entry =>
        {
            var result = await fetchFunc();
            entry.AbsoluteExpirationRelativeToNow = expiration;
            return result;
        });
    }

    public void Invalidate(string key) => _cache.Remove(key);
}