如何在 MVC Core 中使用緩存管理器？

Question

我需要在 EF Core 中激活二級緩存，它將查詢結果緩存到下一次，而不是數據庫。

Answer 1

取決於你的項目。 您可以通過多種方式緩存數據：

• 在存儲庫模式中實現緩存
• 在單獨的類中編寫自己的緩存管理器
• 使用類似於 Redis 的系統進行緩存
• ASP.NET Core 中的響應緩存： 此處有詳細信息

Answer 2

這是我的 CacheManager 類

public class CacheManagerAdapter : ICacheService
    {
        private readonly YYYApi _api;
        private ICacheManager<object> _cacheManager;
        private static readonly string _cacheName;

        static CacheManagerAdapter()
        {
            _cacheName = ConfigurationManager.AppSettings["cacheName"] ?? "CancelBookingCache";
        }

        public CacheManagerAdapter(IOptions<YYYApi> options)
        {
            _api = options.Value;

            _cacheManager = CacheFactory.Build("cacheName", settings => settings
                .WithUpdateMode(CacheUpdateMode.Up)
                .WithRedisCacheHandle("redisCache")
                .And.WithRedisConfiguration("redisCache", _api.cacheHost)
                .WithJsonSerializer()
                );
        }

        public void Clear()
        {
            _cacheManager.ClearRegion(_cacheName);
        }

        public bool Contains(string key)
        {
            return _cacheManager.GetCacheItem(key, _cacheName) == null;
        }

        public object Get(string key)
        {
            try
            {
                return _cacheManager.GetCacheItem(key, _cacheName).Value;
            }
            catch (Exception)
            {
                return null;
            }

        }

        public T Get<T>(string key, Func<T> getItemCallback) where T : class
        {
            return _cacheManager.Get<T>(key, _cacheName);
        }

        public void Invalidate(Regex pattern)
        {

            throw new NotImplementedException();
        }

        public void Invalidate(string key)
        {
            _cacheManager.Remove(key, _cacheName);
        }

        public bool IsSet(string key)
        {
            throw new NotImplementedException();
        }

        public void Set(string key, object data, int cacheTime)
        {
            try
            {
                _cacheManager.AddOrUpdate(key, _cacheName, data, x => data);
                if (cacheTime > 0)
                {
                    _cacheManager.Expire(key, _cacheName, ExpirationMode.Absolute, new TimeSpan(0, cacheTime, 0));
                }
            }
            catch (Exception ex)
            {

            }
        }
    }

界面

public interface ICacheService
{
    void Clear();
    bool Contains(string key);
    T Get<T>(string key, Func<T> getItemCallback) where T : class;
    object Get(string key);
    void Invalidate(string key);
    void Invalidate(Regex pattern);
    bool IsSet(string key);
    void Set(string key, object data, int cacheTime);
}

所以這是啟動注入等。

services.AddSingleton<ICacheService, CacheManagerAdapter>();

            services.AddSingleton<IMMMAdapterService>(new MMMAdapterService(
                XXX: new XXXController(
                    services.BuildServiceProvider().GetRequiredService<IOptions<YYYApi>>(),
                    _XXXLogger,
                    _diagnosticContext,
                    new CacheManagerAdapter(services.BuildServiceProvider().GetRequiredService<IOptions<YYYApi>>())
                    ), _XXXLogger, _diagnosticContext));
            services.AddSoapExceptionTransformer((ex) => ex.Message);

最后，注入控制器

private readonly YYYApi _api;
readonly ILogger<XXXController> _logger;
readonly IDiagnosticContext _diagnosticContext;
readonly ICacheService _cache;

public XXXController(IOptions<YYYApi> options, ILogger<XXXController> logger, IDiagnosticContext diagnosticContext, ICacheService cache)
    : base(options, logger)
{
    _api = options.Value;
    _logger = logger;
    _diagnosticContext = diagnosticContext ?? throw new ArgumentNullException(nameof(diagnosticContext));
    _cache = cache;
}