在ASP.NET WebAPI 中使用緩存【Redis】

初步看了下CacheCow與OutputCache，感受仍是CacheOutput比較符合本身的要求，使用也很簡單

PM>Install-Package Strathweb.CacheOutput.WebApi2

基礎使用

CacheOutput特性

        [Route("get")]
        [CacheOutput(ClientTimeSpan = 60, ServerTimeSpan = 60)]
        public IEnumerable<string> Get()
        {
            return new string[] { "Tom", "Irving" };
        }

以參數爲key

        [Route("get")]
        [CacheOutput(ServerTimeSpan = 50, ExcludeQueryStringFromCacheKey = true)]
        public string Get(int id)
        {
            return DateTime.Now.ToString();
        }

Etag頭

使用Redis

客戶端使用StackExchange.Redis，Install-Package StackExchange.Redis.StrongName


在Autofac中註冊Redis鏈接

          var builder = new ContainerBuilder();
            //註冊api容器的實現
            builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
            //註冊mvc容器的實現
            // builder.RegisterControllers(Assembly.GetExecutingAssembly());
            //在Autofac中註冊Redis的鏈接，並設置爲Singleton 
            builder.Register(r =>
            {
                return ConnectionMultiplexer.Connect(DBSetting.Redis);
            }).AsSelf().SingleInstance();
            var container = builder.Build();
            GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);

經過構造注入便可

/// <summary>
    ///Redis服務
    /// </summary>
    public class RedisService : IRedisService
    {
        private static readonly Logger logger = LogManager.GetCurrentClassLogger();

        /// <summary>
        ///Redis服務
        /// </summary>
        private readonly ConnectionMultiplexer _connectionMultiplexer;

        /// <summary>
        /// 構造函數
        /// </summary>
        /// <param name="connectionMultiplexer">Redis服務</param>
        public RedisService(ConnectionMultiplexer connectionMultiplexer)
        {
            _connectionMultiplexer = connectionMultiplexer;
        }

        /// <summary>
        /// 根據KEY得到值
        /// </summary>
        /// <param name="key">key</param>
        /// <returns></returns>
        public async Task<WebAPIResponse> Get(string key)
        {
            try
            {
                var db = _connectionMultiplexer.GetDatabase();
               /*
               var set = await db.StringSetAsync("name", "irving");
               var get = await db.StringGetAsync("name");
               */
                return new WebAPIResponse
                {
                    IsError = false,
                    Msg = string.Empty,
                    Data = await db.StringGetAsync(key)
                };
            }
            catch (Exception ex)
            {
                logger.Error(ex, "RedisService Get Exception : " + ex.Message);
                return new WebAPIResponse
               {
                   IsError = false,
                   Msg = string.Empty,
                   Data = string.Empty
               };
            }
        }
    }

CacheOutput與Redis

默認CacheOutput使用System.Runtime.Caching.MemoryCache來緩存數據，能夠自定義擴展到DB,Memcached,Redis等;只須要實現IApiOutputCache接口

public interface IApiOutputCache
{
    T Get<T>(string key) where T : class;
    object Get(string key);
    void Remove(string key);
    void RemoveStartsWith(string key);
    bool Contains(string key);
    void Add(string key, object o, DateTimeOffset expiration, string dependsOnKey = null);
}

實現服務

/// <summary>
    /// 實現Redis服務
    /// </summary>
    public class RedisCacheProvider : IApiOutputCache
    {
        /// <summary>
        ///Redis服務
        /// </summary>
        private readonly ConnectionMultiplexer _connectionMultiplexer;

        /// <summary>
        /// 構造函數
        /// </summary>
        /// <param name="connectionMultiplexer">Redis服務</param>
        public RedisCacheProvider(ConnectionMultiplexer connectionMultiplexer)
        {
            _connectionMultiplexer = connectionMultiplexer;
        }

        public void Add(string key, object o, DateTimeOffset expiration, string dependsOnKey = null)
        {
            throw new NotImplementedException();
        }

        public IEnumerable<string> AllKeys
        {
            get { throw new NotImplementedException(); }
        }

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

        public object Get(string key)
        {
            var db = _connectionMultiplexer.GetDatabase();
            return db.StringGet(key);
        }

        public T Get<T>(string key) where T : class
        {
            throw new NotImplementedException();
        }

        public void Remove(string key)
        {
            throw new NotImplementedException();
        }

        public void RemoveStartsWith(string key)
        {
            throw new NotImplementedException();
        }
    }

註冊WebAPIConfig

configuration.CacheOutputConfiguration().RegisterCacheOutputProvider(() => RedisCacheProvider);

或者使用Autofac for Web API

var builder = new ContainerBuilder();
builder.RegisterInstance(new RedisCacheProvider());
config.DependencyResolver = new AutofacWebApiDependencyResolver(builder.Build());

REFER:
Lap around Azure Redis Cache
http://azure.microsoft.com/blog/2014/06/04/lap-around-azure-redis-cache-preview/
Caching data in Azure Redis Cache
https://msdn.microsoft.com/en-us/library/azure/dn690521.aspx
ASP.NET Output Cache Provider for Azure Redis Cache
https://msdn.microsoft.com/en-us/library/azure/dn798898.aspx
How to use caching in ASP.NET Web API?
http://stackoverflow.com/questions/14811772/how-to-use-caching-in-asp-net-web-api
Output caching in ASP.NET Web API
http://www.strathweb.com/2012/05/output-caching-in-asp-net-web-api/
NuGet Package of the Week: ASP.NET Web API Caching with CacheCow and CacheOutput
http://www.hanselman.com/blog/NuGetPackageOfTheWeekASPNETWebAPICachingWithCacheCowAndCacheOutput.aspx
使用CacheCow和ETag緩存資源
http://www.cnblogs.com/fzrain/p/3618887.html
ASP.NET WebApi - Use Redis as CacheManager
http://www.codeproject.com/Tips/825904/ASP-NET-WebApi-Use-Redis-as-CacheManager
RedisReact
https://github.com/ServiceStackApps/RedisReact
.Net緩存管理框架CacheManager
http://www.cnblogs.com/JustRun1983/p/CacheManager.html