基于Redis的CustomerSessionProvider（二）

接一的考虑，那么就做Redis的SessionProvider就非常简单了，只考虑整个Session的缓存，主要实现以下两个函数就可以了

         public override SessionStateStoreData GetItem(System.Web.HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions)
         {
             OpenRedis();
             var response = _connection.Strings.Get(_dbNumber, id);
             var value = _connection.Wait(response);
             var sessionItems = value.FromBinary<SerializableSessionStateItemCollection>();

             locked = false;
             lockAge = new TimeSpan();
             lockId = null;
             actions = SessionStateActions.None;

             SessionStateStoreData storeData = null;
             if (sessionItems != null)
             {
                 storeData = new SessionStateStoreData(sessionItems, SessionStateUtility.GetSessionStaticObjects(context), _timeout);
             }
             else
             {
                 storeData = new SessionStateStoreData(new SerializableSessionStateItemCollection(), SessionStateUtility.GetSessionStaticObjects(context), _timeout);
             }
             return storeData;
         }

         public override SessionStateStoreData GetItemExclusive(System.Web.HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions)
         {
             return GetItem(context, id, out locked, out lockAge, out lockId, out actions);
         }

         public override void SetAndReleaseItemExclusive(System.Web.HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem)
         {
             OpenRedis();
             var items = item.Items as SerializableSessionStateItemCollection;
             if (items != null)
             {
                 var response = _connection.Strings.Set(_dbNumber, id, item.Items.ToBinary(), _timeout*);
                 _connection.Wait(response);
             }
         }

配置Web.Config

      <sessionState mode="Custom" customProvider="redis" timeout="20">
          <providers>
              <add name="redis" type=".Web.Session.RedisSessionProvider,Common.Web" server="localhost" port ="6379" dbNumber="2"/>
          </providers>
      </sessionState>

调试通过，包括设置和获取Session，Session超时，Session Aband，基本达到要求，美中不足的是，存入Session的对象必须标记可序列化的。

经测试发现，每次Request，都会调用上面的2个函数，用户量大的时候，redis会有点压力