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(0);
            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*60);
                _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