中台服务分层架构

 1、接口适配层：

方式一：动态调用RPC数据服务

方式二：基于策略模式，动态加载dll实现，例如

	        /// <summary>
        /// 获得广告位置列表
        /// </summary>
        /// <param name="pageSize">每页数</param>
        /// <param name="pageNumber">当前页数</param>
        /// <returns></returns>
        IDataReader GetAdvertPositionList(int pageSize, int pageNumber);

        static BMAData()
        {
            try
            {
                string[] fileNameList = Directory.GetFiles(System.Web.HttpRuntime.BinDirectory, "TMall.RDBSStrategy.*.dll", SearchOption.TopDirectoryOnly);
                _irdbsstrategy = (IRDBSStrategy)Activator.CreateInstance(Type.GetType(string.Format("TMall.RDBSStrategy.{0}.RDBSStrategy, TMall.RDBSStrategy.{0}", fileNameList[0].Substring(fileNameList[0].LastIndexOf("RDBSStrategy.") + 13).Replace(".dll", "")),
                                                                                            false,
                                                                                            true));
            }
            catch
            {
                throw new BMAException("创建'关系数据库策略对象'失败,可能存在的原因:未将'关系数据库策略程序集'添加到bin目录中;'关系数据库策略程序集'文件名不符合'TMall.RDBSStrategy.{策略名称}.dll'格式");
            }
            _enablednosql = Directory.GetFiles(System.Web.HttpRuntime.BinDirectory, "TMall.NOSQLStrategy.*.dll", SearchOption.TopDirectoryOnly).Length > 0;
        }

        /// <summary>
        /// 关系型数据库
        /// </summary>
        public static IRDBSStrategy RDBS
        {
            get { return _irdbsstrategy; }
        }

        /// <summary>
        /// 用户非关系型数据库
        /// </summary>
        public static IUserNOSQLStrategy UserNOSQL
        {
            get
            {
                if (_enablednosql && BMAConfig.RedisNOSQLConfig.User.Enabled == 1)
                {
                    if (_iusernosqlstrategy == null)
                    {
                        lock (_locker)
                        {
                            if (_iusernosqlstrategy == null)
                            {
                                try
                                {
                                    string[] fileNameList = Directory.GetFiles(System.Web.HttpRuntime.BinDirectory, "TMall.NOSQLStrategy.*.dll", SearchOption.TopDirectoryOnly);
                                    _iusernosqlstrategy = (IUserNOSQLStrategy)Activator.CreateInstance(Type.GetType(string.Format("TMall.NOSQLStrategy.{0}.UserNOSQLStrategy, TMall.NOSQLStrategy.{0}", fileNameList[0].Substring(fileNameList[0].LastIndexOf("NOSQLStrategy.") + 14).Replace(".dll", "")),
                                                                                                                          false,
                                                                                                                          true));
                                }
                                catch
                                {
                                    throw new BMAException("创建'用户非关系数据库策略对象'失败,可能存在的原因:未将'用户非关系数据库策略程序集'添加到bin目录中;'用户非关系数据库策略程序集'文件名不符合'TMall.NOSQLStrategy.{策略名称}.dll'格式");
                                }
                            }
                        }
                    }
                }
                return _iusernosqlstrategy;
            }
        }