我的SCA之旅开始了。

    因为工作上的内容，使得我们需要在中间数据集方面深入，相关内容搜索的过程中，发现了SDO(Service Data Objects)，继而了解了SCA(Service Component Architecture)，发觉自己应该步入这闪大门，以此来结束我对其他技术方面的追求。

    从在WAS(Websphere Application Server)上寻找Timer和Worker，发现了IBM和BEA在背后搞CommonJ，继而对CommonJ的了解使我认识到了SDO，又因为中间数据集的内容深入，使我最终开始了我的SCA之旅。

    简单介绍一下两个概念 SCA 和 SDO。

    Service Component Architecture (SCA) is a set of specifications which describe a model for building applications and systems using a Service-Oriented Architecture. SCA extends and complements prior approaches to implementing services, and SCA builds on open standards such as Web services.

    Service Data Objects (SDO) is designed to simplify and unify the way in which applications handle data. Using SDO, application programmers can uniformly access and manipulate data from heterogeneous data sources, including relational databases, XML data sources, Web services, and enterprise information systems. 

    补充一张SCA的图，否则看得太无聊了吧。