本文介绍了Session Facade模式，该模式通过提供统一的服务访问层来管理业务对象，并将其接口暴露给客户端。Session Facade可以作为业务对象与客户端之间的桥梁，在工作流程中使用无状态或有状态会话Bean实现交易控制和缓存控制。
Session Facade:
-- The Session Facade manages the business objects, and provides a uniform service access layer to clients.
-- Expose their interfaces to client tier
-- We can use a session bean as a facade between the business objects and client in a workflow. (Stateless SessionBean/StateFul SessionBean) (transaction control, cache control,)
-- The Session Facade manages the business objects, and provides a uniform service access layer to clients.
-- Expose their interfaces to client tier
-- We can use a session bean as a facade between the business objects and client in a workflow. (Stateless SessionBean/StateFul SessionBean) (transaction control, cache control,)
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