工作流程引擎Bossa學習

    在應用程式調用引擎時，是通過BossaFactory類產生一個對象，並通過此對象建立一個引擎執行個體：

BossaFactory factory = new BossaFactory();

        factory.setStateDir("build/BossaBrowserState");

        bossa = factory.createBossa();

    包含四個主要的Manger:

        1.caseTypeManager 

* This class manages all registered case types of the workflow

        * system. It provides all the case type life cycle functions and

 * is the entry point of the WFNet package.

        2.resourceManager

        * This class manages the creation and removal of resources.

        * Resources are groups of resources, indexed by a string id.

* Single users are empty resources, their presence indicates the

* id is in use.

        3.workManager

        * This class manages the generation of work item lists.

        4.historian

        * This class keeps the historical records of a Bossa engine. 
    把Bossa的來源程式，在Jbuilder中跟蹤調試，其UML圖主要如下: