工作流引擎Bossa学习

在应用程序调用引擎时，是通过BossaFactory类生成一个对象，并通过此对象创建一个引擎实例：

BossaFactory factory = new BossaFactory();

factory.setStateDir("build/BossaBrowserState");

bossa = factory.createBossa();

包含四个主要的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的源程序，在Jbuilder中跟踪调试，其UML图主要如下: