shark工作流源代码学习（二）

shark工作流源代码学习（二）

 org.enhydra.shark.Shark 在启动Shark引擎前,要对它进行配置,配置要做的操作就是Shark.configure("shark.conf"),下面按先后顺序说明;

1) 整个系统只用配置一次,如果已经配置过,将不会再配置而直接返回,

如下:

 if (isConfigured)

{

SharkEngineManager.getInstance().getCallbackUtilities().info( "Trying to configure shark instance that is already configured !!!");

 return;

}

2)如果没有为配置文件给绝对路径,系统会自动进行获取:

 if (!configFile.isAbsolute()) {

 configFile=configFile.getAbsoluteFile();

}

3)然后就是获取properties,进行配置,并将isConfigured设置为true:

 try {

fis=new FileInputStream(configFile);

Properties props=new Properties();

props.load(fis);

fis.close();

adjustSharkProperties(props);

 } catch (Exception ex) {

throw new Error ("Something went wrong during reading of configuration from the file");

}

isConfigured=true;

4)然后对SharkEngineManager进行配置,它利用回调函数,对该管理器的各子管理器和工厂进行初始化和配置,以后可以直接调用:

 try {

 callbackUtilities=(CallbackUtil)cl.loadClass(cbuClassName).newInstance(); callbackUtilities.setProperties(properties); objectFactory =(SharkObjectFactory)cl.loadClass(objectFactoryClassName).newInstance();

toolAgentManager = (ToolAgentManager) cl.loadClass(tamClassName).newInstance();

xmlInterface=new XMLInterfaceForJDK13();

} catch (Throwable ex) {

throw new Error("Problems instantiating core managers");

}

 5)最后,对系统的缓存和LimitManager进行配置: shark.initCaches(); shark.reevaluateAssignments(); shark.initLimitManager();