@Override
public void execute(ActionExecutionContext exctx)
throws ModelException, SCXMLExpressionException {
// 得到资源文件路径
final URL url = this.getClass().getClassLoader().getResource(getSrc());
SCXML scxml = null;
// 根据src的值，启动状态机
try {
scxml = SCXMLReader.read(url);
} catch (Exception e) {
System.out.println("couldn't find :" + getSrc());
e.printStackTrace();
}
for (int i = 0; i < getInstances(); i++) {
Evaluator evaluator = EvaluatorFactory.getEvaluator(scxml);
SCXMLExecutionContext currentExecutionContext =
(SCXMLExecutionContext) exctx.getInternalIOProcessor();
SCXMLInstanceTree instanceTree = currentExecutionContext.getInstanceTree();
SCXMLExecutor executor =
new SCXMLExecutor(evaluator, null, new SimpleErrorReporter(), null, instanceTree);
executor.setStateMachine(scxml);
// 设置引擎执行的根上下文
Context rootContext = evaluator.newContext(null);
executor.setRootContext(rootContext);
// 开始启动流程
executor.go();
// 维护关系
String currentSessionId =
(String)
currentExecutionContext
.getScInstance()
.getSystemContext()
.get(SCXMLSystemContext.SESSIONID_KEY);
String subStateMachineSessionId =
(String)
executor.getGlobalContext().getSystemContext().get(SCXMLSystemContext.SESSIONID_KEY);
instanceTree.insert(
currentSessionId, subStateMachineSessionId, executor.getStateMachine().getName());
// 将当前的Executor加入到 实例管理器里面
SCXMLInstanceManager.setSCXMLInstance(executor);
}
}
/**
* @param state an EnterableState
* @return Returns the context for an EnterableState
*/
public Context getContext(EnterableState state) {
return exctx.getScInstance().getContext(state);
}
/** @return Returns the global context */
public Context getGlobalContext() {
return exctx.getScInstance().getGlobalContext();
}