通常，当一个子流程被启动，在离开开始状态的信号被发出之前，所有拥有“read”存取属性的变量都被从超流程载入新创建的子流程；当子流程结束时，所有拥有“write”存取属性的变量都被从子流程拷贝到超流程。variabled元素的mapped-name属性允许你指定在子流程中将使用的变量名称。
相对于上例改动如下
<?xml version="1.0" encoding="UTF-8"?>
<process-definition xmlns="" name="yytest">
<start-state name='yyteststart' >
<transition name='done' to="initial_subyytest" />
</start-state>
<process-state name="initial_subyytest">
<sub-process name="subyytest" />
<variable name="a" access="read,write" mapped-name="aa" />
<variable name="b" access="read" mapped-name="bb" />
<transition name='done' to="yytestend" />
</process-state>
<end-state name="yytestend" />
</process-definition>
---------------------------------------
private static void run(){
JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
try {
long processInstanceId =1;
processInstance = jbpmContext.loadProcessInstance(processInstanceId);
ContextInstance contextInstance = processInstance.getContextInstance();
contextInstance.setVariable("a", "1");
contextInstance.setVariable("b", "1");
System.out.println("主流程变量a:"+contextInstance.getVariable("a"));
System.out.println("主流程变量b:"+contextInstance.getVariable("b"));
Token token = processInstance.getRootToken();
System.out.println(token.getNode());
token.signal();
ProcessInstance subprocessInstance=token.getSubProcessInstance();
/*取得subprocessInstance方法二
long processInstanceId = processInstance.getId();
long subProcessInstanceId = processInstance.getRootToken().getSubProcessInstance().getId();
processInstance = jbpmContext.loadProcessInstance(processInstanceId);
ProcessInstance subprocessInstance = jbpmContext.loadProcessInstance(subProcessInstanceId);
*/
contextInstance = subprocessInstance.getContextInstance();
System.out.println("子流程变量aa:"+contextInstance.getVariable("aa"));
System.out.println("子流程变量bb:"+contextInstance.getVariable("bb"));
contextInstance.setVariable("aa", "2");
contextInstance.setVariable("bb", "2");
Token subtoken = subprocessInstance.getRootToken();
System.out.println(token.getNode());
System.out.println(subtoken.getNode());
subtoken.signal();
contextInstance = processInstance.getContextInstance();
System.out.println("主流程变量a:"+contextInstance.getVariable("a"));
System.out.println("主流程变量b:"+contextInstance.getVariable("b"));
System.out.println(subtoken.getNode());
System.out.println(token.getNode());
jbpmContext.save(processInstance);
}finally {
jbpmContext.close();
}
}
------------------------------
运行结果：
主流程变量a:1
主流程变量b:1
StartState(yyteststart)
子流程变量aa:1
子流程变量bb:1
ProcessState(initial_subyytest)
State(subyyteststate1)
主流程变量a:2
主流程变量b:1
EndState(subyytestend)
EndState(yytestend)
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