jbpm的调度应用3-end

最新推荐文章于 2018-04-04 10:54:07 发布

最新推荐文章于 2018-04-04 10:54:07 发布 · 262 阅读

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#JBPM #多线程 #XML #thread

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本文介绍JBPM中定时器(timer)与任务(task)之间的交互机制，包括如何通过配置属性来控制定时器的终止条件，例如指定任务开始、分配或结束时取消定时器。

timer如果在task中，有一个属性cancel-event，可以指定那些事件可以终止timer的执行，默认是task-end，也可以指定多个事件如：<timer duedate="2 business minutes" cancel-event="task-start, task-assign, task-end"></timer>。

下面举一个默认为task-end的例子：

xml 代码

xml version="1.0" encoding="UTF-8"?>
<process-definition xmlns="" name="yytest">
<start-state name="start">
<transition name="" to="a">transition>
start-state>
<task-node name='a'>
<task name='reminder'>
<timer name='reminder' duedate='5 seconds' repeat='3 seconds'
>
<script>System.out.println(new Date()+"----node enter:send mail to operator.");script>
timer>
task>
<transition name="" to="end">transition>
task-node>
<end-state name="end">end-state>
process-definition>

java 代码

package com.jeffentest;
import org.jbpm.*;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.*;
import org.jbpm.scheduler.impl.Scheduler;
public class Jeffentest {
static JbpmConfiguration jbpmConfiguration = JbpmConfiguration.getInstance();
static ProcessDefinition processDefinition = null;
static ProcessInstance processInstance = null;
static Scheduler scheduler = null;
public static void initSchedular() {//设置Schedular的属性
scheduler = new Scheduler();
int interval = 5000;
scheduler.setInterval(interval);
int historyMaxSize = 0;
scheduler.setHistoryMaxSize(historyMaxSize);
scheduler.start();
}
public static void destroy() {//这个例子没用到
scheduler.stop();
}
static class MySchedularThread extends Thread{//实际业务处理线程
public void run(){
JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
try {
long processInstanceId =1;
processInstance = jbpmContext.loadProcessInstance(processInstanceId);
Token token = processInstance.getRootToken();
System.out.println(token.getNode());
//一定要运行到有timer生成，触发
token.signal();
System.out.println(token.getNode());
jbpmContext.save(processInstance);
//jbpm_timer表里有一条数据。timer将永久运行下去，直到taskinstance.end()
Thread.sleep(30*1000);//为模拟效果，此线程停止30秒
jbpmContext.getTaskInstance(1).start();
jbpmContext.getTaskInstance(1).end();//如果，屏蔽掉该句试试
System.out.println(token.getNode());
jbpmContext.save(processInstance);
}catch(Exception e){
e.printStackTrace();
}finally {
jbpmContext.close();
}
}
}
public static void main(String[] args) {
initSchedular ();
MySchedularThread mst=new MySchedularThread();
mst.start();
}
}

运行结果如下：

StartState(start)
TaskNode(a)
Fri Dec 08 11:22:17 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:22:22 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:22:27 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:22:32 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:22:37 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:22:42 CST 2006----node enter:send mail to operator.
EndState(end)

如果想要task启动的时候，timer就终止，可以这样配置

xml 代码

<timer name='reminder' duedate='5 seconds' repeat='3 seconds' cancel-event='task-start'>

结果如下：

StartState(start)
TaskNode(a)
Fri Dec 08 11:35:59 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:36:04 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:36:09 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:36:14 CST 2006----node enter:send mail to operator.
Fri Dec 08 11:36:19 CST 2006----node enter:send mail to operator.
TaskNode(a)

好了调度的应用就说这么多吧。没人了，赶紧去吃饭。