JBoss 系列四十一：jBPM5示例之 Timer Event

阳光穿透心脏的1/2处 2022-01-14 14:09 186阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

在BPM流程中，经常需要在执行某个任务之前或之后停顿一段时间，jBPM5中使用Timer Event完成这一操作，如下为DelayTimerEvent流程：

![04094337_KnPV.jpg][]

如图，DelayTimerEvent流程共有三个节点，Before Timer，Timer，After Timer。Before Timer为Script Task节点，运行状态该节点执行的Java代码如下：

timeBeforeTimer = System.currentTimeMillis(); System.out.println("Before Timer - " + new SimpleDateFormat("yyyyy-mm-dd hh:mm:ss").format( new Date((Long)timeBeforeTimer))); kcontext.setVariable("timeBeforeTimer", timeBeforeTimer);

Timer为Timer Event节点，该节点设定的Timer Delay为5秒钟，即当流程运行到此节点后停顿5秒钟后继续进行。  
After Timer为Script Task节点，运行状态该节点执行的Java代码如下：

Long timeAfter = System.currentTimeMillis(); System.out.println("After Timer - " + new SimpleDateFormat("yyyyy-mm-dd hh:mm:ss").format( new Date(timeAfter))); timerExecutionTime = timeAfter - (Long) timeBeforeTimer; kcontext.setVariable("timerExecutionTime", timerExecutionTime);

*  DelayTimerEvent流程运行代码：[https://github.com/kylinsoong/.../DelayTimerEventStart.java][https_github.com_kylinsoong_..._DelayTimerEventStart.java]
 *  DelayTimerEvent流程：[https://github.com/kylinsoong/.../delayTimerEventProcess.bpmn][https_github.com_kylinsoong_..._delayTimerEventProcess.bpmn]

运行org.jbpm.quickstarts.event.DelayTimerEventStart会运行DelayTimerEvent流程，DelayTimerEventStart代码如下：

package org.jbpm.quickstarts.event; import org.drools.runtime.StatefulKnowledgeSession; import org.drools.runtime.process.ProcessInstance; import org.drools.runtime.process.WorkflowProcessInstance; import org.jbpm.quickstarts.QuickStartBase; public class DelayTimerEventStart extends QuickStartBase { public static void main(String[] args) { new DelayTimerEventStart().test(); } @SuppressWarnings("static-access") public void test() { StatefulKnowledgeSession ksession = createKnowledgeSession("quickstarts/delayTimerEventProcess.bpmn"); ProcessInstance process = ksession.startProcess("org.jbpm.quickstarts.delaytimereventprocess"); try { Thread.currentThread().sleep(6000); } catch (InterruptedException e) { } Long timerExecutionTime = (Long) ((WorkflowProcessInstance)process).getVariable("timerExecutionTime"); System.out.println("The Process Execute Time: " + timerExecutionTime); ksession.dispose(); } }

DelayTimerEvent流程运行输出结果如下：

Before Timer - 02013-20-30 03:20:29 After Timer - 02013-20-30 03:20:34 The Process Execute Time: 5006

如上结果流程执行的时间为5006毫秒，即是由于Timer Delay节点设定5秒钟导致。

转载于:https://my.oschina.net/iwuyang/blog/197146

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/d28e797d92f64e71a4d1775472ea2af1.png
[04094337_KnPV.jpg]: /images/20220114/fc0c526d28fe4cda844dbf28b27d5660.png
[https_github.com_kylinsoong_..._DelayTimerEventStart.java]: https://github.com/kylinsoong/jBPM-Drools-Example/blob/master/jbpm/quickstarts/src/main/java/org/jbpm/quickstarts/event/DelayTimerEventStart.java
[https_github.com_kylinsoong_..._delayTimerEventProcess.bpmn]: https://github.com/kylinsoong/jBPM-Drools-Example/blob/master/jbpm/quickstarts/src/main/resources/quickstarts/delayTimerEventProcess.bpmn