一个JBPM实现互斥撤回任务的例子

        有一个需求是这个样子的:员工请假,填写好请假单后,提交申请.上级主管会有一个审核请假的任务,同时申请人有一个撤回的任务.这这两个任务互斥,也就是说两个任务有一个先执行.另一个任务取消.
       曾经看过网上一篇文章使用分支节点创建两个任务节点.当一个任务节点执行后写一个action类负责结束另一个任务节点.达到互斥撤回的效果.本人试验过确实可以完成.
       不过这不符合我们常规的流程定义方式(需要增加一对分支,联合节点).并且不符合jbpm关于节点描述.
       jbpm认为一个节点代表流程中的一个等待状态.显然领导审核和员工撤销请假处于同一个等待状态,也应该处于一个节点中.使用一对分支,联合节点的方式虽然形式上处于一个等待状态.但这样的流程设计是不合适的.
       可以这样设计这个互斥回撤节点

<task-node name="审核" signal="first" end-tasks="true"><task name="审核员工请假" swimlane="boss" template="apply_2.ftl"><controller><variable name="reason" access="read" mapped-name="reason"><variable name="day" access="read,write" mapped-name="day"><variable name="applyman" access="read" mapped-name="applyman"> </variable></variable></variable></controller></task></task-node>

xml 代码

<task-node name="审核" signal="first" end-tasks="true">
        <task name="审核员工请假" swimlane="boss" template="apply_2.ftl">
    <controller>
          <variable name="reason" access="read" mapped-name="reason"/>
         <variable name="day" access="read,write" mapped-name="day"/>
         <variable name="applyman" access="read" mapped-name="applyman"/>
         <variable name="decision" access="read,write" mapped-name="decision"/>
       <!---->controller>
   <!---->task>
    <task name="撤回请假单" swimlane="applyman" template="apply_3_new.ftl">
    <controller>
          <variable name="reason" access="read" mapped-name="reason"/>
         <variable name="day" access="read" mapped-name="day"/>
         <variable name="applyman" access="read" mapped-name="applyman"/>
         <variable name="decision" access="read,write" mapped-name="decision"/>
       <!---->controller>
   <!---->task>

     <transition name="结束" to="归档"><!---->transition>
     <transition name="撤销" to="请假结束"><!---->transition>
     <transition name="修改" to="修改"><!---->transition>
  <!---->task-node>

<task name="撤回请假单" swimlane="applyman" template="apply_3_new.ftl"><controller><variable name="reason" access="read" mapped-name="reason"><task-node name="审核"><task template="apply_2.ftl" swimlane="boss" name="审核员工请假"><controller><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read,write" name="day"><task template="apply_3_new.ftl" swimlane="applyman" name="撤回请假单"><controller><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read" name="day">

这个节点包含了我们刚才说的两个任务.我们知道当流传到这个节点的时候.这两个任务会同时创建并分配给各自的人员.有一个人完成任务后 节点向指定的节点转向.同时结束另一个任务.    signal="first" 有一个任务结束节点就流转.  end-tasks="true" 结束该节点的时候自动结束其他没有完成的任务.

       这是个小例子没什么特别.可能早有高人知晓.在这我只是感觉到jbpm对节点是流程的一个等待状态这个含义,对我们设计流程有重要的意义.欢迎大家指正批评

   完整的xml流程定义.如果你要部署这个流程.这里需要说明的是</variable></variable></controller></task></variable></variable></controller></task></task-node></variable></controller></task><variable name="reason" access="read" mapped-name="reason"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read,write" name="day"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read" name="day">com.jbpmexample.jbpm.Assignment类是我自己的授权类.你自己写一个代替就好了,</variable></variable></variable></variable></variable><variable name="reason" access="read" mapped-name="reason"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read,write" name="day"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read" name="day">template="apply_1.ftl"  这样的属性是我自己加的 为了实现显示页面的定制.需要去掉.否则部署的时候会报错</variable></variable></variable></variable></variable><task name="撤回请假单" swimlane="applyman" template="apply_3_new.ftl"><controller><variable name="reason" access="read" mapped-name="reason"><task-node name="审核"><task template="apply_2.ftl" swimlane="boss" name="审核员工请假"><controller><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read,write" name="day"><task template="apply_3_new.ftl" swimlane="applyman" name="撤回请假单"><controller><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read" name="day">

xml 代码

<?xml version="1.0" encoding="UTF-8"?>

<process-definition
  xmlns="urn:jbpm.org:jpdl-3.1"  name="新请假流程">
  <swimlane name="applyman" />

  <swimlane name="boss">
    <assignment class="com.jbpmexample.jbpm.Assignment">
         <swimlaneName>boss</swimlaneName>
      </assignment>
  </swimlane>

   <start-state name="请假开始">
    <task name="填写请假单" swimlane="applyman" <variable name="reason" access="read" mapped-name="reason"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read,write" name="day"><variable mapped-name="reason" access="read" name="reason"><variable mapped-name="day" access="read" name="day">template="apply_1.ftl"</variable></variable></variable></variable></variable>>
        <controller>
          <variable name="reason" access="read,write" mapped-name="reason"/>
          <variable name="day" access="read,write" mapped-name="day"/>
          <variable name="applyman" access="read,write" mapped-name="applyman"/>
        </controller>
    </task>
      <transition name="结束" to="审核"></transition>
   </start-state>
   <task-node name="审核" signal="first" end-tasks="true">
        <task name="审核员工请假" swimlane="boss" template="apply_2.ftl">
        <controller>
           <variable name="reason" access="read" mapped-name="reason"/>
          <variable name="day" access="read,write" mapped-name="day"/>
          <variable name="applyman" access="read" mapped-name="applyman"/>
          <variable name="decision" access="read,write" mapped-name="decision"/>
        </controller>
    </task>
        <task name="撤回请假单" swimlane="applyman" template="apply_3_new.ftl">
        <controller>
           <variable name="reason" access="read" mapped-name="reason"/>
          <variable name="day" access="read" mapped-name="day"/>
          <variable name="applyman" access="read" mapped-name="applyman"/>
          <variable name="decision" access="read,write" mapped-name="decision"/>
        </controller>
    </task>

      <transition name="结束" to="归档"></transition>
      <transition name="撤销" to="请假结束"></transition>
      <transition name="修改" to="修改"></transition>
   </task-node>
   <task-node name="归档">
        <task name="请假归档" swimlane="applyman" template="apply_4.ftl">
        <controller>
           <variable name="reason" access="read" mapped-name="reason"/>
          <variable name="day" access="read" mapped-name="day"/>
          <variable name="applyman" access="read" mapped-name="applyman"/>
          <variable name="decision" access="read" mapped-name="decision"/>
        </controller>
    </task>
      <transition name="结束" to="请假结束"></transition>
   </task-node>
   <end-state name="请假结束"></end-state>

   <task-node name="修改">
   <task name="修改" swimlane="applyman" template="apply_1.ftl">
        <controller>
           <variable name="reason" access="read,write" mapped-name="reason"/>
          <variable name="day" access="read,write" mapped-name="day"/>
          <variable name="applyman" access="read" mapped-name="applyman"/>
        </controller>
    </task>
      <transition name="结束" to="审核"></transition>
   </task-node>
</process-definition>

</variable></variable></controller></task></variable></variable></controller></task></task-node></variable></controller></task>

评论

2 楼 上杉t 2007-03-14  

我可以给你个完整的流程定义.其实例子你主要看看jbpm自带的例子就可以.在你的服务器部署好跑跑看看代码.好好阅读一下官方的文档.虽然讲的不深,不过该提到的都点了一下.对那个地方有兴趣就要自己试了.

1 楼 whzresponse 2007-03-14  

楼主,你能否给我一个完整的例子,我这两天学习jbpm,感觉很吃力, 一个完整的例子都没有,不知道如何下手了，谈下你的经验吧?谢谢了， email和msn:[e-mail]