工作流中各个元素介绍之工作流开始和结束事件详解

2021-04-19  本文已影响0人  攻城狮Chova

开始事件

 try {
 identityService.setAuthenticatedUserId("bono");
 runtimeService.startProcessInstanceByKey("someProcessKey");
} finally {
 identityService.setAuthenticatedUserId(null);
}

空开始事件

描述
ProcessInstance processInstance = runtimeService.startProcessInstanceByXXX();
图形标记
XML结构
<startEvent id="start" name="my start event" />
空开始事件的自定义扩展
<startEvent id="request" activiti:formKey="org/activiti/examples/taskforms/request.form" />

定时开始事件

描述
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XML内容
        <startEvent id="theStart">
            <timerEventDefinition>
                <!--流程会启动4次,每次间隔5分钟,从2011年3月11日,12:13开始计时-->
                <timeCycle>R4/2011-03-11T12:13/PT5M</timeCycle>
            </timerEventDefinition>
        </startEvent>

        <startEvent id="theStart">
            <timerEventDefinition>
                <!--流程会根据选中的时间启动一次-->
                <timeDate>2011-03-11T12:13:14</timeDate>
            </timerEventDefinition>
        </startEvent>

消息开始事件

描述
ProcessInstance startProcessInstanceByMessage(String messageName);
ProcessInstance startProcessInstanceByMessage(String messageName, Map<String, Object> processVariables);
ProcessInstance startProcessInstanceByMessage(String messageName, String businessKey, Map<String, Object< processVariables);
图形标记
XML内容
<definitions id="definitions"
  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
  xmlns:activiti="http://activiti.org/bpmn"
  targetNamespace="Examples"
  xmlns:tns="Examples">

  <message id="newInvoice" name="newInvoiceMessage" />

  <process id="invoiceProcess">

    <startEvent id="messageStart" >
        <messageEventDefinition messageRef="tns:newInvoice" />
    </startEvent>
    ...
  </process>

</definitions>

信号开始事件

描述
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XML格式
 <signal id="theSignal" name="The Signal" />

    <process id="processWithSignalStart1">
        <startEvent id="theStart">
          <signalEventDefinition id="theSignalEventDefinition" signalRef="theSignal"  />
        </startEvent>
        <sequenceFlow id="flow1" sourceRef="theStart" targetRef="theTask" />
        <userTask id="theTask" name="Task in process A" />
        <sequenceFlow id="flow2" sourceRef="theTask" targetRef="theEnd" />
        <endEvent id="theEnd" />
    </process>

错误开始事件

描述
图形标记
XML内容
<startEvent id="messageStart" >
        <errorEventDefinition errorRef="someError" />
</startEvent>

结束事件

空结束事件

描述
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XML内容
<endEvent id="end" name="my end event" />

错误结束事件

描述
图形标记
XML内容
<endEvent id="myErrorEndEvent">
  <errorEventDefinition errorRef="myError" />
</endEvent>

<error id="myError" errorCode="123" />
...
<process id="myProcess">
...

<error id="myError" errorCode="error123" />
...
<process id="myProcess">
...
  <endEvent id="myErrorEndEvent">
    <errorEventDefinition errorRef="myError" />
  </endEvent>

等同于

<endEvent id="myErrorEndEvent">
  <errorEventDefinition errorRef="error123" />
</endEvent>

取消结束事件

描述
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XML内容
<endEvent id="myCancelEndEvent">
  <cancelEventDefinition />
</endEvent>

边界事件

<boundaryEvent id="myBoundaryEvent" attachedToRef="theActivity">
      <XXXEventDefinition/>
</boundaryEvent>

定时边界事件

描述
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XML内容
<boundaryEvent id="escalationTimer" cancelActivity="true" attachedToRef="firstLineSupport">
   <timerEventDefinition>
    <timeDuration>PT4H</timeDuration>
  </timerEventDefinition>
</boundaryEvent>
边界事件的问题

错误边界事件

描述
图形标记
XML内容
<boundaryEvent id="catchError" attachedToRef="mySubProcess">
  <errorEventDefinition errorRef="myError"/>
</boundaryEvent>

<error id="myError" errorCode="123" />
...
<process id="myProcess">
...
错误边界事件实例

信号边界事件

描述
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XML内容
<boundaryEvent id="boundary" attachedToRef="task" cancelActivity="true">
          <signalEventDefinition signalRef="alertSignal"/>
</boundaryEvent>

消息边界事件

描述
图形标记
XML内容
<boundaryEvent id="boundary" attachedToRef="task" cancelActivity="true">
          <messageEventDefinition messageRef="newCustomerMessage"/>
</boundaryEvent>

取消边界事件

描述
图形标记
XML内容
<boundaryEvent id="boundary" attachedToRef="transaction" >
          <cancelEventDefinition />
</boundaryEvent>

补偿边界事件

描述
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XML内容
<boundaryEvent id="compensateBookHotelEvt" attachedToRef="bookHotel" >
          <compensateEventDefinition />
</boundaryEvent>

<association associationDirection="One" id="a1"  sourceRef="compensateBookHotelEvt" targetRef="undoBookHotel" />

<serviceTask id="undoBookHotel" isForCompensation="true" activiti:class="..." />

中间捕获事件

<intermediateCatchEvent id="myIntermediateCatchEvent" >
      <XXXEventDefinition/>
</intermediateCatchEvent>

定时中间捕获事件

描述
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XML内容
        <intermediateCatchEvent id="timer">
            <timerEventDefinition>
                <timeDuration>PT5M</timeDuration>
            </timerEventDefinition>
        </intermediateCatchEvent>

信号中间捕获事件

图形标记

XML内容
<intermediateCatchEvent id="signal">
        <signalEventDefinition signalRef="newCustomerSignal" />
</intermediateCatchEvent>

消息中间捕获事件

描述
图形标记
XML内容
<intermediateCatchEvent id="message">
        <messageEventDefinition signalRef="newCustomerMessage" />
</intermediateCatchEvent>

内部触发事件

<intermediateThrowEvent id="myIntermediateThrowEvent" >
      <XXXEventDefinition/>
</intermediateThrowEvent>
中间触发空事件
<intermediateThrowEvent id="noneEvent">
  <extensionElements>
    <activiti:executionListener class="org.activiti.engine.test.bpmn.event.IntermediateNoneEventTest$MyExecutionListener" event="start" />
  </extensionElements>
</intermediateThrowEvent>

信号中间触发事件

描述
图形标记
XML内容
<intermediateThrowEvent id="signal">
        <signalEventDefinition signalRef="newCustomerSignal" />
</intermediateThrowEvent>

<intermediateThrowEvent id="signal">
        <signalEventDefinition signalRef="newCustomerSignal" activiti:async="true" />
</intermediateThrowEvent>

补偿中间触发事件

描述
 已知限制:
 1. waitForCompletion="false"还不支持。当补偿使用中间触发补偿事件触发时， 事件没有等待，在补偿成功结束后
 2. 补偿自己由并发分支执行。并发分支的执行顺序与被补偿的节点完成次序相反。 未来activiti可能支持选项来顺序执行补偿
 3. 补偿不会传播给callActivity调用的子流程实例
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XML内容
<intermediateThrowEvent id="throwCompensation">
        <compensateEventDefinition />
</intermediateThrowEvent>

<intermediateThrowEvent id="throwCompensation">
        <compensateEventDefinition activityRef="bookHotel" />
</intermediateThrowEvent>
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