Camunda定时器事件示例Demo（Timer Events）

Camunda定时器事件（Timer Events）是由定义的计时器触发的事件。它们可以用作启动事件、中间事件或边界事件。边界事件可以中断，也可以不中断。

Camunda定时器事件包括：Timer Start Event（定时启动事件）、Timer Intermediate Catching Event（定时中间捕获事件）、Timer Boundary Event（定时边界事件）。

计时器启动事件Timer Start Event用于在给定时间创建流程实例。它既可以用于应该只启动一次的进程，也可以用于应该在特定时间间隔内启动的进程。子流程不能有计时器启动事件。一旦部署了流程，计时器启动事件就会被调度。没有必要调用startProcessInstanceBy…，尽管调用start进程方法是不受限制的，并且会导致在startProcessInstanceBy的时候再次启动进程…调用。计时器开始事件的XML表示是普通的开始事件声明，带有计时器定义子元素。

计时器边界事件Timer Boundary Event充当秒表和闹钟。当执行到达附加边界事件的活动时，计时器就会启动。当计时器触发时(例如，在指定的时间间隔之后)，活动被中断，然后序列流离开计时器边界事件。中断和非中断计时器事件是有区别的。缺省情况下为中断事件。非中断事件导致原来的活动不被中断，该活动保持在那里。相反，将创建一个额外的执行并在事件的传出转换中发送。

本文重点介绍Timer Start Event（定时启动事件）和Timer Boundary Event（定时边界事件），其它事件请参考camunda官方文档：https://docs.camunda.org/manual/7.15/reference/bpmn20/events/

一、设计流程图

计时器启动事件Timer Start Event节点配置：

      <bpmn:timerEventDefinition id="TimerEventDefinition_14ilbim">

        <bpmn:timeCycle xsi:type="bpmn:tFormalExpression">R2/2022-02-11T09:07/PT1M</bpmn:timeCycle>

      </bpmn:timerEventDefinition>

表示流程将于2022年2月11日09:07(24小时制)开始，以1分钟为间隔，共启动2次。

计时器边界事件Timer Boundary Event节点配置

      <bpmn:timerEventDefinition id="TimerEventDefinition_1epfipx">

        <bpmn:timeDuration xsi:type="bpmn:tFormalExpression">PT3M</bpmn:timeDuration>

      </bpmn:timerEventDefinition>

表示流程在任务一节点超时3分钟未处理将自动流转。

BPMN流程模型文件：

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

<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:modeler="http://camunda.org/schema/modeler/1.0" id="Definitions_1gaqb29" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="4.8.1" modeler:executionPlatform="Camunda Platform" modeler:executionPlatformVersion="7.15.0">

  <bpmn:process id="Process_1hroby5" name="定时器流程" isExecutable="true">

    <bpmn:sequenceFlow id="Flow_0w5epa1" sourceRef="StartEvent_1" targetRef="Activity_1bxm9f3" />

    <bpmn:sequenceFlow id="Flow_0rzgepj" sourceRef="Activity_1bxm9f3" targetRef="Activity_0wkolx8" />

    <bpmn:endEvent id="Event_1avte49">

      <bpmn:incoming>Flow_0a2yjox</bpmn:incoming>

    </bpmn:endEvent>

    <bpmn:sequenceFlow id="Flow_0a2yjox" sourceRef="Activity_0wkolx8" targetRef="Event_1avte49" />

    <bpmn:userTask id="Activity_1bxm9f3" name="任务一" camunda:assignee="demo">

      <bpmn:incoming>Flow_0w5epa1</bpmn:incoming>

      <bpmn:outgoing>Flow_0rzgepj</bpmn:outgoing>

    </bpmn:userTask>

    <bpmn:userTask id="Activity_0wkolx8" name="任务二" camunda:assignee="demo">

      <bpmn:incoming>Flow_0rzgepj</bpmn:incoming>

      <bpmn:incoming>Flow_0gb67p8</bpmn:incoming>

      <bpmn:outgoing>Flow_0a2yjox</bpmn:outgoing>

    </bpmn:userTask>

    <bpmn:startEvent id="StartEvent_1">

      <bpmn:outgoing>Flow_0w5epa1</bpmn:outgoing>

      <bpmn:timerEventDefinition id="TimerEventDefinition_14ilbim">

        <bpmn:timeCycle xsi:type="bpmn:tFormalExpression">R2/2022-02-11T09:07/PT1M</bpmn:timeCycle>

      </bpmn:timerEventDefinition>

    </bpmn:startEvent>

    <bpmn:boundaryEvent id="Event_0m9gmvl" name="超时自动流转" attachedToRef="Activity_1bxm9f3">

      <bpmn:outgoing>Flow_0gb67p8</bpmn:outgoing>

      <bpmn:timerEventDefinition id="TimerEventDefinition_1epfipx">

        <bpmn:timeDuration xsi:type="bpmn:tFormalExpression">PT3M</bpmn:timeDuration>

      </bpmn:timerEventDefinition>

    </bpmn:boundaryEvent>

    <bpmn:sequenceFlow id="Flow_0gb67p8" sourceRef="Event_0m9gmvl" targetRef="Activity_0wkolx8" />

  </bpmn:process>

  <bpmndi:BPMNDiagram id="BPMNDiagram_1">

    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1hroby5">

      <bpmndi:BPMNEdge id="Flow_0a2yjox_di" bpmnElement="Flow_0a2yjox">

        <di:waypoint x="590" y="117" />

        <di:waypoint x="652" y="117" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0rzgepj_di" bpmnElement="Flow_0rzgepj">

        <di:waypoint x="370" y="117" />

        <di:waypoint x="490" y="117" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0w5epa1_di" bpmnElement="Flow_0w5epa1">

        <di:waypoint x="215" y="117" />

        <di:waypoint x="270" y="117" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0gb67p8_di" bpmnElement="Flow_0gb67p8">

        <di:waypoint x="330" y="175" />

        <di:waypoint x="330" y="195" />

        <di:waypoint x="540" y="195" />

        <di:waypoint x="540" y="157" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNShape id="Activity_18kpbpa_di" bpmnElement="Activity_1bxm9f3">

        <dc:Bounds x="270" y="77" width="100" height="80" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Event_1162jaf_di" bpmnElement="StartEvent_1">

        <dc:Bounds x="179" y="99" width="36" height="36" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Activity_1gogmit_di" bpmnElement="Activity_0wkolx8">

        <dc:Bounds x="490" y="77" width="100" height="80" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Event_1avte49_di" bpmnElement="Event_1avte49">

        <dc:Bounds x="652" y="99" width="36" height="36" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Event_0lvm3q2_di" bpmnElement="Event_0m9gmvl">

        <dc:Bounds x="312" y="139" width="36" height="36" />

        <bpmndi:BPMNLabel>

          <dc:Bounds x="347" y="163" width="66" height="14" />

        </bpmndi:BPMNLabel>

      </bpmndi:BPMNShape>

    </bpmndi:BPMNPlane>

  </bpmndi:BPMNDiagram>

</bpmn:definitions>