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SequenceFlow.md

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SequenceFlow

Sequence flow behaviour.

Conditional flows

All outbound sequence flows can have conditions. Flows are evaluated in sequence. Default flow will be taken if no other flow was taken.

Example source:

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <process id="theProcess" isExecutable="true">
    <task id="task1" default="to-task2" />
    <sequenceFlow id="to-task2" sourceRef="task1" targetRef="task2" />
    <sequenceFlow id="to-task3" sourceRef="task1" targetRef="task3" />
    <sequenceFlow id="to-task4" sourceRef="task1" targetRef="task4">
      <conditionExpression xsi:type="tFormalExpression" language="javascript">next(null, this.environment.variables.take4);</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="to-task5" sourceRef="task1" targetRef="task5">
      <conditionExpression xsi:type="tFormalExpression">${environment.variables.take5}</conditionExpression>
    </sequenceFlow>
    <task id="task2" />
    <task id="task3" />
    <task id="task4" />
    <task id="task5" />
  </process>
</definitions>`;

Sequence flows:

  • to-task2: default flow. If no other flow was taken then default flow is taken
  • to-task3: unconditional. Flow is taken
  • to-task4: script condition. Callback (next) is called with environment variable as result. If result is truthy the flow is taken, otherwise discarded
  • to-task5: expression condition. Expression will be evaluated and passed as result. If result is truthy the flow is taken, otherwise discarded