使用Camunda流程引擎，关于并行网关（Parallel Gateway）使用-CFANZ编程社区

在使用开源Camunda流程引擎做二次开发时，网关是必须要接触的。在Camunda的 Modeler工具中提供了4种类型的网关：Exclusive Gateway（独占网关）、Parallel Gateway（并行网关）、Inclusive Gateway（包容性网关）、Event-based Gateway（基于事件的网关），每一个网关都有自己独特的功能，这一篇就先介绍 Parallel Gateway（并行网关）。

Parallel Gateway（并行网关）

大概意思是：

并行网关的功能基于传入和传出序列流：

叉子：所有传出序列流都并行遵循，为每个序列流创建一个并发执行。
连接：所有到达并行网关的并发执行都在网关等待，直到每个传入序列流的执行到达。然后这个过程继续通过连接网关。

重要提醒：与其他网关类型的一个重要区别是并行网关不评估条件。如果在与并行网关连接的序列流上定义条件，则会忽略它们。所以并行网关最重要的作用是连接。

流程实例

场景：公司里有请假的流程，先是组长审批，然后是经理审批、人事审批，只有都审批通过了，才会结束。

请假流程图：

并行网关不需要对节点做参数配置，做直接部署测试。

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:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:modeler="http://camunda.org/schema/modeler/1.0" id="Definitions_1yxxu28" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="4.11.1" modeler:executionPlatform="Camunda Platform" modeler:executionPlatformVersion="7.15.0">

  <bpmn:process id="Process_0d8i21k" name="并行网关示例" isExecutable="true">
    <bpmn:startEvent id="StartEvent_1">
      <bpmn:outgoing>Flow_1dx1ok0</bpmn:outgoing>
    </bpmn:startEvent>
    <bpmn:parallelGateway id="Gateway_1vx1coa">

      <bpmn:incoming>Flow_0l0abn3</bpmn:incoming>

      <bpmn:outgoing>Flow_18egz2b</bpmn:outgoing>

      <bpmn:outgoing>Flow_0oed7gb</bpmn:outgoing>

    </bpmn:parallelGateway>

    <bpmn:sequenceFlow id="Flow_1dx1ok0" sourceRef="StartEvent_1" targetRef="Activity_1dut7sm" />

    <bpmn:endEvent id="Event_0rb2ozq">

      <bpmn:incoming>Flow_0ipw6rw</bpmn:incoming>

    </bpmn:endEvent>

    <bpmn:userTask id="Activity_1dut7sm" name="组长审批">

      <bpmn:incoming>Flow_1dx1ok0</bpmn:incoming>

      <bpmn:outgoing>Flow_0l0abn3</bpmn:outgoing>

    </bpmn:userTask>

    <bpmn:userTask id="Activity_1kl1xky" name="人事审批">

      <bpmn:incoming>Flow_0oed7gb</bpmn:incoming>

      <bpmn:outgoing>Flow_0ww5lb2</bpmn:outgoing>

    </bpmn:userTask>

    <bpmn:userTask id="Activity_0072g8y" name="经理审批">

      <bpmn:incoming>Flow_18egz2b</bpmn:incoming>

      <bpmn:outgoing>Flow_0aystu5</bpmn:outgoing>

    </bpmn:userTask>

    <bpmn:sequenceFlow id="Flow_0l0abn3" sourceRef="Activity_1dut7sm" targetRef="Gateway_1vx1coa" />

    <bpmn:parallelGateway id="Gateway_0xd48it">

      <bpmn:incoming>Flow_0aystu5</bpmn:incoming>

      <bpmn:incoming>Flow_0ww5lb2</bpmn:incoming>

      <bpmn:outgoing>Flow_0ipw6rw</bpmn:outgoing>

    </bpmn:parallelGateway>

    <bpmn:sequenceFlow id="Flow_18egz2b" sourceRef="Gateway_1vx1coa" targetRef="Activity_0072g8y" />

    <bpmn:sequenceFlow id="Flow_0oed7gb" sourceRef="Gateway_1vx1coa" targetRef="Activity_1kl1xky" />

    <bpmn:sequenceFlow id="Flow_0aystu5" sourceRef="Activity_0072g8y" targetRef="Gateway_0xd48it" />

    <bpmn:sequenceFlow id="Flow_0ww5lb2" sourceRef="Activity_1kl1xky" targetRef="Gateway_0xd48it" />

    <bpmn:sequenceFlow id="Flow_0ipw6rw" sourceRef="Gateway_0xd48it" targetRef="Event_0rb2ozq" />

  </bpmn:process>

  <bpmndi:BPMNDiagram id="BPMNDiagram_1">

    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_0d8i21k">

      <bpmndi:BPMNEdge id="Flow_1dx1ok0_di" bpmnElement="Flow_1dx1ok0">

        <di:waypoint x="148" y="210" />

        <di:waypoint x="250" y="210" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0l0abn3_di" bpmnElement="Flow_0l0abn3">

        <di:waypoint x="350" y="210" />

        <di:waypoint x="455" y="210" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_18egz2b_di" bpmnElement="Flow_18egz2b">

        <di:waypoint x="480" y="185" />

        <di:waypoint x="480" y="120" />

        <di:waypoint x="580" y="120" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0oed7gb_di" bpmnElement="Flow_0oed7gb">

        <di:waypoint x="480" y="235" />

        <di:waypoint x="480" y="280" />

        <di:waypoint x="580" y="280" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0aystu5_di" bpmnElement="Flow_0aystu5">

        <di:waypoint x="680" y="120" />

        <di:waypoint x="770" y="120" />

        <di:waypoint x="770" y="185" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0ww5lb2_di" bpmnElement="Flow_0ww5lb2">

        <di:waypoint x="680" y="280" />

        <di:waypoint x="770" y="280" />

        <di:waypoint x="770" y="235" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge id="Flow_0ipw6rw_di" bpmnElement="Flow_0ipw6rw">

        <di:waypoint x="795" y="210" />

        <di:waypoint x="902" y="210" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNShape id="Activity_1kl1xky_di" bpmnElement="Activity_1kl1xky">

        <dc:Bounds x="580" y="240" width="100" height="80" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Activity_0072g8y_di" bpmnElement="Activity_0072g8y">

        <dc:Bounds x="580" y="80" width="100" height="80" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Gateway_19csdge_di" bpmnElement="Gateway_1vx1coa">

        <dc:Bounds x="455" y="185" width="50" height="50" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">

        <dc:Bounds x="112" y="192" width="36" height="36" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Activity_1dut7sm_di" bpmnElement="Activity_1dut7sm">

        <dc:Bounds x="250" y="170" width="100" height="80" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Event_0rb2ozq_di" bpmnElement="Event_0rb2ozq">

        <dc:Bounds x="902" y="192" width="36" height="36" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="Gateway_035arq3_di" bpmnElement="Gateway_0xd48it">

        <dc:Bounds x="745" y="185" width="50" height="50" />

      </bpmndi:BPMNShape>

    </bpmndi:BPMNPlane>

  </bpmndi:BPMNDiagram>

</bpmn:definitions>