Activiti6.0（五）排他网关的使用

目录

一、前言

二、排他网关使用

1、绘制流程图

2、执行排他网关

3、复杂条件判断

---

一、前言

上一篇中有讲到在有多条出线时，可以在流程线上使用流程变量来控制，Activiti的排他网关本质上也是通过给网关后的每条出线设置条件，除去默认出线后然后从上至下进行判断，当条件为true或者无条件时则认为满足，直接执行该条出线，排他网关也允许设置默认出线，即当所有出线都不满足时执行该条默认出线。

从本质上来将，排他网关唯一的优势仅仅是可以在排他网关上设置一系列属性来控制判断顺序，使得整个流程图看起来清晰明了。

二、排他网关使用

1、绘制流程图

这次以报销审批流程为例，当报销费用小于1000时直接走部门经理审批出线，该条出线我直接设置为默认出线，因此线上条件可以不进行设置，当费用大于1000并且小于1500时走总经理审批出线，当大于1500时走董事长审批出线

排他网关的判断顺序也可以设置：

上图代表除去默认出线部门经理审批后，首先判断总经理审批出线的条件是否满足，满足则直接流转。

顺便给出xml文件如下：

<?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" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/processdef">
  <process id="exclusive" name="排他网关测试" isExecutable="true">
    <startEvent id="startEvent1"></startEvent>
    <userTask id="sid-F713E5EC-5EB6-4923-823A-0D490B996316" name="费用报销申请" activiti:candidateUsers="test">
      <extensionElements>
        <modeler:user-info-firstname-test xmlns:modeler="http://activiti.com/modeler"><![CDATA[test]]></modeler:user-info-firstname-test>
        <modeler:activiti-idm-candidate-user xmlns:modeler="http://activiti.com/modeler"><![CDATA[true]]></modeler:activiti-idm-candidate-user>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
      </extensionElements>
    </userTask>
    <exclusiveGateway id="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD" default="sid-084F6369-265A-4D96-BB4D-59E84CD807CD"></exclusiveGateway>
    <userTask id="sid-E11FAB26-51D9-458F-82F8-1AE58674382B" name="部分经理审批" activiti:candidateUsers="admin">
      <extensionElements>
        <modeler:user-info-email-admin xmlns:modeler="http://activiti.com/modeler"><![CDATA[admin]]></modeler:user-info-email-admin>
        <modeler:user-info-lastname-admin xmlns:modeler="http://activiti.com/modeler"><![CDATA[Administrator]]></modeler:user-info-lastname-admin>
        <modeler:activiti-idm-candidate-user xmlns:modeler="http://activiti.com/modeler"><![CDATA[true]]></modeler:activiti-idm-candidate-user>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
      </extensionElements>
    </userTask>
    <userTask id="sid-BEEF4475-13D5-4A8E-9E04-3A452589BBC3" name="总经理审批" activiti:candidateUsers="test">
      <extensionElements>
        <modeler:user-info-firstname-test xmlns:modeler="http://activiti.com/modeler"><![CDATA[test]]></modeler:user-info-firstname-test>
        <modeler:activiti-idm-candidate-user xmlns:modeler="http://activiti.com/modeler"><![CDATA[true]]></modeler:activiti-idm-candidate-user>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
      </extensionElements>
    </userTask>
    <userTask id="sid-B9246DF5-40EB-4D9A-BF58-07E5391C6C58" name="董事长审批" activiti:candidateUsers="test">
      <extensionElements>
        <modeler:user-info-firstname-test xmlns:modeler="http://activiti.com/modeler"><![CDATA[test]]></modeler:user-info-firstname-test>
        <modeler:activiti-idm-candidate-user xmlns:modeler="http://activiti.com/modeler"><![CDATA[true]]></modeler:activiti-idm-candidate-user>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
      </extensionElements>
    </userTask>
    <endEvent id="sid-153A62CA-FAE5-4123-85C3-875FAE7361E7"></endEvent>
    <sequenceFlow id="sid-A29C31A7-AF17-4B31-972F-53ACC7C0DAE3" sourceRef="startEvent1" targetRef="sid-F713E5EC-5EB6-4923-823A-0D490B996316"></sequenceFlow>
    <sequenceFlow id="sid-A9D7094B-636A-49C9-877D-0A456A21A3A5" sourceRef="sid-F713E5EC-5EB6-4923-823A-0D490B996316" targetRef="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD"></sequenceFlow>
    <sequenceFlow id="sid-7E8068C4-BDAA-4596-8465-6674E2A1B8AD" sourceRef="sid-BEEF4475-13D5-4A8E-9E04-3A452589BBC3" targetRef="sid-153A62CA-FAE5-4123-85C3-875FAE7361E7"></sequenceFlow>
    <sequenceFlow id="sid-BD130ADC-D94C-4332-9FBB-EC05554EF9EA" sourceRef="sid-B9246DF5-40EB-4D9A-BF58-07E5391C6C58" targetRef="sid-153A62CA-FAE5-4123-85C3-875FAE7361E7"></sequenceFlow>
    <sequenceFlow id="sid-24D74804-6EB7-426A-88D4-B622CC042178" sourceRef="sid-E11FAB26-51D9-458F-82F8-1AE58674382B" targetRef="sid-153A62CA-FAE5-4123-85C3-875FAE7361E7"></sequenceFlow>
    <sequenceFlow id="sid-084F6369-265A-4D96-BB4D-59E84CD807CD" name="默认出线" sourceRef="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD" targetRef="sid-E11FAB26-51D9-458F-82F8-1AE58674382B"></sequenceFlow>
    <sequenceFlow id="sid-AA4D4312-5345-40CB-98D6-E28B700D49AA" name="费用大于1000小于1500" sourceRef="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD" targetRef="sid-BEEF4475-13D5-4A8E-9E04-3A452589BBC3">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${money >= 1000 && money <= 1500}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="sid-A910EEF7-72DD-4371-9E1A-5AE5C82D90B6" name="费用大于1500" sourceRef="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD" targetRef="sid-B9246DF5-40EB-4D9A-BF58-07E5391C6C58">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${money > 1500}]]></conditionExpression>
    </sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_exclusive">
    <bpmndi:BPMNPlane bpmnElement="exclusive" id="BPMNPlane_exclusive">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
        <omgdc:Bounds height="30.0" width="30.0" x="100.0" y="163.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-F713E5EC-5EB6-4923-823A-0D490B996316" id="BPMNShape_sid-F713E5EC-5EB6-4923-823A-0D490B996316">
        <omgdc:Bounds height="80.0" width="100.0" x="178.0" y="135.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-B2A37F07-424D-4797-A7C6-65E15AB760FD" id="BPMNShape_sid-B2A37F07-424D-4797-A7C6-65E15AB760FD">
        <omgdc:Bounds height="40.0" width="40.0" x="389.0" y="155.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-E11FAB26-51D9-458F-82F8-1AE58674382B" id="BPMNShape_sid-E11FAB26-51D9-458F-82F8-1AE58674382B">
        <omgdc:Bounds height="80.0" width="100.0" x="509.0" y="15.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-BEEF4475-13D5-4A8E-9E04-3A452589BBC3" id="BPMNShape_sid-BEEF4475-13D5-4A8E-9E04-3A452589BBC3">
        <omgdc:Bounds height="80.0" width="100.0" x="509.0" y="138.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-B9246DF5-40EB-4D9A-BF58-07E5391C6C58" id="BPMNShape_sid-B9246DF5-40EB-4D9A-BF58-07E5391C6C58">
        <omgdc:Bounds height="80.0" width="100.0" x="510.0" y="255.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-153A62CA-FAE5-4123-85C3-875FAE7361E7" id="BPMNShape_sid-153A62CA-FAE5-4123-85C3-875FAE7361E7">
        <omgdc:Bounds height="28.0" width="28.0" x="750.0" y="164.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="sid-A9D7094B-636A-49C9-877D-0A456A21A3A5" id="BPMNEdge_sid-A9D7094B-636A-49C9-877D-0A456A21A3A5">
        <omgdi:waypoint x="278.0" y="175.0"></omgdi:waypoint>
        <omgdi:waypoint x="389.0" y="175.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-084F6369-265A-4D96-BB4D-59E84CD807CD" id="BPMNEdge_sid-084F6369-265A-4D96-BB4D-59E84CD807CD">
        <omgdi:waypoint x="420.5740740740741" y="166.57407407407408"></omgdi:waypoint>
        <omgdi:waypoint x="509.37344398340247" y="95.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-7E8068C4-BDAA-4596-8465-6674E2A1B8AD" id="BPMNEdge_sid-7E8068C4-BDAA-4596-8465-6674E2A1B8AD">
        <omgdi:waypoint x="609.0" y="178.0"></omgdi:waypoint>
        <omgdi:waypoint x="750.0" y="178.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-A910EEF7-72DD-4371-9E1A-5AE5C82D90B6" id="BPMNEdge_sid-A910EEF7-72DD-4371-9E1A-5AE5C82D90B6">
        <omgdi:waypoint x="420.0907407407407" y="183.90925925925927"></omgdi:waypoint>
        <omgdi:waypoint x="510.0" y="255.29900332225913"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-A29C31A7-AF17-4B31-972F-53ACC7C0DAE3" id="BPMNEdge_sid-A29C31A7-AF17-4B31-972F-53ACC7C0DAE3">
        <omgdi:waypoint x="129.99471655268036" y="177.60191018001734"></omgdi:waypoint>
        <omgdi:waypoint x="178.0" y="176.3274336283186"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-BD130ADC-D94C-4332-9FBB-EC05554EF9EA" id="BPMNEdge_sid-BD130ADC-D94C-4332-9FBB-EC05554EF9EA">
        <omgdi:waypoint x="610.0" y="266.3235294117647"></omgdi:waypoint>
        <omgdi:waypoint x="751.855601632158" y="184.96516965214465"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-24D74804-6EB7-426A-88D4-B622CC042178" id="BPMNEdge_sid-24D74804-6EB7-426A-88D4-B622CC042178">
        <omgdi:waypoint x="609.0" y="85.0"></omgdi:waypoint>
        <omgdi:waypoint x="751.9950990400243" y="170.79705942401463"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-AA4D4312-5345-40CB-98D6-E28B700D49AA" id="BPMNEdge_sid-AA4D4312-5345-40CB-98D6-E28B700D49AA">
        <omgdi:waypoint x="428.1875" y="175.8125"></omgdi:waypoint>
        <omgdi:waypoint x="509.0" y="177.16387959866222"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

2、执行排他网关

具体使用时与上一篇一模一样，也是在执行到费用报销审批环节时，给money变量设值然后完成当前任务，Activiti会自动检索网关出口，从上到下进行条件判断，满足时退出，注意条件为空时认为满足。

@Test
    public void exclusiveGatewayTest() {
        // 1、发布流程
        Deployment deployment = repositoryService.createDeployment().name("排他网关流程").addClasspathResource("processes/exclusiveGateway.bpmn20.xml").deploy();

        // 2、启动一个流程实例
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("exclusive");

        // 3、查询所有任务
        List<Task> tasks = taskService.createTaskQuery().processInstanceId(processInstance.getProcessInstanceId()).list();

        Task task = tasks.get(0);
        // 4、完成费用报销审批环节任务的同时设置流程变量，来告诉Activiti该走哪条线
        Map<String, Object> variables = new HashMap<>();
        variables.put("money", 1600);
        taskService.complete(task.getId(), variables);
    }

可自己通过修改money变量的值来测试流程流转情况，当然实际在使用时，业务方只需利用流程线的条件，关于具体值可自行存储。

3、复杂条件判断

在实际使用时，我们的判断条件可能很复杂，涉及到很多业务逻辑，仅仅依靠${}中的条件表达式可能无法满足，此时可以在花括号中加入自定义服务类的自定义判断方法，如${conditionService.checkCondition(execution)}，execution为Activiti的一个接口，流转判断时会自动注入，conditionService也需要交给Spring管理，即加上@Service注解

自定义类如下：

@Service
@Slf4j
public class ConditionService {

    public boolean checkCondition(Execution execution) {
        ExecutionEntity executionEntity = (ExecutionEntity) execution;
        // 此处可以做业务判断
        log.info("tacheId:{}", executionEntity.getActivityId());
        log.info("tacheName:{}", executionEntity.getCurrentFlowElement().getName());
        return true;
    }
}

然后再对应流程线的判断条件上也修改为${conditionService.checkCondition(execution)}，接着执行即可。

由于每次都返回了true，正好也可以验证下排他网关的执行顺序，上面可知网关除去默认出线后，先从总经理审批开始判断，那么完成后当前的任务也应该是总经理审批才对~

查看数据库的当前任务数据也是正确无误~