Activiti之 Exclusive Gateway

一、Exclusive Gateway

　　Exclusive Gateway（也称为XOR网关或更多技术基于数据的排他网关）经常用做决定流程的流转方向。当流程到达该网关的时候，所有的流出序列流到按照已定义好的顺序依次执行。当序列流条件的求值结果为true(或没有条件集的时候,在概念上有定义一个“true”定义序列流)，就会选择该序列继续的处理。Exclusive Gateway的图标就是菱形里面有一个X符合，如下所示：

　　

　　XML的代码为：

<exclusiveGateway id="exclusiveGw" name="Exclusive Gateway" />

<sequenceFlow id="flow2" sourceRef="exclusiveGw" targetRef="theTask1">
  <conditionExpression xsi:type="tFormalExpression">${input == 1}</conditionExpression>
</sequenceFlow>

<sequenceFlow id="flow3" sourceRef="exclusiveGw" targetRef="theTask2">
  <conditionExpression xsi:type="tFormalExpression">${input == 2}</conditionExpression>
</sequenceFlow>

<sequenceFlow id="flow4" sourceRef="exclusiveGw" targetRef="theTask3">
  <conditionExpression xsi:type="tFormalExpression">${input == 3}</conditionExpression>
</sequenceFlow>

 二、示例

　　本例子以请假流程为例，流程设计图如下图所示：

　　

　　当员工提出的请假时间大于2天的时候由总经理审批，当请假时间不大于2天的时候由经理审批。

　　1、leave.bpmn内容如下： 

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <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/test">
  3   <process id="leave" name="请假流程图" isExecutable="true">
  4     <documentation>请假流程图</documentation>
  5     <startEvent id="startevent1" name="Start"></startEvent>
  6     <endEvent id="endevent1" name="End"></endEvent>
  7     <!-- ${employeeId} 中的employeeId 在启动流程实例的时候，就设置employeeId变量。再根据employeeId获取员工请假任务，最后设置请假时间进行提交-->
  8     <userTask id="usertask1" name="员工请假" activiti:assignee="${employeeId}"></userTask>
  9     <userTask id="usertask2" name="经理审批" activiti:candidateGroups="manager"></userTask>
 10     <userTask id="usertask3" name="总经理审批" activiti:candidateGroups="boss"></userTask>
 11     <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
 12     <sequenceFlow id="flow2" name="${flag == true}" sourceRef="usertask2" targetRef="endevent1">
 13       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == true}]]></conditionExpression>
 14     </sequenceFlow>
 15     <sequenceFlow id="flow3" name="${flag == true}" sourceRef="usertask3" targetRef="endevent1">
 16       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == true}]]></conditionExpression>
 17     </sequenceFlow>
 18     <sequenceFlow id="flow4" name="${flag == false}" sourceRef="usertask2" targetRef="usertask1">
 19       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == false}]]></conditionExpression>
 20     </sequenceFlow>
 21     <sequenceFlow id="flow5" name="${flag == false}" sourceRef="usertask3" targetRef="usertask1">
 22       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == false}]]></conditionExpression>
 23     </sequenceFlow>
 24     <exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
 25     <sequenceFlow id="flow6" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
 26     <sequenceFlow id="flow7" name="${day &lt;= 2}" sourceRef="exclusivegateway1" targetRef="usertask2">
 27       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${day <= 2}]]></conditionExpression>
 28     </sequenceFlow>
 29     <sequenceFlow id="flow8" name="${day &gt; 2}" sourceRef="exclusivegateway1" targetRef="usertask3">
 30       <conditionExpression xsi:type="tFormalExpression"><![CDATA[${day > 2}]]></conditionExpression>
 31     </sequenceFlow>
 32   </process>
 33   <bpmndi:BPMNDiagram id="BPMNDiagram_leave">
 34     <bpmndi:BPMNPlane bpmnElement="leave" id="BPMNPlane_leave">
 35       <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
 36         <omgdc:Bounds height="35.0" width="35.0" x="355.0" y="48.0"></omgdc:Bounds>
 37       </bpmndi:BPMNShape>
 38       <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
 39         <omgdc:Bounds height="35.0" width="35.0" x="355.0" y="362.0"></omgdc:Bounds>
 40       </bpmndi:BPMNShape>
 41       <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
 42         <omgdc:Bounds height="55.0" width="105.0" x="320.0" y="112.0"></omgdc:Bounds>
 43       </bpmndi:BPMNShape>
 44       <bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
 45         <omgdc:Bounds height="55.0" width="105.0" x="170.0" y="240.0"></omgdc:Bounds>
 46       </bpmndi:BPMNShape>
 47       <bpmndi:BPMNShape bpmnElement="usertask3" id="BPMNShape_usertask3">
 48         <omgdc:Bounds height="55.0" width="105.0" x="480.0" y="242.0"></omgdc:Bounds>
 49       </bpmndi:BPMNShape>
 50       <bpmndi:BPMNShape bpmnElement="exclusivegateway1" id="BPMNShape_exclusivegateway1">
 51         <omgdc:Bounds height="40.0" width="40.0" x="352.0" y="247.0"></omgdc:Bounds>
 52       </bpmndi:BPMNShape>
 53       <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
 54         <omgdi:waypoint x="372.0" y="83.0"></omgdi:waypoint>
 55         <omgdi:waypoint x="372.0" y="112.0"></omgdi:waypoint>
 56       </bpmndi:BPMNEdge>
 57       <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
 58         <omgdi:waypoint x="222.0" y="295.0"></omgdi:waypoint>
 59         <omgdi:waypoint x="222.0" y="379.0"></omgdi:waypoint>
 60         <omgdi:waypoint x="355.0" y="379.0"></omgdi:waypoint>
 61         <bpmndi:BPMNLabel>
 62           <omgdc:Bounds height="14.0" width="100.0" x="183.0" y="309.0"></omgdc:Bounds>
 63         </bpmndi:BPMNLabel>
 64       </bpmndi:BPMNEdge>
 65       <bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
 66         <omgdi:waypoint x="532.0" y="297.0"></omgdi:waypoint>
 67         <omgdi:waypoint x="532.0" y="379.0"></omgdi:waypoint>
 68         <omgdi:waypoint x="390.0" y="379.0"></omgdi:waypoint>
 69         <bpmndi:BPMNLabel>
 70           <omgdc:Bounds height="14.0" width="100.0" x="483.0" y="309.0"></omgdc:Bounds>
 71         </bpmndi:BPMNLabel>
 72       </bpmndi:BPMNEdge>
 73       <bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
 74         <omgdi:waypoint x="222.0" y="240.0"></omgdi:waypoint>
 75         <omgdi:waypoint x="222.0" y="139.0"></omgdi:waypoint>
 76         <omgdi:waypoint x="320.0" y="139.0"></omgdi:waypoint>
 77         <bpmndi:BPMNLabel>
 78           <omgdc:Bounds height="14.0" width="100.0" x="170.0" y="191.0"></omgdc:Bounds>
 79         </bpmndi:BPMNLabel>
 80       </bpmndi:BPMNEdge>
 81       <bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5">
 82         <omgdi:waypoint x="532.0" y="242.0"></omgdi:waypoint>
 83         <omgdi:waypoint x="532.0" y="139.0"></omgdi:waypoint>
 84         <omgdi:waypoint x="425.0" y="139.0"></omgdi:waypoint>
 85         <bpmndi:BPMNLabel>
 86           <omgdc:Bounds height="14.0" width="100.0" x="485.0" y="191.0"></omgdc:Bounds>
 87         </bpmndi:BPMNLabel>
 88       </bpmndi:BPMNEdge>
 89       <bpmndi:BPMNEdge bpmnElement="flow6" id="BPMNEdge_flow6">
 90         <omgdi:waypoint x="372.0" y="167.0"></omgdi:waypoint>
 91         <omgdi:waypoint x="372.0" y="247.0"></omgdi:waypoint>
 92       </bpmndi:BPMNEdge>
 93       <bpmndi:BPMNEdge bpmnElement="flow7" id="BPMNEdge_flow7">
 94         <omgdi:waypoint x="352.0" y="267.0"></omgdi:waypoint>
 95         <omgdi:waypoint x="275.0" y="267.0"></omgdi:waypoint>
 96         <bpmndi:BPMNLabel>
 97           <omgdc:Bounds height="14.0" width="100.0" x="283.0" y="247.0"></omgdc:Bounds>
 98         </bpmndi:BPMNLabel>
 99       </bpmndi:BPMNEdge>
100       <bpmndi:BPMNEdge bpmnElement="flow8" id="BPMNEdge_flow8">
101         <omgdi:waypoint x="392.0" y="267.0"></omgdi:waypoint>
102         <omgdi:waypoint x="480.0" y="269.0"></omgdi:waypoint>
103         <bpmndi:BPMNLabel>
104           <omgdc:Bounds height="14.0" width="100.0" x="400.0" y="247.0"></omgdc:Bounds>
105         </bpmndi:BPMNLabel>
106       </bpmndi:BPMNEdge>
107     </bpmndi:BPMNPlane>
108   </bpmndi:BPMNDiagram>
109 </definitions>

　　2、测试类LeaveTest代码如下：

  1 package com.shh.test;
  2 
  3 import java.util.HashMap;
  4 import java.util.List;
  5 import java.util.Map;
  6 
  7 import org.activiti.engine.HistoryService;
  8 import org.activiti.engine.ProcessEngine;
  9 import org.activiti.engine.ProcessEngineConfiguration;
 10 import org.activiti.engine.RepositoryService;
 11 import org.activiti.engine.RuntimeService;
 12 import org.activiti.engine.TaskService;
 13 import org.activiti.engine.history.HistoricProcessInstanceQuery;
 14 import org.activiti.engine.task.Task;
 15 import org.junit.Before;
 16 import org.junit.Test;
 17 /**
 18  * 请假流程
 19  */
 20 public class LeaveTest {
 21     ProcessEngine processEngine = null;
 22     RepositoryService repositoryService = null;
 23     RuntimeService runtimeService = null;
 24     TaskService taskService = null; 
 25 
 26     /**
 27      * 加载配置文件
 28      */
 29     @Before
 30     public void init() {
 31         processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("activiti.cfg.xml")
 32                 .buildProcessEngine();
 33         repositoryService = processEngine.getRepositoryService();
 34         runtimeService = processEngine.getRuntimeService();
 35         taskService = processEngine.getTaskService();
 36     }
 37 
 38     /**
 39      * 部署流程定义
 40      */
 41     @Test
 42     public void deploy(){
 43         repositoryService.createDeployment().addClasspathResource("diagrams/leave.bpmn").deploy();
 44         System.out.println("***************部署流程定义完成***************");
 45     }
 46     
 47     /**
 48      * 启动一个请假流程
 49      */
 50     @Test
 51     public void start() {
 52         Map<String, Object> variables = new HashMap<String, Object>();
 53         variables.put("employeeId", "Kermit"); //请假人
 54         String processId = runtimeService.startProcessInstanceByKey("leave", variables).getId();
 55         System.out.println("***************启动一个请假流程完成***************" + processId);
 56     }
 57 
 58     /**
 59      * 提交请假申请
 60      */
 61     @Test
 62     public void apply(){
 63         System.out.println("***************提交请假申请开始***************");
 64         List<Task> tasks = taskService.createTaskQuery().taskAssignee("Kermit").list();
 65         System.out.println(tasks.size());
 66         for (Task task : tasks) {
 67             System.out.println("Kermit的任务taskname:" + task.getName() + ",id:" + task.getId());
 68             taskService.setVariable(task.getId(), "day", 4);//设置请假天数
 69             taskService.complete(task.getId());//完成任务  
 70             System.out.println("请假4 天");
 71         }
 72         System.out.println("***************提交请假申请完成***************");
 73     }
 74     
 75     @Test
 76     public void step2manager() {
 77         System.out.println("***************经理组审批流程开始***************");
 78         List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("manager").list();// 经理组的任务
 79         System.out.println("经理组的任务：" + tasks.size());
 80         for (Task task : tasks) {
 81             System.out.println("经理组的任务taskname:" + task.getName() + ",id:" + task.getId());
 82             taskService.claim(task.getId(), "李四");//申领任务 
 83             taskService.setVariable(task.getId(), "flag", false);//true批准，false不批准
 84             Object applyUser = taskService.getVariable(task.getId(), "employeeId");
 85             Object day = taskService.getVariable(task.getId(), "day");
 86             System.out.println(String.format("%s请假%s天", applyUser, day));
 87             taskService.complete(task.getId());//完成任务 
 88         }
 89         System.out.println("***************经理组审批流程结束***************");
 90     }
 91     
 92     @Test
 93     public void step2Boss() {
 94         System.out.println("***************总经理组审批流程开始***************");
 95         List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("boss").list();// 总经理组的任务
 96         System.out.println("总经理组的任务：" + tasks.size());
 97         for (Task task : tasks) {
 98             System.out.println("manager的任务taskname:" + task.getName() + ",id:" + task.getId());
 99             taskService.claim(task.getId(), "王五");//申领任务 
100             taskService.setVariable(task.getId(), "flag", true);//true批准,false不批准
101             Object applyUser = taskService.getVariable(task.getId(), "employeeId");
102             Object day = taskService.getVariable(task.getId(), "day");
103             System.out.println(String.format("%s请假%s天", applyUser, day));
104             taskService.complete(task.getId());//完成任务 
105         }
106         System.out.println("***************总经理组审批流程结束***************");
107     }
108 }

　　依次运行deploy()、start()、apply()方法之后，因为申请的请假天数为4天，所以流程已经到了总经理角色，此时运行step2Boss()方法，一个完整的请假流程就已经完成。运行结果如下图所示：

　　

　　也可对代码进行修改，总经理不批准

　taskService.setVariable(task.getId(), "flag", false);

　流程就回到员工那里，员工继续申请，设置天数为2
taskService.setVariable(task.getId(), "day", 4);//设置请假天数

　　此时流程到达经理角色，经理批准，流程也就结束

　taskService.setVariable(task.getId(), "flag", true);
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原文地址：https://www.cnblogs.com/always-online/p/4702394.html