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：
<?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/test">
<process id="leave" name="请假流程图" isExecutable="true">
<documentation>请假流程图</documentation>
<startEvent id="startevent1" name="Start"></startEvent>
<endEvent id="endevent1" name="End"></endEvent>
<!-- ${employeeId} 中的employeeId 在启动流程实例的时候，就设置employeeId变量。再根据employeeId获取员工请假任务，最后设置请假时间进行提交-->
<userTask id="usertask1" name="员工请假" activiti:assignee="${employeeId}"></userTask>
<userTask id="usertask2" name="经理审批" activiti:candidateGroups="manager"></userTask>
<userTask id="usertask3" name="总经理审批" activiti:candidateGroups="boss"></userTask>
<sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
<sequenceFlow id="flow2" name="${flag == true}" sourceRef="usertask2" targetRef="endevent1">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == true}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow3" name="${flag == true}" sourceRef="usertask3" targetRef="endevent1">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == true}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow4" name="${flag == false}" sourceRef="usertask2" targetRef="usertask1">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == false}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow5" name="${flag == false}" sourceRef="usertask3" targetRef="usertask1">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${flag == false}]]></conditionExpression>
</sequenceFlow>
<exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
<sequenceFlow id="flow6" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
<sequenceFlow id="flow7" name="${day <= 2}" sourceRef="exclusivegateway1" targetRef="usertask2">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${day <= 2}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow8" name="${day > 2}" sourceRef="exclusivegateway1" targetRef="usertask3">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${day > 2}]]></conditionExpression>
</sequenceFlow>
</process>
<bpmndi:BPMNDiagram id="BPMNDiagram_leave">
<bpmndi:BPMNPlane bpmnElement="leave" id="BPMNPlane_leave">
<bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
<omgdc:Bounds height="35.0" width="35.0" x="355.0" y="48.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
<omgdc:Bounds height="35.0" width="35.0" x="355.0" y="362.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
<omgdc:Bounds height="55.0" width="105.0" x="320.0" y="112.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="usertask2" id="BPMNShape_usertask2">
<omgdc:Bounds height="55.0" width="105.0" x="170.0" y="240.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="usertask3" id="BPMNShape_usertask3">
<omgdc:Bounds height="55.0" width="105.0" x="480.0" y="242.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="exclusivegateway1" id="BPMNShape_exclusivegateway1">
<omgdc:Bounds height="40.0" width="40.0" x="352.0" y="247.0"></omgdc:Bounds>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
<omgdi:waypoint x="372.0" y="83.0"></omgdi:waypoint>
<omgdi:waypoint x="372.0" y="112.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
<omgdi:waypoint x="222.0" y="295.0"></omgdi:waypoint>
<omgdi:waypoint x="222.0" y="379.0"></omgdi:waypoint>
<omgdi:waypoint x="355.0" y="379.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="183.0" y="309.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow3" id="BPMNEdge_flow3">
<omgdi:waypoint x="532.0" y="297.0"></omgdi:waypoint>
<omgdi:waypoint x="532.0" y="379.0"></omgdi:waypoint>
<omgdi:waypoint x="390.0" y="379.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="483.0" y="309.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow4" id="BPMNEdge_flow4">
<omgdi:waypoint x="222.0" y="240.0"></omgdi:waypoint>
<omgdi:waypoint x="222.0" y="139.0"></omgdi:waypoint>
<omgdi:waypoint x="320.0" y="139.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="170.0" y="191.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow5" id="BPMNEdge_flow5">
<omgdi:waypoint x="532.0" y="242.0"></omgdi:waypoint>
<omgdi:waypoint x="532.0" y="139.0"></omgdi:waypoint>
<omgdi:waypoint x="425.0" y="139.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="485.0" y="191.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow6" id="BPMNEdge_flow6">
<omgdi:waypoint x="372.0" y="167.0"></omgdi:waypoint>
<omgdi:waypoint x="372.0" y="247.0"></omgdi:waypoint>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow7" id="BPMNEdge_flow7">
<omgdi:waypoint x="352.0" y="267.0"></omgdi:waypoint>
<omgdi:waypoint x="275.0" y="267.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="283.0" y="247.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="flow8" id="BPMNEdge_flow8">
<omgdi:waypoint x="392.0" y="267.0"></omgdi:waypoint>
<omgdi:waypoint x="480.0" y="269.0"></omgdi:waypoint>
<bpmndi:BPMNLabel>
<omgdc:Bounds height="14.0" width="100.0" x="400.0" y="247.0"></omgdc:Bounds>
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>
2、测试类LeaveTest代码如下：
package com.shh.test; import java.util.HashMap;
import java.util.List;
import java.util.Map; import org.activiti.engine.HistoryService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngineConfiguration;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.history.HistoricProcessInstanceQuery;
import org.activiti.engine.task.Task;
import org.junit.Before;
import org.junit.Test;
/**
* 请假流程
*/
public class LeaveTest {
ProcessEngine processEngine = null;
RepositoryService repositoryService = null;
RuntimeService runtimeService = null;
TaskService taskService = null; /**
* 加载配置文件
*/
@Before
public void init() {
processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromResource("activiti.cfg.xml")
.buildProcessEngine();
repositoryService = processEngine.getRepositoryService();
runtimeService = processEngine.getRuntimeService();
taskService = processEngine.getTaskService();
} /**
* 部署流程定义
*/
@Test
public void deploy(){
repositoryService.createDeployment().addClasspathResource("diagrams/leave.bpmn").deploy();
System.out.println("***************部署流程定义完成***************");
} /**
* 启动一个请假流程
*/
@Test
public void start() {
Map<String, Object> variables = new HashMap<String, Object>();
variables.put("employeeId", "Kermit"); //请假人
String processId = runtimeService.startProcessInstanceByKey("leave", variables).getId();
System.out.println("***************启动一个请假流程完成***************" + processId);
} /**
* 提交请假申请
*/
@Test
public void apply(){
System.out.println("***************提交请假申请开始***************");
List<Task> tasks = taskService.createTaskQuery().taskAssignee("Kermit").list();
System.out.println(tasks.size());
for (Task task : tasks) {
System.out.println("Kermit的任务taskname:" + task.getName() + ",id:" + task.getId());
taskService.setVariable(task.getId(), "day", 4);//设置请假天数
taskService.complete(task.getId());//完成任务
System.out.println("请假4 天");
}
System.out.println("***************提交请假申请完成***************");
} @Test
public void step2manager() {
System.out.println("***************经理组审批流程开始***************");
List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("manager").list();// 经理组的任务
System.out.println("经理组的任务：" + tasks.size());
for (Task task : tasks) {
System.out.println("经理组的任务taskname:" + task.getName() + ",id:" + task.getId());
taskService.claim(task.getId(), "李四");//申领任务
taskService.setVariable(task.getId(), "flag", false);//true批准，false不批准
Object applyUser = taskService.getVariable(task.getId(), "employeeId");
Object day = taskService.getVariable(task.getId(), "day");
System.out.println(String.format("%s请假%s天", applyUser, day));
taskService.complete(task.getId());//完成任务
}
System.out.println("***************经理组审批流程结束***************");
} @Test
public void step2Boss() {
System.out.println("***************总经理组审批流程开始***************");
List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("boss").list();// 总经理组的任务
System.out.println("总经理组的任务：" + tasks.size());
for (Task task : tasks) {
System.out.println("manager的任务taskname:" + task.getName() + ",id:" + task.getId());
taskService.claim(task.getId(), "王五");//申领任务
taskService.setVariable(task.getId(), "flag", true);//true批准,false不批准
Object applyUser = taskService.getVariable(task.getId(), "employeeId");
Object day = taskService.getVariable(task.getId(), "day");
System.out.println(String.format("%s请假%s天", applyUser, day));
taskService.complete(task.getId());//完成任务
}
System.out.println("***************总经理组审批流程结束***************");
}
}
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);