【弄nèng - Activiti6】Activiti6入门篇（七）—— 多实例任务

Activiti中提供了多实例任务，多实例实在任务节点上添加额外的属性，使任务可以变成多实例，以下节点都可以添加：

• User Task
• Script Task
• Java Service Task
• Web Service Task
• Business Rule Task
• Email Task
• Manual Task
• Receive Task
• (Embedded) Sub-Process
• Call Activity

多实例内置变量

• nrOfInstances：实例总数
• nrOfActiveInstances：当前活动的实例数，对于顺序执行的多实例，值一直为1。
• nrOfCompletedInstances：已经完成实例的数目。

*后台服务基于Springboot2 + Activiti6，整合文章请参考：https://blog.csdn.net/yy756127197/article/details/101211510 不需要流程设计器就排除3,4步骤 *

1. 多实例

1.1 流程设计

节点设置

说明：

• Multi-instance type : 有两种类型，并行和串行
• Collection(Multi-instance): 动态集合，根据变量传入
• Completion condition(Multi-instance): 任务结束条件，默认全部完成
• Element variable(Multi-instance): 遍历后每一项的别名
• Cardinality(multi-instance) : 手动指定多实例循环几次

流程图

流程文件bpmn

<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="multiInstance" name="多实例测试" isExecutable="true">
    <startEvent id="startEvent1">startEvent>
    <userTask id="task1" name="发起会议" activiti:assignee="admin">
      <extensionElements>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
      extensionElements>
    userTask>
    <sequenceFlow id="sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1" sourceRef="startEvent1" targetRef="task1">sequenceFlow>
    <userTask id="task2" name="会议签到" activiti:assignee="${user}">
      <extensionElements>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
      extensionElements>
      <multiInstanceLoopCharacteristics isSequential="false" activiti:collection="users" activiti:elementVariable="user">
        <completionCondition>${nrOfCompletedInstances/nrOfInstances >= 0.5}completionCondition>
      multiInstanceLoopCharacteristics>
    userTask>
    <sequenceFlow id="sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC" sourceRef="task1" targetRef="task2">sequenceFlow>
    <endEvent id="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">endEvent>
    <sequenceFlow id="sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2" sourceRef="task2" targetRef="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">sequenceFlow>
  process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_multiInstance">
    <bpmndi:BPMNPlane bpmnElement="multiInstance" id="BPMNPlane_multiInstance">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
        <omgdc:Bounds height="30.0" width="30.0" x="210.0" y="195.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task1" id="BPMNShape_task1">
        <omgdc:Bounds height="80.0" width="100.0" x="375.0" y="170.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task2" id="BPMNShape_task2">
        <omgdc:Bounds height="80.0" width="100.0" x="600.0" y="170.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529" id="BPMNShape_sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">
        <omgdc:Bounds height="28.0" width="28.0" x="795.0" y="196.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1" id="BPMNEdge_sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1">
        <omgdi:waypoint x="240.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="375.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC" id="BPMNEdge_sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC">
        <omgdi:waypoint x="475.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="600.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2" id="BPMNEdge_sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2">
        <omgdi:waypoint x="700.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="795.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
    bpmndi:BPMNPlane>
  bpmndi:BPMNDiagram>
definitions>

1.2 测试类

MultiInstanceTaskTest.java

import com.it.cloud.modules.activiti.service.IActReModelService;
import org.activiti.engine.HistoryService;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 多实例测试
 */
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class MultiInstanceTaskTest {

    @Autowired
    private IActReModelService actReModelService;

    @Autowired
    private RuntimeService runtimeService;

    @Autowired
    private RepositoryService repositoryService;

    @Autowired
    private TaskService taskService;

    @Autowired
    private HistoryService historyService;

    /**
     * 部署流程定义
     */
    @Test
    public void deploy() {
        Deployment deployment = repositoryService.createDeployment() // 创建部署
                .addClasspathResource("diagrams/multiInstance.bpmn20.xml") // 加载流程资源文件
                .name("multiInstance流程") // 流程名称
                .deploy(); // 部署
        System.out.println("流程部署ID:" + deployment.getId());
        System.out.println("流程部署Name:" + deployment.getName());
    }

    /**
     * 启动流程实例
     */
    @Test
    public void start() {
        ProcessInstance pi = runtimeService.startProcessInstanceByKey("multiInstance"); // 流程定义表的KEY字段值
        System.out.println("流程实例ID:" + pi.getId());
        System.out.println("流程定义ID:" + pi.getProcessDefinitionId());
    }

    /**
     * 查看任务
     */
    @Test
    public void queryTask() {
        List<Task> taskList = taskService.createTaskQuery() // 创建任务查询
                .taskAssignee("admin") // 指定某个人
                .list();
        for (Task task : taskList) {
            System.out.println("任务ID:" + task.getId());
            System.out.println("任务名称:" + task.getName());
            System.out.println("任务创建时间:" + task.getCreateTime());
            System.out.println("任务委派人:" + task.getAssignee());
            System.out.println("流程实例ID:" + task.getProcessInstanceId());
        }
    }

    /**
     * 完成任务
     */
    @Test
    public void completeTask() {
        taskService.complete("42536");
    }

    /**
     * 完成任务2
     */
    @Test
    public void completeTask2() {
        Map<String, Object> variables = new HashMap<String, Object>();
        variables.put("users", Arrays.asList("test1,test2,test3,test4".split(",")));
        taskService.complete("40005", variables);
    }
}

1.3 运行

运行deploy()，start()

1.3.1 查询任务

运行queryTask()，流程运行完服务任务，直接结束

效果：

1.3.2 完成发起会议任务

运行completeTask2()，设置变量users

效果：
数据表 ACT_RU_TASK

1.3.3 完成一个签到任务

运行completeTask()

效果：
数据表 ACT_RU_TASK

1.3.4 完成第二个签到任务

运行completeTask()，到达完成条件，流程结束

效果：
数据表 ACT_RU_TASK

2. 多实例-- 一票否决

2.1 流程设计

节点设置

说明：
跟前一个不同的地方在于完成条件，${nrOfCompletedInstances/nrOfInstances >= 0.5 || flag==false}
如果flag变量为false 就直接结束当前节点

流程图

流程文件bpmn

<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="multiInstance-reject" name="多实例一票否决测试" isExecutable="true">
    <startEvent id="startEvent1">startEvent>
    <userTask id="task1" name="发起会议" activiti:assignee="admin">
      <extensionElements>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
      extensionElements>
    userTask>
    <sequenceFlow id="sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1" sourceRef="startEvent1" targetRef="task1">sequenceFlow>
    <userTask id="task2" name="会议签到" activiti:assignee="${user}">
      <extensionElements>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
      extensionElements>
      <multiInstanceLoopCharacteristics isSequential="false" activiti:collection="users" activiti:elementVariable="user">
        <completionCondition>${nrOfCompletedInstances/nrOfInstances >= 0.5 || flag==false}completionCondition>
      multiInstanceLoopCharacteristics>
    userTask>
    <sequenceFlow id="sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC" sourceRef="task1" targetRef="task2">sequenceFlow>
    <endEvent id="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">endEvent>
    <sequenceFlow id="sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2" sourceRef="task2" targetRef="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">sequenceFlow>
  process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_multiInstance-reject">
    <bpmndi:BPMNPlane bpmnElement="multiInstance-reject" id="BPMNPlane_multiInstance-reject">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
        <omgdc:Bounds height="30.0" width="30.0" x="210.0" y="195.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task1" id="BPMNShape_task1">
        <omgdc:Bounds height="80.0" width="100.0" x="375.0" y="170.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="task2" id="BPMNShape_task2">
        <omgdc:Bounds height="80.0" width="100.0" x="600.0" y="170.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-EA4EA283-C5CF-43C5-8401-E0BF40132529" id="BPMNShape_sid-EA4EA283-C5CF-43C5-8401-E0BF40132529">
        <omgdc:Bounds height="28.0" width="28.0" x="795.0" y="196.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1" id="BPMNEdge_sid-AB72BCEE-4568-4240-A4A8-23A79506CAC1">
        <omgdi:waypoint x="240.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="375.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC" id="BPMNEdge_sid-98BE643F-B247-46B2-94BA-EA9E06EBD9AC">
        <omgdi:waypoint x="475.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="600.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2" id="BPMNEdge_sid-BFD094C8-66EC-4ED2-8A35-0100E0B4E8B2">
        <omgdi:waypoint x="700.0" y="210.0">omgdi:waypoint>
        <omgdi:waypoint x="795.0" y="210.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
    bpmndi:BPMNPlane>
  bpmndi:BPMNDiagram>
definitions>

2.2 测试类

MultiInstanceRejectTaskTest.java

import com.it.cloud.modules.activiti.service.IActReModelService;
import org.activiti.engine.HistoryService;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 多实例测试
 */
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class MultiInstanceTaskTest {

    @Autowired
    private IActReModelService actReModelService;

    @Autowired
    private RuntimeService runtimeService;

    @Autowired
    private RepositoryService repositoryService;

    @Autowired
    private TaskService taskService;

    @Autowired
    private HistoryService historyService;

    /**
     * 部署流程定义
     */
    @Test
    public void deploy() {
        Deployment deployment = repositoryService.createDeployment() // 创建部署
                .addClasspathResource("diagrams/multiInstance.bpmn20.xml") // 加载流程资源文件
                .name("multiInstance流程") // 流程名称
                .deploy(); // 部署
        System.out.println("流程部署ID:" + deployment.getId());
        System.out.println("流程部署Name:" + deployment.getName());
    }

    /**
     * 启动流程实例
     */
    @Test
    public void start() {
        ProcessInstance pi = runtimeService.startProcessInstanceByKey("multiInstance"); // 流程定义表的KEY字段值
        System.out.println("流程实例ID:" + pi.getId());
        System.out.println("流程定义ID:" + pi.getProcessDefinitionId());
    }

    /**
     * 查看任务
     */
    @Test
    public void queryTask() {
        List<Task> taskList = taskService.createTaskQuery() // 创建任务查询
                .taskAssignee("admin") // 指定某个人
                .list();
        for (Task task : taskList) {
            System.out.println("任务ID:" + task.getId());
            System.out.println("任务名称:" + task.getName());
            System.out.println("任务创建时间:" + task.getCreateTime());
            System.out.println("任务委派人:" + task.getAssignee());
            System.out.println("流程实例ID:" + task.getProcessInstanceId());
        }
    }

    /**
     * 完成任务
     */
    @Test
    public void completeTask() {
        taskService.complete("42536");
    }

    /**
     * 完成任务2
     */
    @Test
    public void completeTask2() {
        Map<String, Object> variables = new HashMap<String, Object>();
        variables.put("users", Arrays.asList("test1,test2,test3,test4".split(",")));
        taskService.complete("40005", variables);
    }
}

2.3 运行

运行deploy()，start()

2.3.1 查询任务

运行queryTask()，流程运行完服务任务，直接结束

效果：

2.3.2 完成发起会议任务

运行completeTask2()，设置变量users

效果：
数据表 ACT_RU_TASK

2.3.3 完成一个签到任务

运行completeTask3(), 设置flag=dalse, 到达完成条件，流程结束

效果：
数据表 ACT_RU_TASK

这就实现了一票否决的效果，更多效果，可以设置完成条件来实现

---

源码地址

IT-CLOUD-ACTIVITI6
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