Activiti学习笔记10 — 动态任务分配

动态任务分配使用的两种方式

一、通过特殊表达式，来获取任务信息 ，在流程 UserTask节点上设置 ${流程变量的Key}

1、流程定义

<?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="userDynamicTask1" name="动态任务处理1" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="休假" name="休假" activiti:assignee="${user}"></userTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="休假"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow2" sourceRef="休假" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_userDynamicTask1">
    <bpmndi:BPMNPlane bpmnElement="userDynamicTask1" id="BPMNPlane_userDynamicTask1">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="340.0" y="110.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="休假" id="BPMNShape_休假">
        <omgdc:Bounds height="55.0" width="105.0" x="305.0" y="180.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="340.0" y="270.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="357.0" y="145.0"></omgdi:waypoint>
        <omgdi:waypoint x="357.0" y="180.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="357.0" y="235.0"></omgdi:waypoint>
        <omgdi:waypoint x="357.0" y="270.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

2、发布流程

/**
     * 2、发布一个流程：发布通过特殊表达式，来获取任务信息  ${流程变量的Key}的流程
     */
    @Test
    public void  testDeployProcess() {
        RepositoryService repositoryService = processEngine.getRepositoryService();
        DeploymentBuilder builder = repositoryService.createDeployment();
        // 加载发布资源
        builder.name("动态任务处理流程1-测试") // 设置流程显示别名
                .addClasspathResource("leave3.bpmn") // 设置流程规则文件
                .addClasspathResource("leave3.png"); // 设置流程规则的图片
        // 发布流程
        builder.deploy();
    }

3、启动与测试流程

    
    /**
     * 3、启动流程、执行任务，并查看状态
     */
    @Test
    public void testUserTask() {        
        // 获取RuntimeService服务对象的实例
        RuntimeService runtimeService = processEngine.getRuntimeService();
        String processDefinitionKey = "userDynamicTask1";
        // 自动执行与Key相对应的流程的最高版本
        Map<String, Object> variables = new HashMap<String, Object>();
        //variables.put("user", "张三");
        variables.put("user", "李四");
        
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey(processDefinitionKey,variables);        
        String processInstanceId = processInstance.getId();        
        logger.info("processInstanceId:" + processInstance.getId());
        
        // 获取TaskService服务对象的实例
        TaskService taskService = processEngine.getTaskService();
        //String assignee = "张三";
        String assignee = "李四";
        List<Task> tasks = taskService.createTaskQuery().taskAssignee(assignee).list();
        Assert.assertEquals(1, tasks.size());
        Task task = tasks.get(0);        
        logger.info("taskName:" + task.getName());
        logger.info("taskAssignee:" + task.getAssignee());
        Assert.assertEquals("休假",task.getName());
        
        //完成任务
        taskService.complete(task.getId());        
        
        //检查结束状态
        ProcessInstance pInstance = runtimeService
                                                        .createProcessInstanceQuery()
                                                        .processInstanceId(processInstanceId)
                                                        .singleResult();
        Assert.assertNull(pInstance);
        logger.info("动态任务处理流程1,使用${流程变量的Key}方式成功执行！");        
        
    }

4、运行结果

[INFO][2015-12-02 11:44:05,129][com.mcs.activiti.test.TestUserTaskDynamic]processInstanceId:130001
[INFO][2015-12-02 11:44:05,159][com.mcs.activiti.test.TestUserTaskDynamic]taskName:休假
[INFO][2015-12-02 11:44:05,159][com.mcs.activiti.test.TestUserTaskDynamic]taskAssignee:李四
[INFO][2015-12-02 11:44:05,456][com.mcs.activiti.test.TestUserTaskDynamic]动态任务处理流程1,使用${流程变量的Key}方式成功执行！

二、使用任务分配处理器

1、自定义任务分配处理器步骤

　　1.1、  创建一个类来充分“任务分配处理器”，需要实现TaskListener

　　1.2、  在实现方式中添加响应的处理逻辑；

　　1.3、  在流程中，配置/使用任务处理器。

2、创建自定义任务分配处理器，实现TaskListener

package mcs.listener;

import org.activiti.engine.delegate.DelegateTask;
import org.activiti.engine.delegate.TaskListener;

public class ManagerTaskListenerHandler implements TaskListener {

    private static final long serialVersionUID = 1L;

    @Override
    public void notify(DelegateTask delegateTask) {
        String assignee = "王五";
        delegateTask.setAssignee(assignee);
        
        //delegateTask.addCandidateUser("王小二");
    }

}

3、流程定义

<?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="userDynamicTask2" name="动态任务处理2" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <endEvent id="endevent1" name="End"></endEvent>
    <userTask id="休假" name="休假">
      <extensionElements>
        <activiti:taskListener event="create" class="mcs.listener.ManagerTaskListenerHandler"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="休假"></sequenceFlow>
    <sequenceFlow id="flow2" sourceRef="休假" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_userDynamicTask2">
    <bpmndi:BPMNPlane bpmnElement="userDynamicTask2" id="BPMNPlane_userDynamicTask2">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="340.0" y="110.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="340.0" y="270.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="休假" id="BPMNShape_休假">
        <omgdc:Bounds height="55.0" width="105.0" x="305.0" y="180.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="357.0" y="145.0"></omgdi:waypoint>
        <omgdi:waypoint x="357.0" y="180.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="357.0" y="235.0"></omgdi:waypoint>
        <omgdi:waypoint x="357.0" y="270.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

4、发布流程

/**
     * 4、发布一个流程：发布通过自定义任务分配处理器的流程
     *         自定义任务分配处理器步骤:
     *         1、创建一个类来充分“任务分配处理器”，需要实现TaskListener
    *        2、在实现方式中添加响应的处理逻辑；
    *        3、在流程中，配置/使用任务处理器。
     */
    @Test
    public void  testDeployProcess2() {
        RepositoryService repositoryService = processEngine.getRepositoryService();
        DeploymentBuilder builder = repositoryService.createDeployment();
        // 加载发布资源
        builder.name("动态任务处理流程2-测试") // 设置流程显示别名
                .addClasspathResource("leave4.bpmn") // 设置流程规则文件
                .addClasspathResource("leave4.png"); // 设置流程规则的图片
        // 发布流程
        builder.deploy();
    }
    

5、启动与测试流程

    /**
     * 5、启动流程、执行任务，并查看状态
     */
    @Test
    public void testUserTask2() {        
        // 获取RuntimeService服务对象的实例
        RuntimeService runtimeService = processEngine.getRuntimeService();
        String processDefinitionKey = "userDynamicTask2";
        // 自动执行与Key相对应的流程的最高版本    
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey(processDefinitionKey);        
        String processInstanceId = processInstance.getId();        
        logger.info("processInstanceId:" + processInstance.getId());
        
        // 获取TaskService服务对象的实例
        TaskService taskService = processEngine.getTaskService();
        String assignee = "王五";
        List<Task> tasks = taskService.createTaskQuery().taskAssignee(assignee).list();
        Assert.assertEquals(1, tasks.size());
        Task task = tasks.get(0);        
        logger.info("taskName:" + task.getName());
        logger.info("taskAssignee:" + task.getAssignee());
        Assert.assertEquals("休假",task.getName());
        
        //完成任务
        taskService.complete(task.getId());        
        
        //检查结束状态
        ProcessInstance pInstance = runtimeService
                                                        .createProcessInstanceQuery()
                                                        .processInstanceId(processInstanceId)
                                                        .singleResult();
        Assert.assertNull(pInstance);
        logger.info("动态任务处理流程2,使用自定义任务分配处理器方式成功执行！");        
        
    }

6、运行结果

[INFO][2015-12-02 11:46:51,818][com.mcs.activiti.test.TestUserTaskDynamic]processInstanceId:132501
[INFO][2015-12-02 11:46:51,879][com.mcs.activiti.test.TestUserTaskDynamic]taskName:休假
[INFO][2015-12-02 11:46:51,879][com.mcs.activiti.test.TestUserTaskDynamic]taskAssignee:王五
[INFO][2015-12-02 11:46:52,192][com.mcs.activiti.test.TestUserTaskDynamic]动态任务处理流程2,使用自定义任务分配处理器方式成功执行！