Activiti工作流Day07-BPMN 2.0流程使用示例

2021-04-14  本文已影响0人  攻城狮Chova

BPMN 2.0介绍

定义一个流程

<definitions
  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
  xmlns:activiti="http://activiti.org/bpmn"
  targetNamespace="Examples">

  <process id="myProcess" name="My First Process">
    ..
  </process>

</definitions>

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL
                    http://www.omg.org/spec/BPMN/2.0/20100501/BPMN20.xsd

ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("myProcess");

==注意:== 它和startProcessInstanceById方法不同:这个方法期望使用Activiti引擎在发布时自动生成的id.可以通过调用processDefinition.getId() 方法获得这个值,生成的id的格式为 key:version, 最大长度限制为64个字符, 如果在启动时抛出了一个ActivitiException: 说明生成的id太长了,需要限制流程的key的长度

BPMN流程示例前提

目标

用例

流程图

XML内容

<definitions id="definitions"
  targetNamespace="http://activiti.org/bpmn20"
  xmlns:activiti="http://activiti.org/bpmn"
  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL">

        <process id="financialReport" name="Monthly financial report reminder process">

          <startEvent id="theStart" />

          <sequenceFlow id='flow1' sourceRef='theStart' targetRef='writeReportTask' />

          <userTask id="writeReportTask" name="Write monthly financial report" >
            <documentation>
              Write monthly financial report for publication to shareholders.
            </documentation>
            <potentialOwner>
              <resourceAssignmentExpression>
                <formalExpression>accountancy</formalExpression>
              </resourceAssignmentExpression>
            </potentialOwner>
          </userTask>

          <sequenceFlow id='flow2' sourceRef='writeReportTask' targetRef='verifyReportTask' />

          <userTask id="verifyReportTask" name="Verify monthly financial report" >
            <documentation>
              Verify monthly financial report composed by the accountancy department.
              This financial report is going to be sent to all the company shareholders.
            </documentation>
            <potentialOwner>
              <resourceAssignmentExpression>
                <formalExpression>management</formalExpression>
              </resourceAssignmentExpression>
            </potentialOwner>
          </userTask>

          <sequenceFlow id='flow3' sourceRef='verifyReportTask' targetRef='theEnd' />

          <endEvent id="theEnd" />

        </process>

</definitions>

启动一个流程实例

Deployment deployment = repositoryService.createDeployment()
  .addClasspathResource("FinancialReportProcess.bpmn20.xml")
  .deploy();

ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("financialReport");

public static void main(String[] args) {

  // Create Activiti process engine
  ProcessEngine processEngine = ProcessEngineConfiguration
    .createStandaloneProcessEngineConfiguration()
    .buildProcessEngine();

  // Get Activiti services
  RepositoryService repositoryService = processEngine.getRepositoryService();
  RuntimeService runtimeService = processEngine.getRuntimeService();

  // Deploy the process definition
  repositoryService.createDeployment()
    .addClasspathResource("FinancialReportProcess.bpmn20.xml")
    .deploy();

  // Start a process instance
  runtimeService.startProcessInstanceByKey("financialReport");
}

任务列表

List<Task> tasks = taskService.createTaskQuery().taskCandidateUser("kermit").list();

<potentialOwner>
  <resourceAssignmentExpression>
    <formalExpression>accountancy</formalExpression>
  </resourceAssignmentExpression>
</potentialOwner>

TaskService taskService = processEngine.getTaskService();
List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("accountancy").list();

领取任务

taskService.claim(task.getId(), "fozzie");

List<Task> tasks = taskService.createTaskQuery().taskAssignee("fozzie").list();

完成任务

taskService.complete(task.getId());

结束流程

HistoryService historyService = processEngine.getHistoryService();
HistoricProcessInstance historicProcessInstance =
historyService.createHistoricProcessInstanceQuery().processInstanceId(procId).singleResult();
System.out.println("Process instance end time: " + historicProcessInstance.getEndTime());

源码

public class TenMinuteTutorial {

  public static void main(String[] args) {

    // Create Activiti process engine
    ProcessEngine processEngine = ProcessEngineConfiguration
      .createStandaloneProcessEngineConfiguration()
      .buildProcessEngine();

    // Get Activiti services
    RepositoryService repositoryService = processEngine.getRepositoryService();
    RuntimeService runtimeService = processEngine.getRuntimeService();

    // Deploy the process definition
    repositoryService.createDeployment()
      .addClasspathResource("FinancialReportProcess.bpmn20.xml")
      .deploy();

    // Start a process instance
    String procId = runtimeService.startProcessInstanceByKey("financialReport").getId();

    // Get the first task
    TaskService taskService = processEngine.getTaskService();
    List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("accountancy").list();
    for (Task task : tasks) {
      System.out.println("Following task is available for accountancy group: " + task.getName());

      // claim it
      taskService.claim(task.getId(), "fozzie");
    }

    // Verify Fozzie can now retrieve the task
    tasks = taskService.createTaskQuery().taskAssignee("fozzie").list();
    for (Task task : tasks) {
      System.out.println("Task for fozzie: " + task.getName());

      // Complete the task
      taskService.complete(task.getId());
    }

    System.out.println("Number of tasks for fozzie: "
            + taskService.createTaskQuery().taskAssignee("fozzie").count());

    // Retrieve and claim the second task
    tasks = taskService.createTaskQuery().taskCandidateGroup("management").list();
    for (Task task : tasks) {
      System.out.println("Following task is available for accountancy group: " + task.getName());
      taskService.claim(task.getId(), "kermit");
    }

    // Completing the second task ends the process
    for (Task task : tasks) {
      taskService.complete(task.getId());
    }

    // verify that the process is actually finished
    HistoryService historyService = processEngine.getHistoryService();
    HistoricProcessInstance historicProcessInstance =
      historyService.createHistoricProcessInstanceQuery().processInstanceId(procId).singleResult();
    System.out.println("Process instance end time: " + historicProcessInstance.getEndTime());
  }

}

总结

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