Activiti无指定开始事件实例

来源：http://www.bug315.com/article/164.htm

Activiti无指定开始事件指不为开始事件指定任何的触发条件的事件。下面将通过一个实例来学习什么是无指定开始事件。

startEvent（无指定开始事件图标）

流程图：

startEvent

流程启动后进入“任务01”（调用complete方法来完成该任务），然后结束流程。

流程定义XML：

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<?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: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="startEventTest01" name="开始事件测试01" isExecutable="true">

    <startEvent id="start"></startEvent>

    <userTask id="task01" name="任务01"></userTask>

    <endEvent id="end"></endEvent>

    <sequenceFlow id="sid-B96A1813-6837-4845-8167-3ACA1A3B3D20" sourceRef="start" targetRef="task01"></sequenceFlow>

    <sequenceFlow id="sid-35F14E43-5255-4FCC-8962-209578CDE088" sourceRef="task01" targetRef="end"></sequenceFlow>

  </process>

   

  <bpmndi:BPMNDiagram id="BPMNDiagram_startEventTest01">

    <bpmndi:BPMNPlane bpmnElement="startEventTest01" id="BPMNPlane_startEventTest01">

      <bpmndi:BPMNShape bpmnElement="start" id="BPMNShape_start">

        <omgdc:Bounds height="30.0" width="30.0" x="116.0" y="150.0"></omgdc:Bounds>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape bpmnElement="task01" id="BPMNShape_task01">

        <omgdc:Bounds height="80.0" width="100.0" x="191.0" y="125.0"></omgdc:Bounds>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape bpmnElement="end" id="BPMNShape_end">

        <omgdc:Bounds height="28.0" width="28.0" x="336.0" y="151.0"></omgdc:Bounds>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNEdge bpmnElement="sid-35F14E43-5255-4FCC-8962-209578CDE088" id="BPMNEdge_sid-35F14E43-5255-4FCC-8962-209578CDE088">

        <omgdi:waypoint x="291.0" y="165.0"></omgdi:waypoint>

        <omgdi:waypoint x="336.0" y="165.0"></omgdi:waypoint>

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge bpmnElement="sid-B96A1813-6837-4845-8167-3ACA1A3B3D20" id="BPMNEdge_sid-B96A1813-6837-4845-8167-3ACA1A3B3D20">

        <omgdi:waypoint x="146.0" y="165.0"></omgdi:waypoint>

        <omgdi:waypoint x="191.0" y="165.0"></omgdi:waypoint>

      </bpmndi:BPMNEdge>

    </bpmndi:BPMNPlane>

  </bpmndi:BPMNDiagram>

</definitions>

客户端测试代码：

package com.bug315.event;

import org.activiti.engine.ProcessEngine;

import org.activiti.engine.ProcessEngines;

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;

/**

 * 开始事件测试

 * @author Administrator

 *

 */

public class StartEventTest01 {

    public static void main(String[] args) {

        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();

        RepositoryService repositoryService = processEngine.getRepositoryService();

        Deployment deployment = repositoryService.createDeployment().addClasspathResource("bpmn/startEventTest01.bpmn20.xml").deploy();

        System.out.println("deployment Id = " + deployment.getId());

        System.out.println("deployment Name = " + deployment.getName());

         

        RuntimeService runtimeService = processEngine.getRuntimeService();

        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("startEventTest01");

        System.out.println("processInstance Id = " + processInstance.getId());

        System.out.println("processInstance BusinessKey = " + processInstance.getBusinessKey());

         

        TaskService taskService = processEngine.getTaskService();

        Task task = taskService.createTaskQuery().singleResult();

        System.out.println("task Id = " + task.getId());

        System.out.println("task Name = " + task.getName());

        taskService.complete(task.getId());

        System.out.println("task完成");

         

        task = taskService.createTaskQuery().singleResult();

        System.out.println("task = " + task);

    }

     

}

Activiti配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

    <bean id="processEngineConfiguration"  

        class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/activiti" />

        <property name="jdbcDriver" value="com.mysql.jdbc.Driver" />

        <property name="jdbcUsername" value="root" />

        <property name="jdbcPassword" value="aaaaaa" />

        <property name="jobExecutorActivate" value="true" />

        <property name="databaseType" value="mysql"/>

        <property name="databaseSchemaUpdate" value="true" />

        <property name="history" value="full"/>

    </bean>

</beans>

注意事项：

1、流程引擎并不知道流程将在什么时候开始，如果要启动流程，必须使用startProcessBy***方法。

2、子流程中总会有一个无指定开始事件，即使将开始事件强制定义为其他开始事件，其也会被当作无指定开始事件。因为流程到达子流程时，就意味着子流程需要启动，而且并不需要其他启动条件。