【弄nèng - Activiti6】入门篇（十七）—— 消息中间事件

司马缸砸缸了
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部分简介摘抄自官方文档
参考杨大仙的程序空间https://my.oschina.net/JavaLaw

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

1. 消息事件定义

1.1 简介

消息事件是一种引用了消息定义的事件，与信号时间不同的是，消息只能只想一个接收人，不能像信号事件一样广播。
分为消息开始事件和中间消息事件。

1.2 触发消息事件

消息开始事件

ProcessInstance startProcessInstanceByMessage(String messageName);
ProcessInstance startProcessInstanceByMessage(String messageName, Map<String, Object> processVariables);
ProcessInstance startProcessInstanceByMessage(String messageName, String businessKey, Map<String, Object> processVariables);

消息中间事件

void messageEventReceived(String messageName, String executionId);
void messageEventReceived(String messageName, String executionId, HashMap<String, Object> processVariables);

1.3 查询消息事件的订阅

消息开始事件

ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
      .messageEventSubscription("msgStart")
      .singleResult();

因为同时只能有一个流程定义关联到消息的订阅点，查询总是返回0或一个结果。 如果流程定义更新了， 那么只有最新版本的流程定义会订阅到消息事件上。

消息中间事件

Execution execution = runtimeService.createExecutionQuery()
      .messageEventSubscriptionName("msg")
      .processInstanceId(pi.getId())
      .singleResult();

2. 消息中间事件

2.1 简介

消息中间事件作为流程一个节点使用

2.2 流程设计

场景：用户支付成功后等待一分钟，商家发货

设置消息定义
在这里插入图片描述
在这里插入图片描述

流程图
在这里插入图片描述

流程文件bpmn

<?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/processdef">
  <signal id="pay" name="pay" activiti:scope="global"></signal>
  <message id="msg" name="msg"></message>
  <process id="messageEvent" name="messageEvent" isExecutable="true">
    <documentation>messageEvent</documentation>
    <startEvent id="startEvent1"></startEvent>
    <sequenceFlow id="sid-D5F258A9-0F46-4962-AD44-589CC798FDBB" sourceRef="startEvent1" targetRef="sid-73B507A7-8A99-462D-B354-A0C61337E657"></sequenceFlow>
    <intermediateCatchEvent id="sid-73B507A7-8A99-462D-B354-A0C61337E657">
      <messageEventDefinition messageRef="msg"></messageEventDefinition>
    </intermediateCatchEvent>
    <userTask id="sid-147E3B0E-76DC-4D58-8D5A-ECD25280AA8A" name="用户任务" activiti:assignee="msgUser">
      <extensionElements>
        <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
      </extensionElements>
    </userTask>
    <sequenceFlow id="sid-1F79F1F5-BB81-4100-8EC5-4B0C5B818B25" sourceRef="sid-73B507A7-8A99-462D-B354-A0C61337E657" targetRef="sid-147E3B0E-76DC-4D58-8D5A-ECD25280AA8A"></sequenceFlow>
    <endEvent id="sid-AA796559-C664-475B-A525-516489EE26C0"></endEvent>
    <sequenceFlow id="sid-2B7DA672-5026-4545-8110-A105ACD31665" sourceRef="sid-147E3B0E-76DC-4D58-8D5A-ECD25280AA8A" targetRef="sid-AA796559-C664-475B-A525-516489EE26C0"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_messageEvent">
    <bpmndi:BPMNPlane bpmnElement="messageEvent" id="BPMNPlane_messageEvent">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
        <omgdc:Bounds height="30.0" width="30.0" x="165.0" y="150.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-73B507A7-8A99-462D-B354-A0C61337E657" id="BPMNShape_sid-73B507A7-8A99-462D-B354-A0C61337E657">
        <omgdc:Bounds height="30.0" width="30.0" x="300.0" y="150.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-147E3B0E-76DC-4D58-8D5A-ECD25280AA8A" id="BPMNShape_sid-147E3B0E-76DC-4D58-8D5A-ECD25280AA8A">
        <omgdc:Bounds height="80.0" width="100.0" x="435.0" y="125.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-AA796559-C664-475B-A525-516489EE26C0" id="BPMNShape_sid-AA796559-C664-475B-A525-516489EE26C0">
        <omgdc:Bounds height="28.0" width="28.0" x="630.0" y="151.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="sid-D5F258A9-0F46-4962-AD44-589CC798FDBB" id="BPMNEdge_sid-D5F258A9-0F46-4962-AD44-589CC798FDBB">
        <omgdi:waypoint x="195.0" y="165.0"></omgdi:waypoint>
        <omgdi:waypoint x="300.0" y="165.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-2B7DA672-5026-4545-8110-A105ACD31665" id="BPMNEdge_sid-2B7DA672-5026-4545-8110-A105ACD31665">
        <omgdi:waypoint x="535.0" y="165.0"></omgdi:waypoint>
        <omgdi:waypoint x="630.0" y="165.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-1F79F1F5-BB81-4100-8EC5-4B0C5B818B25" id="BPMNEdge_sid-1F79F1F5-BB81-4100-8EC5-4B0C5B818B25">
        <omgdi:waypoint x="330.0" y="165.0"></omgdi:waypoint>
        <omgdi:waypoint x="435.0" y="165.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

2.3 测试类

MessageEventTest.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.Execution;
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;

/**
 * 消息中间事件
 */
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class MessageEventTest {

    @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/messageEvent.bpmn20.xml") // 加载流程资源文件
                .name("messageEvent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() throws InterruptedException {
        ProcessInstance pi = runtimeService.startProcessInstanceByKey("messageEvent"); // 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());
        System.out.println("-------------------完美的分割线-------------------");

        // 查询任务
        Execution execution = runtimeService.createExecutionQuery()
                .messageEventSubscriptionName("msg")
                .processInstanceId(pi.getId())
                .singleResult();
        System.out.println("Execution: " + execution);
        runtimeService.messageEventReceived("msg", execution.getId());

        // 睡一会
        Thread.sleep(1000 * 3);

        // 查询任务
        Task task = taskService.createTaskQuery()
                .taskAssignee("msgUser") // 指定某个人
                .singleResult();
        System.out.println("任务名称: " + task.getName());
        taskService.complete(task.getId());
    }
}

2.4 运行

运行deploy()

2.4.1 启动任务

运行start()

效果：
在这里插入图片描述

源码地址

IT-CLOUD-ACTIVITI6\

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