Flowable深入浅出-15 Flowable-BPMN操作流程之排他网关

背景

流程在审批的过程中需要进行一些判断然后再看下一步怎么走，完成判断逻辑的是网关，排他网关就是其中的一种。

定义

排他网关（也叫异或（XOR）网关，或更技术性的叫法 基于数据的排他网关）， 用来在流程中实现决策。 当流程执行到这个网关，所有外出顺序流都会被处理一遍。 其中条件解析为true的顺序流（或者没有设置条件，概念上在顺序流上定义了一个’true’） 会被选中，让流程继续运行。简单理解条件为True继续执行，False将不执行。

流程准备

我们在Modeler中给我们的流程配置一个排他网关，添加后流程如下：

在排他网关的到结束的连接线上配置好网关是否通过的条件，比如审核通过我们设置为${outcome==‘通过’},当走到这里流程变量outcome为通过的时候将会走审核通过这个流程，等于拒绝的时候走下面的流程，参数配置如下图所示:

流程文件

流程文件内容如下：

<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:flowable="http://flowable.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.flowable.org/processdef">
  <process id="test_bpmn" name="测试BPMN模型" isExecutable="true">
    <documentation>测试BPMN模型documentation>
    <startEvent id="start" name="开始">startEvent>
    <endEvent id="end" name="通过结束">endEvent>
    <userTask id="testUser" name="用户任务测试" flowable:assignee="admin">
      <extensionElements>
        <flowable:taskListener event="create" class="com.hyj.flowlistener.CommonUserStartListener">flowable:taskListener>
        <modeler:initiator-can-complete xmlns:modeler="http://flowable.org/modeler">modeler:initiator-can-complete>
      extensionElements>
    userTask>
    <sequenceFlow id="sid-8D834F3C-45A8-4C88-9AD1-1AC426CC9002" sourceRef="start" targetRef="testUser">sequenceFlow>
    <exclusiveGateway id="ex_gateway_check" name="审核结果">exclusiveGateway>
    <sequenceFlow id="sid-50731902-EF37-4E07-9DED-2E83F7EB54B7" sourceRef="testUser" targetRef="ex_gateway_check">sequenceFlow>
    <endEvent id="end_fail" name="失败结束">endEvent>
    <sequenceFlow id="check_fail" name="审核拒绝" sourceRef="ex_gateway_check" targetRef="end_fail">
      <conditionExpression xsi:type="tFormalExpression">conditionExpression>
    sequenceFlow>
    <sequenceFlow id="check_ok" name="审核通过" sourceRef="ex_gateway_check" targetRef="end">
      <conditionExpression xsi:type="tFormalExpression">conditionExpression>
    sequenceFlow>
  process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_test_bpmn">
    <bpmndi:BPMNPlane bpmnElement="test_bpmn" id="BPMNPlane_test_bpmn">
      <bpmndi:BPMNShape bpmnElement="start" id="BPMNShape_start">
        <omgdc:Bounds height="30.0" width="30.0" x="210.0" y="120.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="end" id="BPMNShape_end">
        <omgdc:Bounds height="28.0" width="28.0" x="630.0" y="60.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="testUser" id="BPMNShape_testUser">
        <omgdc:Bounds height="80.0" width="100.0" x="315.0" y="95.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="ex_gateway_check" id="BPMNShape_ex_gateway_check">
        <omgdc:Bounds height="40.0" width="40.0" x="480.0" y="115.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="end_fail" id="BPMNShape_end_fail">
        <omgdc:Bounds height="28.0" width="28.0" x="630.0" y="180.0">omgdc:Bounds>
      bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="check_fail" id="BPMNEdge_check_fail">
        <omgdi:waypoint x="500.5" y="154.4338310580205">omgdi:waypoint>
        <omgdi:waypoint x="500.5" y="194.0">omgdi:waypoint>
        <omgdi:waypoint x="630.0" y="194.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-8D834F3C-45A8-4C88-9AD1-1AC426CC9002" id="BPMNEdge_sid-8D834F3C-45A8-4C88-9AD1-1AC426CC9002">
        <omgdi:waypoint x="239.94999779398907" y="135.0">omgdi:waypoint>
        <omgdi:waypoint x="315.0" y="135.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="sid-50731902-EF37-4E07-9DED-2E83F7EB54B7" id="BPMNEdge_sid-50731902-EF37-4E07-9DED-2E83F7EB54B7">
        <omgdi:waypoint x="414.95000000000005" y="135.0">omgdi:waypoint>
        <omgdi:waypoint x="480.0" y="135.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="check_ok" id="BPMNEdge_check_ok">
        <omgdi:waypoint x="500.5" y="115.5">omgdi:waypoint>
        <omgdi:waypoint x="500.5" y="74.0">omgdi:waypoint>
        <omgdi:waypoint x="630.0" y="74.0">omgdi:waypoint>
      bpmndi:BPMNEdge>
    bpmndi:BPMNPlane>
  bpmndi:BPMNDiagram>
definitions>

控制器

控制器原来直接是个完成任务现在，我们方便起见拆分为2个一个是通过任务，一个是拒绝任务，如果你的排他网关使用的都是该参数那么就可以通用。

@RequestMapping("/accept")
    @ResponseBody
    public Map<String,Object> acceptTask(@RequestBody @RequestParam(required = false) Map<String,String> paras){
        Map<String,Object> res =new HashMap<>();
        Map<String,String> data = new HashMap<>();

        if (MapUtils.isEmpty(paras)){
            res.put("msg","请输入任务参数");
            res.put("res","0");
            res.put("data",data);
            return res;
        }

        String taskId = paras.get("taskId");
        if (StringUtils.isEmpty(taskId)){
            res.put("msg","请输入任务ID");
            res.put("res","0");
            res.put("data",data);
            return res;
        }

        Map<String,Object> flowParas=new HashMap<>();
        flowParas.putAll(paras);
        flowParas.put("outcome","通过");
        boolean bok = flowService.completeTask(taskId,flowParas);

        if (bok){
            data.put("taskId",taskId);
            res.put("msg","通过任务成功");
            res.put("res","1");
        }
        else {
            data.put("taskId",taskId);
            res.put("msg","通过任务失败");
            res.put("res","0");
        }

        res.put("data",data);
        return res;
    }


    @RequestMapping("/reject")
    @ResponseBody
    public Map<String,Object> rejectTask(@RequestBody @RequestParam(required = false) Map<String,String> paras){
        Map<String,Object> res =new HashMap<>();
        Map<String,String> data = new HashMap<>();

        if (MapUtils.isEmpty(paras)){
            res.put("msg","请输入任务参数");
            res.put("res","0");
            res.put("data",data);
            return res;
        }

        String taskId = paras.get("taskId");
        if (StringUtils.isEmpty(taskId)){
            res.put("msg","请输入任务ID");
            res.put("res","0");
            res.put("data",data);
            return res;
        }

        Map<String,Object> flowParas=new HashMap<>();
        flowParas.putAll(paras);
        flowParas.put("outcome","拒绝");
        boolean bok = flowService.completeTask(taskId,flowParas);

        if (bok){
            data.put("taskId",taskId);
            res.put("msg","拒绝任务成功");
            res.put("res","1");
        }
        else {
            data.put("taskId",taskId);
            res.put("msg","拒绝任务失败");
            res.put("res","0");
        }

        res.put("data",data);
        return res;
    }

流程验证

1. 创建新流程
   替换罪行的流程配置文件，输入创建地址完成创建。
   http://localhost:8989/flow/create
   
2. 启动流程
   http://localhost:8989/flow/start?processKey=test_bpmn，输入改地址完成流程启动
   
   此时查看流程后台，会打印当前的任务ID
   
3. 通过流程
   输入新增的通过地址完成流程审批
   http://localhost:8989/flow/accept?taskId=e7b04115-23c8-11e9-929f-00155d030a00
4. 查看流程图
   进入流程查看地址:http://localhost:8989/flow/processDiagram?processId=e7a71950-23c8-11e9-929f-00155d030a00,查看我们的审批流程走到了最后，而拒绝没有发生变化，说明排他网关成功的区分了两个流程，流程进展如下图所示:
   

代码下载

下载内容已经放到我的CSDN的资源页面，https://download.csdn.net/download/houyj1986/10943791

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