工作流3-API(2)

TaskService

参考：https://blog.****.net/luckyzhoustar/article/details/48630555

1. 新建一个userTask bpmn，设置两个候选人：
   

<?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="mySimple1" name="我的申请1" isExecutable="true">
    <startEvent id="startEvent" name="开始"></startEvent>
    <userTask id="userApply" name="测试1" activiti:candidateUsers="whb,user1">
      <documentation>some task ${message}</documentation>
    </userTask>
    <sequenceFlow id="flow1" sourceRef="startEvent" targetRef="userApply"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow2" sourceRef="userApply" targetRef="endevent1"></sequenceFlow>
  </process>
</definitions>

在userTask上配置了一个变量占位符 ${message}。

//流程引擎对象
    ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
    //TaskService
    @Test
    public void testTaskService(){
        //1.部署流程定义
        Deployment deployment = processEngine.getRepositoryService()
                .createDeployment()
                .addClasspathResource("diagrams/Simple1.bpmn")
                .deploy();
        logger.info("deployment信息id：{}",deployment.getId());//deployment信息id：45001

        Map<String,Object> variables = Maps.newHashMap();
        variables.put("message","testMessage!");

        //2.启动流程实例,携带变量
        ProcessInstance processInstance = processEngine.getRuntimeService().startProcessInstanceByKey("mySimple1",variables);
        logger.info("流程实例ID:{}", processInstance.getId());//流程实例ID:45004
        logger.info("流程定义ID:{}",processInstance.getProcessDefinitionId());//流程定义ID:mySimple1:1:45003

        //3.查询task
        TaskService taskService = processEngine.getTaskService();
        Task task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
        logger.info("task:{}",ToStringBuilder.reflectionToString(task,ToStringStyle.JSON_STYLE));
        //流程中的${message}变量替换了
        //task:{"revision":1,"owner":null,"assignee":null,"initialAssignee":null,"delegationState":null,"parentTaskId":null,"name":"测试1","localizedName":null,"description":"some task testMessage!","localizedDescription":null,"priority":50,"createTime":"Thu Mar 14 16:49:44 CST 2019","dueDate":null,"suspensionState":1,"category":null,"isIdentityLinksInitialized":false,"taskIdentityLinkEntities":[],"executionId":"52504","execution":null,"processInstanceId":"52504","processInstance":null,"processDefinitionId":"mySimple1:4:52503","taskDefinition":null,"taskDefinitionKey":"userApply","formKey":null,"isDeleted":false,"eventName":null,"tenantId":"","queryVariables":null,"forcedUpdate":false,"variableInstances":null,"usedVariablesCache":{},"cachedElContext":null,"id":"52508"}

        //4.设置变量，并查看本地变量等
        taskService.setVariable(task.getId(),"变量名1","值1");
        taskService.setVariableLocal(task.getId(),"本地变量名1","本地值1");

        Map<String, Object> variables1 = taskService.getVariables(task.getId());
        Map<String, Object> variablesLocal = taskService.getVariablesLocal(task.getId());
        Map<String, Object> processVariables = processEngine.getRuntimeService().getVariables(task.getExecutionId());
        //三种变量的范围
        logger.info("-- variables1:{}",variables1);//范围大：task变量都能获得
        logger.info("-- variablesLocal:{}",variablesLocal);//只能获取设置到的local变量
        logger.info("-- processVariables:{}",processVariables);//除了local
        //-- variables1:{变量名1=值1, 本地变量名1=本地值1, message=testMessage!}
        //-- variablesLocal:{本地变量名1=本地值1}
        //-- processVariables:{变量名1=值1, message=testMessage!}
        
        //当taskComplete后，task将为null
        taskService.complete(task.getId());
    }