activiti任务TASK

一、概要

1. 设计TASK的表主要是：ACT_RU_TASK，ACT_HI_TASKINST（见参考-activiti表）；
2. 任务主要有：人工任务（usertask）,服务任务（servicetask）等；
3. 候选人/候选组（candidate）：可以执行任务的一类人或者多个组，候选人/候选组中都可以去签收任务，一旦某人签收，就成为受理人，其他人就不能再签收受理此任务；usertask流程图中，candidate标示候选；候选人涉及的表ACT_RU_IDENTITYLINK;
4. 受理人（assignee）：有两种情况，一种是候选人/组中有人签收任务后成为受理人，另外一种是流程图中直接指定受理人，但是可以指定一个动态受理人；受理人涉及的表ACT_RU_TASK;
5. 持有人（owner）：持有人设置主要是存入历史表中，用于历史任务的查询，涉及的表ACT_HI_TASKINST；

二、任务操作

1. 创建TASK任务与设置权限：可以使用代码创建任务，但是实际操作中都是绘制流程图。绘制TASK后，在属性可以设置候选人和受理人，一般都是设置候选人，因为固定受理人不太符合程序变动；

          候选人设置了deptleader，该值将部署在表ACT_RU_IDENTITYLINK中，查看xml看见：　　　　

//设置了候选组
 <userTask id="deptLeaderAudit" name="部门领导审批" activiti:candidateGroups="deptLeader">
 </userTask>

　　　 完整的XML（无图形位置信息）

<process id="leave" name="请假流程" isExecutable="true">
    <documentation>请假流程演示</documentation>
    <startEvent id="startevent1" name="Start" activiti:initiator="applyUserId"></startEvent>
    <userTask id="deptLeaderAudit" name="部门领导审批" activiti:candidateGroups="deptLeader"></userTask>
    <exclusiveGateway id="exclusivegateway5" name="Exclusive Gateway"></exclusiveGateway>
    <userTask id="modifyApply" name="调整申请" activiti:assignee="${applyUserId}">
      <extensionElements>
        <activiti:taskListener event="complete" delegateExpression="${afterModifyApplyContentProcessor}"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <userTask id="hrAudit" name="人事审批" activiti:candidateGroups="hr"></userTask>
    <exclusiveGateway id="exclusivegateway6" name="Exclusive Gateway"></exclusiveGateway>
    <userTask id="reportBack" name="销假" activiti:assignee="${applyUserId}">
      <extensionElements>
        <activiti:taskListener event="complete" delegateExpression="${reportBackEndProcessor}"></activiti:taskListener>
      </extensionElements>
    </userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <exclusiveGateway id="exclusivegateway7" name="Exclusive Gateway"></exclusiveGateway>
    <sequenceFlow id="flow2" sourceRef="startevent1" targetRef="deptLeaderAudit"></sequenceFlow>
    <sequenceFlow id="flow3" sourceRef="deptLeaderAudit" targetRef="exclusivegateway5"></sequenceFlow>
    <sequenceFlow id="flow4" name="不同意" sourceRef="exclusivegateway5" targetRef="modifyApply">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${!deptLeaderPass}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow5" name="同意" sourceRef="exclusivegateway5" targetRef="hrAudit">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${deptLeaderPass}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow6" sourceRef="hrAudit" targetRef="exclusivegateway6"></sequenceFlow>
    <sequenceFlow id="flow7" name="同意" sourceRef="exclusivegateway6" targetRef="reportBack">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${hrPass}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow8" sourceRef="reportBack" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow9" name="不同意" sourceRef="exclusivegateway6" targetRef="modifyApply">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${!hrPass}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow10" name="重新申请" sourceRef="exclusivegateway7" targetRef="deptLeaderAudit">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${reApply}]]></conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="flow11" sourceRef="modifyApply" targetRef="exclusivegateway7"></sequenceFlow>
    <sequenceFlow id="flow12" name="结束流程" sourceRef="exclusivegateway7" targetRef="endevent1">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${!reApply}]]></conditionExpression>
    </sequenceFlow>
  </process>

         2.查询候选任务

    //根据候选组ID查询拥有任务
    List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup(groupA.getId()).list();
    for (Task task : tasks){
　　　　System.out.println(task.getName());
　　}    
    //根据用户ID查询任务
    tasks = taskService.createTaskQuery().taskCandidateUser(user.getId()).list();
    for (Task task : tasks){
　　　　System.out.println(task.getName());
　　}

    //调用taskCandidateGroupIn
    List<String> groupIds = new ArrayList<String>();
    groupIds.add(groupA.getId());
    groupIds.add(groupB.getId());

    tasks = taskService.createTaskQuery().taskCandidateGroupIn(groupIds).list();
    for (Task task : tasks){
　　　　System.out.println(task.getName());
　　}
     
    //查询权限数据
    List<IdentityLink> links = taskService.getIdentityLinksForTask(tasks.get(0).getId());
    System.out.println("关系数据量: " + links.size());}