自定义组件，并在组件中注入自定义组件实现多种场景的下的组件切换

场景：

表单有多种，例如加班、出差、费用申请等，对表单做审批动作时，包含同意、驳回、关闭等操作，所以同一个审批动作必须只有一个入口。

但是：

不同表单在审批时业务不一样，例如，加班表单，在提交加班申请后需要计算加班时长；
出差表单在提交后需要计算出差天数；
显然加班时长和出差天数的字段是不同的，并且需要保存的数据库表也是不同的。

所以：

• 我们可以定义加班套件service、出差套件service

interface FormDataPlugin { 

	fun delete(data: FormData)
	
	fun processData(data: FormData, form: Form, definition: FormDefinition): ProcessResult
	
}

// 加班service实现类
@Component
class OvertimeWorkPlugin : FormDataPlugin { 
	@Autowired
  lateinit var repository: OvertimeWorkRepository

  @Autowired
  private lateinit var checkInRuleRepository: UserCheckInRuleRepository

  override fun delete(data: FormData) {
    repository.deleteById(data.id)
  }

  override fun processData(data: FormData, form: Form, definition: FormDefinition): ProcessResult {
    val field = definition.children.find { it.componentName == FormFieldType.OvertimeWorkSuit }
    if (field != null) {
      val formFieldValue = data.value[field.props.id]
      val overtime = formFieldValue!! as HrOvertimeWork
      overtime.ownerId = getCurrentUser().id
      overtime.createTime = Date()
      overtime.id = data.id
      overtime.state = data.state
      validate(overtime)

      overtime.duration = getCurrentUserOvertimeWorkDuration(overtime.ownerId!!, overtime.begin!!, overtime.end!!)
      if (repository.existsById(overtime.id)) {
        repository.updateById(
            overtime.id, Update.update(HrOvertimeWork.Q.reason, overtime.reason)
            .set(HrOvertimeWork.Q.state, overtime.state)
            .set(HrOvertimeWork.Q.begin, overtime.begin)
            .set(HrOvertimeWork.Q.end, overtime.end)
            .set(HrOvertimeWork.Q.overtimeType, overtime.overtimeType)
            .set(HrOvertimeWork.Q.duration, getCurrentUserOvertimeWorkDuration(overtime.ownerId!!, overtime.begin!!, overtime.end!!))
        )
      } else {
        repository.save(overtime)
      }
    }
    return ProcessResult()
  }


// 出差service实现类
@Component
class TravelPlugin : FormDataPlugin { 
	@Autowired
  lateinit var travelRepository: TravelRepository

  override fun delete(data: FormData) {
    travelRepository.deleteById(data.id)
  }

  override fun processData(data: FormData, form: Form, definition: FormDefinition): ProcessResult {
    val field = definition.children.find { it.componentName == FormFieldType.TravelSuit }
    // 如果添加了出差套件
    if (field != null) {
      val formFieldValue = data.value[field.props.id]
      val travel: HrTravel = formFieldValue!! as HrTravel
      travel.id = data.id
      travel.state = data.state
      travel.ownerId = getCurrentUser().id
      validateDate(travel.begin, travel.end)
      travel.travelDays = getWorkDaysByDateInterval(travel.begin!!, travel.end!!)
      if (travelRepository.existsById(travel.id)) {
        travelRepository.updateById(
            travel.id, Update.update(HrTravel.Q.reason, travel.reason)
            .set(HrTravel.Q.state, travel.state)
            .set(HrTravel.Q.begin, travel.begin)
            .set(HrTravel.Q.end, travel.end)
            .set(HrTravel.Q.fromCityId, travel.fromCityId)
            .set(HrTravel.Q.destinationCityId, travel.destinationCityId)
            .set(HrTravel.Q.vehicleId, travel.vehicleId)
            .set(HrTravel.Q.travelDays, travel.travelDays)
        )
      } else {
        travelRepository.save(travel)
      }
    }
    return ProcessResult()
  }	
}

}

此时定义好了加班和出差套件service，审批表单的入口service如下

@Service
@ScheduleCallable(name = "审批表单")
class FormDataServiceImpl : FormDataService { 

	// 这里是关键，使用Spring的自动注入，将 FormDataPlugin 的实现类全部注入进来
	@Autowired(required = false)
    private var formDataPlugins: List<FormDataPlugin> = listOf()

	// 审批同意、驳回等操作时，遍历我们的套件，执行处理
	override fun agree(vo: HandlingOpinionsVO, user: DetailsUser) {
    formDataLockService.doWithWriteLock(vo.formDataId) {
      val formData = repository.findById(vo.formDataId).get()
      mergeFormData(formData, vo.value)
      commonDataService.doAgree(formData, vo, user)
      doUpdate(formData, vo)
      if (formData.dataType == FormDataSubmitType.NormalSubmission) {
        formDataPlugins.forEach { plugin ->
          plugin.updateState(formData)
        }
      }
    }
  }

}

以上代码只做思路记录，为设计表单功能时提供参考