atom.app.Kie.scala Maven / Gradle / Ivy

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package atom.app

import atom.app.KieActivity.ACTIVITY
import org.kie.api.runtime.process.{WorkItem, WorkItemManager, WorkflowProcessInstance}
import org.kie.internal.runtime.StatefulKnowledgeSession

/**
 * Вспомогательный класс для взаимодействия с KIE.
 *
 * @author Alex Voloshyn
 * @version 1.0 3/3/15
 */
trait Kie {
  /**
   * Экземплят текущей сессии KIE.
   */
  val session: StatefulKnowledgeSession

  /**
   * Завершение работы блока и делегирование дальнейшей обработки процессом.
   *
   * @param manager менеджер рабочих блоков
   * @param item экземпляр блока для завершения работы
   */
  protected def complete(manager: WorkItemManager)
                        (implicit item: WorkItem): Unit = {
    manager.completeWorkItem(item.getId, item.getParameters)
  }

  /**
   * Получение значения входящей переменной блока.
   *
   * @param param название переменной
   * @param item экземпляр блока для получения значения
   * @return значение переменной блока
   */
  protected def get(param: String)(implicit item: WorkItem): String = {
    item.getParameters.remove(param).asInstanceOf[String]
  }

  /**
   * Получение значения входящей переменной блока либо `None`.
   *
   * @param param название переменной
   * @param item экземпляр блока для получения значения
   * @return значение переменной блока
   */
  protected def option(param: String)
                      (implicit item: WorkItem): Option[String] = {
    if (item.getParameters.containsKey(param)) {
      Some(item.getParameters.remove(param).asInstanceOf[String])
    } else {
      None
    }
  }

  /**
   * Получение экземпляра текушей активности пользователя.
   *
   * @param item экземпляр текущего блока процесса
   * @return экземпляр текушей активности пользователя
   */
  protected def getActivity(implicit item: WorkItem): Activity = {
    getVariable(ACTIVITY).asInstanceOf[Activity]
  }

  /**
   * Получение значение переменной процесса.
   *
   * @param name имя переменной процесса
   * @param item экземпляр текущего блока процесса
   * @return значение переменной процесса
   */
  protected def getVariable(name: String)(implicit item: WorkItem): AnyRef = {
    val variables =
      session.getProcessInstance(item.getProcessInstanceId)
        .asInstanceOf[WorkflowProcessInstance]
    variables.getVariable(name)
  }
}