RunState 类
定义运行可以处于的状态。
构造函数
RunState()属性
CANCEL_RUN
CANCEL_RUN = 'canceled'COMPLETE_RUN
COMPLETE_RUN = 'completed'FAIL_RUN
FAIL_RUN = 'failed'PREPARE_RUN
PREPARE_RUN = 'preparing'START_RUN
START_RUN = 'running'