gevent动态随时添加任务

 保持和py的Threadpoolexecutor一样的submit 方法名，是程序更容易在两种模式之间切换。

class GeventPoolExecutor(LoggerMixin):
    def __init__(self, max_works, ):
        self._q = JoinableQueue(maxsize=max_works)
        # self._q = Queue(maxsize=max_works)
        for _ in range(max_works):
            gevent.spawn(self.__worker)
        atexit.register(self.__atexit)

    def __worker(self):
        while True:
            fn,args,kwargs = self._q.get()
            try:
                fn(*args,**kwargs)
            except Exception as exc:
                self.logger.exception(f'函数 {fn.__name__} 中发生错误，错误原因是 {type(exc)} {exc} ')
            finally:
                pass
                self._q.task_done()

    def submit(self, fn:Callable,*args,**kwargs):
        self._q.put((fn,args,kwargs))

    def __atexit(self):
        self.logger.critical('想即将退出程序。')
        self._q.join()