龙卷风相当于延迟

Question

在龙卷风中是否有等效的命令用于延迟功能而不影响主进程进入休眠状态(因此即使主线程正在分析新的函数调用,回调也会执行)

Answer 1

试试这个:

import time
from tornado.ioloop import IOLoop
from tornado.web import RequestHandler, asynchronous
from tornado import gen

class MyHandler(RequestHandler):
    @asynchronous
    @gen.engine
    def get(self):
        self.write("sleeping .... ")
        self.flush()
        # Do nothing for 5 sec
        yield gen.Task(IOLoop.instance().add_timeout, time.time() + 5)
        self.write("I'm awake!")
        self.finish()

取自这里.

Answer 2

请注意,自4.1以来,他们添加了一种gen.sleep(delay)方法.

所以

yield gen.Task(IOLoop.instance().add_timeout, time.time() + 5)

会成为

yield gen.sleep(5)

Answer 3

可能是多余的

我喜欢回调风格

class MyHandler(RequestHandler):
    @asynchronous
    def get(self):
        self.write("sleeping .... ")
        self.flush()
        IOLoop.instance().add_timeout(time.time() + 5, self._process)

    def _process(self)
        # Do nothing for 5 secs
        self.write("I'm awake!")
        self.finish()