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

Try this:

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()

Taken from here .

Answer 2

Note that since 4.1 they've added a gen.sleep(delay) method.

so

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

would just become

yield gen.sleep(5)

Answer 3

May be redundant

I like callback style

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()