tornado equivalent of delay

Question

Is there an equivalent command in tornado for delay function without affecting the main process to sleep (thus the callbacks would execute even when the main thread is dealy

Answer 1

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()

Answer 2

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 3

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)