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Message from discussion How to call tornado asynchronous function right?
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Jimmy  
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 More options Oct 2 2012, 11:57 pm
From: Jimmy <li.jiam...@gmail.com>
Date: Tue, 2 Oct 2012 20:57:24 -0700 (PDT)
Local: Tues, Oct 2 2012 11:57 pm
Subject: Re: How to call tornado asynchronous function right?
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I don't mean to make it sleep. You can assume the sleep to some heavy load
work, like loop i from 0 to 10000000000. When multiple requests come in
concurrently, I saw the request is executed in sequence, not in parallel
(using yield gen.Task). But the old way of async_callback works.

How to use gen.Task to create async behavior?

On Wednesday, October 3, 2012 5:51:54 AM UTC+8, aliane abdelouahab wrote:

> look here, maybe it will help:

> http://groups.google.com/group/python-tornado/browse_thread/thread/ae...

> On 2 oct, 11:08, Li jiaming <li.jiam...@gmail.com> wrote:
> > I created a simple app with gen.task. But seems doesn't work
> > asynchronously. I try to call /sleep for multiple times, but it handles
> > request in sequence.

> > import tornado.ioloop
> > import tornado.web
> > from tornado.web import asynchronous
> > from tornado import gen
> > import time
> > import tornado.httpserver

> > class MainHandler(tornado.web.RequestHandler):
> >     def get(self):
> >         print 'receive root request'
> >         self.write("Hello, world")

> > class SleepHandler(tornado.web.RequestHandler):
> >     @asynchronous
> >     @gen.engine
> >     def get(self):
> >         print 'receive sleep request'
> >         yield [ gen.Task(self.sleep, 10),
> >                 gen.Task(self.sleep, 9)]
> >         self.write("Wake up")
> >         self.finish()

> >     def sleep(self, sec, callback):
> >         print 'sleep for %d seconds' % sec
> >         time.sleep(sec)
> >         print 'finish sleep %d' % sec
> >         return callback()

> > application = tornado.web.Application([
> >     (r"/", MainHandler),
> >     (r"/sleep", SleepHandler),
> > ])

> > if __name__ == "__main__":
> >     server = tornado.httpserver.HTTPServer(application)
> >     server.listen(8888)
> >     tornado.ioloop.IOLoop.instance().start()

> > *Anything wrong in my code?*

> > I also tried async_callback (which is claimed to be obsoleted way of
> doing
> > async). But it works. It can handle multiple requests in parallel when
> > calling /sleep.

> > class SleepHandler(tornado.web.RequestHandler):
> >     @asynchronous
> >     def get(self):
> >         print 'receive sleep request'
> >         self.async_callback(self.callback_sleep, 10)

> >     def callback_sleep(self, sec):
> >         print 'callback sleep for %d seconds' % sec
> >         time.sleep(sec)
> >         print 'finish callback sleep for %d seconds' % sec
> >         self.write('wake up')
> >         self.finish()


 
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