مشکل در درخواست های همزمان در Tornado

Here’s a complete sample Tornado app that uses the Async HTTP client and the gen.Task module to make things simple.If you read more about gen.Task in the docs you’ll see that you can actually dispatch multiple requests at the same time. This is using the core idea of Tornado where everything is no blocking and still maintaining a single process. 

Update: I’ve added a Thread handler to demonstrate how you could dispatch work into a second thread and receive the callback() when it’s done.

import os
import threading
import tornado.options
import tornado.ioloop
import tornado.httpserver
import tornado.httpclient
import tornado.web
from tornado import gen
from tornado.web import asynchronous

tornado.options.define('port', type=int, default=9000, help='server port number (default: 9000)')
tornado.options.define('debug', type=bool, default=False, help='run in debug mode with autoreload (default: False)')

class Worker(threading.Thread):
   def __init__(self, callback=None, *args, **kwargs):
        super(Worker, self).__init__(*args, **kwargs)
        self.callback = callback

   def run(self):
        import time
        time.sleep(10)
        self.callback('DONE')

class Application(tornado.web.Application):
    def __init__(self):
        handlers = [
            (r"/", IndexHandler),
            (r"/thread", ThreadHandler),
        ]
        settings = dict(
            static_path = os.path.join(os.path.dirname(__file__), "static"),
            template_path = os.path.join(os.path.dirname(__file__), "templates"),
            debug = tornado.options.options.debug,
        )
        tornado.web.Application.__init__(self, handlers, **settings)

class IndexHandler(tornado.web.RequestHandler):
    client = tornado.httpclient.AsyncHTTPClient()

    @asynchronous
    @gen.engine
    def get(self):
        response = yield gen.Task(self.client.fetch, "http://google.com")

        self.finish("Google's homepage is %d bytes long" % len(response.body))

class ThreadHandler(tornado.web.RequestHandler):
    @asynchronous
    def get(self):
        Worker(self.worker_done).start()

    def worker_done(self, value):
        self.finish(value)

def main():
    tornado.options.parse_command_line()
    http_server = tornado.httpserver.HTTPServer(Application())
    http_server.listen(tornado.options.options.port)
    tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
    main()