# -*- coding:utf-8 -*-

import tornado.httpserver import tornado.ioloop import tornado.options import tornado.web

import tornado.gen

from tornado.concurrent import run_on_executor from concurrent.futures import ThreadPoolExecutor import time from tornado.options import define, options define("port", default=8000, help="run on the given port", type=int)

class SleepHandler(tornado.web.RequestHandler):     executor = ThreadPoolExecutor(200)

    @tornado.web.asynchronous

    @tornado.gen.coroutine     def get(self):         # 假如你执行的异步会返回值被继续调用可以这样(只是为了演示),否则直接yield就行         print 'a'         res = yield self.sleep()         self.write("when i sleep %s s" % res)         print 'b'         self.finish()

    @run_on_executor

    def sleep(self):         time.sleep(5)         return 5

class JustNowHandler(tornado.web.RequestHandler):     def get(self):         self.write("i hope just now see you")

if __name__ == "__main__":     tornado.options.parse_command_line()     app = tornado.web.Application(handlers=[             (r"/sleep", SleepHandler), (r"/justnow", JustNowHandler)])     http_server = tornado.httpserver.HTTPServer(app)     http_server.listen(options.port)     tornado.ioloop.IOLoop.instance().start()