torando-ioloop生命周期

https://stackoverflow.com/questions/5375220/how-do-i-stop-tornado-web-server?answertab=votes#tab-top

http://y.tsutsumi.io/keyerror-in-self_handlers-a-journey-deep-into-tornados-internals.html

# coding=utf-8

"""ServerRunner"""

from threading import Thread
from time import sleep

from tornado.ioloop import IOLoop

class ServerRunner(Thread):
    """优化：自动设置为deamon线程"""

    def __init__(self, *servers):
        super(ServerRunner, self).__init__(name="HTTPServer")

        self.__servers = servers
        self.__IOLoop = None

    def run(self):
        """override"""
        self.__start_servers()

        self.__IOLoop = IOLoop.current()
        self.__IOLoop.start()

    def stop(self):
        self.__stop_IO_loop()
        self.__stop_servers()

    def __start_servers(self):
        for server in self.__servers:
            server.start()

    def __stop_IO_loop(self):
        # 当ServerRunner#start()已调用，self.__IOLoop赋值语句还未执行时
        if self.is_alive() and self.__IOLoop is None:
            sleep(0.5)  # 等待线程启动

        if self.__IOLoop is not None:
            self.__IOLoop.add_callback(self.__IOLoop.stop)
            self.__IOLoop = None

    def __stop_servers(self):
        for server in self.__servers:
            server.stop()