Stopping a tornado application

python, tornado

Solution

`Application.listen()` method actually creates a `HTTPServer` and calls its `listen()` medthod. `HTTPServer` objects has `stop()` method which is probably what you need. But in order to do it you have to explicitly create `HTTPServer` object in your script.

server = HTTPServer(application)
server.listen(8888)
tornado.ioloop.IOLoop.instance().start()

#somewhere in your code
server.stop()

Problem

Let's take the hello world application in the Tornado home page: ``` import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") application = tornado.web.Application([ (r"/", MainHandler), ]) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start() ``` Is there a way, after the IOloop has been started and without stopping it, to essentially stop the application and start another one (on the same port or on another)? I saw that I can add new application (listening on different ports) at runtime, but I do not know how I could stop existing ones.

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