rlr · February 21, 2010 20:26 · Dec 1, 2009 · Dec 1, 2009 · Dec 1, 2009
diff --git a/polling_example.py b/polling_example.py
@@ -21,7 +21,7 @@ def get(self):
     def _check(self):
         if self._are_where_there_yet():
             self.scheduler.stop()
-            self.write("Hello, World!")
+            self.write("Hello, world")
             self.finish()
 
     def _are_where_there_yet(self):

diff --git a/polling_example.py b/polling_example.py
@@ -21,7 +21,7 @@ def get(self):
     def _check(self):
         if self._are_where_there_yet():
             self.scheduler.stop()
-            self.write("CHANGE DETECTED!")
+            self.write("Hello, World!")
             self.finish()
 
     def _are_where_there_yet(self):

diff --git a/polling_example.py b/polling_example.py
@@ -0,0 +1,44 @@
+import logging
+import random
+
+import tornado.httpserver
+import tornado.ioloop
+import tornado.options
+import tornado.web
+
+from tornado.options import define, options
+
+define("port", default=8888, help="run on the given port", type=int)
+
+
+class MainHandler(tornado.web.RequestHandler):
+    @tornado.web.asynchronous
+    def get(self):
+        import tornado.ioloop
+        self.scheduler = tornado.ioloop.PeriodicCallback(self._check, 1e3)
+        self.scheduler.start()
+
+    def _check(self):
+        if self._are_where_there_yet():
+            self.scheduler.stop()
+            self.write("CHANGE DETECTED!")
+            self.finish()
+
+    def _are_where_there_yet(self):
+        n = random.randint(1,10)
+        logging.info("current value: %s", n)
+        return n == 5
+
+
+def main():
+    tornado.options.parse_command_line()
+    application = tornado.web.Application([
+        (r"/", MainHandler),
+    ])
+    http_server = tornado.httpserver.HTTPServer(application)
+    http_server.listen(options.port)
+    tornado.ioloop.IOLoop.instance().start()
+
+
+if __name__ == "__main__":
+    main()