Tornado example with non-blocking background tasks executed in thread pool

tornado_background.py

import time

from tornado import (
  concurrent,
  gen,
  httpserver,
  ioloop,
  log,
  web
)


log.enable_pretty_logging()

# exector to schedule async task in background
executor = concurrent.futures.ThreadPoolExecutor(8)


class MainHandler(web.RequestHandler):
  
  def get(self):
    def task(t):
      time.sleep(t)
      print("\nCallback complete\n")
    executor.submit(task, 10)
    self.write("Request accepted\n")

    
def make_app():
  return web.Application([
    (r"/", MainHandler)
  ],
    debug=False)


def main():
  app = make_app()
  
  # start server
  server = httpserver.HTTPServer(app)
  server.listen(8080)
  
  print('starting IOLoop')
  ioloop.IOLoop.current().start()
  
 
if __name__ == "__main__":
  main()