Tornado IOLoop.ipynb

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     "input": "import zmq\nfrom zmq.eventloop import ioloop\nfrom zmq.eventloop.zmqstream import ZMQStream\n\nfrom tornado import gen\nfrom tornado.concurrent import Future\n\nimport datetime\n\ndef recv_future(socket):\n    zmqstream = ZMQStream(socket)  # Required for ZMQ\n    future = Future()\n    def _finish(reply):\n        future.set_result(reply)\n    zmqstream.on_recv(_finish)\n    return future\n\n@gen.coroutine\ndef f():\n    i = zmq.Context.instance()\n    sock = i.socket(zmq.REQ)\n    sock.connect('tcp://localhost:9005')\n    sock.send('Ping')\n    msg = yield recv_future(sock)\n    print \"Received {}\".format(msg[0])\n    raise gen.Return(msg)\n    \ni  = ioloop.IOLoop.instance()\ndt = datetime.timedelta(seconds=4)\n\na = ioloop.PeriodicCallback(f, 2000)\na.start()",
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       "text": "Received Pong!\nReceived Pong!"
      },
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       "text": "Received Pong!\n"
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