tornado/docs/asyncio.rst

``tornado.platform.asyncio`` --- Bridge between ``asyncio`` and Tornado
=======================================================================

.. module:: tornado.platform.asyncio

.. versionadded:: 3.2

This module integrates Tornado with the ``asyncio`` module introduced
in Python 3.4 (and available `as a separate download
<https://pypi.python.org/pypi/asyncio>`_ for Python 3.3).  This makes
it possible to combine the two libraries on the same event loop.

Most applications should use `AsyncIOMainLoop` to run Tornado on the
default ``asyncio`` event loop.  Applications that need to run event
loops on multiple threads may use `AsyncIOLoop` to create multiple
loops.

.. py:class:: AsyncIOMainLoop

    ``AsyncIOMainLoop`` creates an `.IOLoop` that corresponds to the
    current ``asyncio`` event loop (i.e. the one returned by
    ``asyncio.get_event_loop()``).  Recommended usage::

        from tornado.platform.asyncio import AsyncIOMainLoop
        import asyncio
        AsyncIOMainLoop().install()
        asyncio.get_event_loop().run_forever()

.. py:class:: AsyncIOLoop

    ``AsyncIOLoop`` is an `.IOLoop` that runs on an ``asyncio`` event loop.
    This class follows the usual Tornado semantics for creating new
    ``IOLoops``; these loops are not necessarily related to the
    ``asyncio`` default event loop.  Recommended usage::

        from tornado.ioloop import IOLoop
        IOLoop.configure('tornado.platform.asyncio.AsyncIOLoop')
        IOLoop.instance().start()