1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
``tornado.concurrent`` --- Work with ``Future`` objects
=======================================================
.. testsetup::
from tornado.concurrent import *
from tornado import gen
.. automodule:: tornado.concurrent
:members:
.. class:: Future
``tornado.concurrent.Future`` is an alias for `asyncio.Future`.
In Tornado, the main way in which applications interact with
``Future`` objects is by ``awaiting`` or ``yielding`` them in
coroutines, instead of calling methods on the ``Future`` objects
themselves. For more information on the available methods, see
the `asyncio.Future` docs.
.. versionchanged:: 5.0
Tornado's implementation of ``Future`` has been replaced by
the version from `asyncio` when available.
- ``Future`` objects can only be created while there is a
current `.IOLoop`
- The timing of callbacks scheduled with
``Future.add_done_callback`` has changed.
- Cancellation is now partially supported (only on Python 3)
- The ``exc_info`` and ``set_exc_info`` methods are no longer
available on Python 3.
|
