from __future__ import absolute_import
import sys
import warnings
import gevent
import gevent.event
import gevent.queue
from pykka import Actor, Future, Timeout
__all__ = ['GeventActor', 'GeventFuture']
warnings.warn(
"eventlet support is deprecated and will be removed in Pykka 3.0.",
DeprecationWarning,
)
[docs]class GeventFuture(Future):
"""
:class:`GeventFuture` implements :class:`pykka.Future` for use with
:class:`GeventActor`.
It encapsulates a :class:`gevent.event.AsyncResult` object which may be
used directly, though it will couple your code with gevent.
"""
#: The encapsulated :class:`gevent.event.AsyncResult`
async_result = None
def __init__(self, async_result=None):
super(GeventFuture, self).__init__()
if async_result is None:
async_result = gevent.event.AsyncResult()
self.async_result = async_result
[docs] def get(self, timeout=None):
try:
return super(GeventFuture, self).get(timeout=timeout)
except NotImplementedError:
pass
try:
return self.async_result.get(timeout=timeout)
except gevent.Timeout as e:
raise Timeout(e)
[docs] def set(self, value=None):
assert not self.async_result.ready(), 'value has already been set'
self.async_result.set(value)
[docs] def set_exception(self, exc_info=None):
assert exc_info is None or len(exc_info) == 3
exc_info = exc_info or sys.exc_info()
self.async_result.set_exception(exc_info[1], exc_info=exc_info)
[docs]class GeventActor(Actor):
"""
:class:`GeventActor` implements :class:`pykka.Actor` using the `gevent
<http://www.gevent.org/>`_ library. gevent is a coroutine-based Python
networking library that uses greenlet to provide a high-level synchronous
API on top of libevent event loop.
This is a very fast implementation.
"""
@staticmethod
def _create_actor_inbox():
return gevent.queue.Queue()
@staticmethod
def _create_future():
return GeventFuture()
def _start_actor_loop(self):
gevent.Greenlet.spawn(self._actor_loop)