Source code for pykka.gevent
from __future__ import absolute_import
import sys
import gevent
import gevent.event
import gevent.queue
from pykka import Timeout
from pykka.actor import Actor
from pykka.future import Future
__all__ = [
'GeventActor',
'GeventFuture',
]
[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 not None:
self.async_result = async_result
else:
self.async_result = gevent.event.AsyncResult()
[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):
if isinstance(exc_info, BaseException):
exception = exc_info
else:
exc_info = exc_info or sys.exc_info()
exception = exc_info[1]
self.async_result.set_exception(exception)
[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, but as of gevent 0.13.x it does not
work in combination with other threads.
"""
@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)