Source code for actors.utils.ask
# -*- coding: utf-8 -*-
#
# Copyright 2015 Thomas Amland
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from actors.future import Promise
from actors.ref import ActorRef
[docs]class PromiseActorRef(ActorRef):
def __init__(self):
super(PromiseActorRef, self).__init__(None)
self.promise = Promise()
[docs] def tell(self, message, sender=None):
self.promise.complete(message)
[docs]def ask(actor, message):
"""
Send a message to `actor` and return a :class:`Future` holding a possible
reply.
To receive a result, the actor MUST send a reply to `sender`.
:param actor:
:type actor: :class:`ActorRef`.
:param message:
:type message: :type: Any
:return: A future holding the result.
"""
sender = PromiseActorRef()
actor.tell(message, sender)
return sender.promise.future