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# Copyright 2017, Google LLC
#
# 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.
"""Abstract and helper bases for Future implementations."""
import abc
class Future(object, metaclass=abc.ABCMeta):
# pylint: disable=missing-docstring
# We inherit the interfaces here from concurrent.futures.
"""Future interface.
This interface is based on :class:`concurrent.futures.Future`.
"""
@abc.abstractmethod
def cancel(self):
raise NotImplementedError()
@abc.abstractmethod
def cancelled(self):
raise NotImplementedError()
@abc.abstractmethod
def running(self):
raise NotImplementedError()
@abc.abstractmethod
def done(self):
raise NotImplementedError()
@abc.abstractmethod
def result(self, timeout=None):
raise NotImplementedError()
@abc.abstractmethod
def exception(self, timeout=None):
raise NotImplementedError()
@abc.abstractmethod
def add_done_callback(self, fn):
# pylint: disable=invalid-name
raise NotImplementedError()
@abc.abstractmethod
def set_result(self, result):
raise NotImplementedError()
@abc.abstractmethod
def set_exception(self, exception):
raise NotImplementedError()
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