# 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.

import abc
import six

from stevedore import driver


@six.add_metaclass(abc.ABCMeta)
class Scheduler(object):

    def __init__(self):
        self.pod_manager = driver.DriverManager(
            namespace='tricircle.common.schedulers',
            name='pod_manager',
            invoke_on_load=True
        ).driver

    @abc.abstractmethod
    def select_destination(self, context, az_name, tenant_id, spec_obj):
        return None, None