# Copyright (C) 2011 OpenStack 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.

'''Frontends for burrow.'''

import burrow


class Frontend(burrow.Module):
    '''Interface that frontend implementations must provide.'''

    def __init__(self, config, backend):
        super(Frontend, self).__init__(config)
        self.backend = backend

    def run(self, thread_pool):
        '''Run the frontend instance, adding any threads to the
        thread_pool if needed.'''
        pass
