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# Copyright 2016 Intel Corporation.
#
# 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 "packet forwarding" model.
This is an abstract class for packet forwarders.
"""
class IPktFwd(object):
"""Interface class that is implemented by specific classes
of packet forwarders
"""
def __enter__(self):
"""Start the packet forwarder.
Provide a context manager interface to the packet forwarders.
This simply calls the :func:`start` function.
"""
return self.start()
def __exit__(self, type_, value, traceback):
"""Stop the packet forwarder.
Provide a context manager interface to the packet forwarders.
This simply calls the :func:`stop` function.
"""
self.stop()
def start(self):
"""Start the packet forwarder.
:returns: None
"""
raise NotImplementedError('Please call an implementation.')
def stop(self):
"""Stop the packet forwarder.
:returns: None
"""
raise NotImplementedError('Please call an implementation.')
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