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# Copyright 2015 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 "system metrics logger" model.
"""
class ICollector(object):
"""This is an abstract class for system metrics loggers.
"""
def start(self):
"""Starts data collection. This method must be non-blocking.
It means, that collector must be executed as a background process.
Where implemented, this function should raise an exception on
failure.
"""
raise NotImplementedError('Please call an implementation.')
def stop(self):
"""Stops data collection.
Where implemented, this function should raise an exception on
failure.
"""
raise NotImplementedError('Please call an implementation.')
def get_results(self):
"""Returns collected results.
Where implemented, this function should raise an exception on
failure.
"""
raise NotImplementedError('Please call an implementation.')
def print_results(self):
"""Logs collected results.
Where implemented, this function should raise an exception on
failure.
"""
raise NotImplementedError('Please call an implementation.')
def __enter__(self):
"""Starts up collection of statistics
"""
self.start()
def __exit__(self, type_, value, traceback):
"""Stops collection of statistics
"""
self.stop()
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