Source code for spinn_utilities.abstract_context_manager
# Copyright (c) 2017 The University of Manchester
#
# 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
#
# https://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.
from .abstract_base import AbstractBase, abstractmethod
[docs]class AbstractContextManager(object, metaclass=AbstractBase):
"""
Closeable class that supports being used as a simple context manager.
"""
__slots__ = []
[docs] @abstractmethod
def close(self):
"""
How to actually close the underlying resources.
"""
def _context_entered(self):
"""
Called when the context is entered. The result is ignored.
"""
def _context_exception_occurred(self, exc_type, exc_val, exc_tb):
"""
Called when an exception occurs during the `with` context, *after*
the context has been closed.
:param type exc_type:
:param object exc_val:
:param traceback exc_tb:
"""
def __enter__(self):
self._context_entered()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()
if exc_type:
self._context_exception_occurred(exc_type, exc_val, exc_tb)
return False