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deprecation.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2015 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Invenio deprecation policy.
A minor release version (``A.B``) may deprecate certain features from previous
releases. If a feature is deprecated in version ``A.B`` it will continue to
work in version ``A.B`` and ``A.(B+1)`` but raise warnings. It will be
completely removed in version ``A.(B+2)``.
Example:
- Feature X is mark in version *2.0* as deprecated. The feature will still
work, but it will issue the silent warning ``RemovedInInvenio22Warning``
(`PendingDeprecationWarning`).
- Version *2.1* still contains the feature, but the warning
``RemovedInInvenio22Warning`` is now loud by default (`DeprecationWarning`).
- Version *2.2* will completely remove the feature.
Fast track deprecation
----------------------
Poorly tested, non-core and little used features for which alternatives already
exists in Invenio may opt to use fast track deprecation. If a feature is
fast track deprecated in version ``A.B`` it will continue to work in version
``A.B`` but raise loud warnings. It will be completely removed in version
``A.(B+1)``.
Fast track deprecation is only to be used in exceptional cases for features
that essentially nobody uses. In addition, if a fast track deprecation after
being accepted is found to have significant impact on a minority of the
community, it may be postponed to follow the standard deprecation policy.
How to deprecate a feature
--------------------------
1. Open a RFC issue on GitHub to allow discussion of the proposed
feature deprecation.
2. Issue a deprecation warning for the feature in the latest ``maint``
branch.
.. code-block:: python
import warnings
from invenio.utils.deprecation import RemovedInInvenio22Warning
def old_method(a, b):
warnings.warn(
"Use of old_method is deprecated. Please use new_method instead.",
RemovedInInvenio22Warning
)
# ...
If desired, you may already rewrite the body of ``old_method()``, but it must
be API backward compatible so that existing code does not break. Please start
fixing all places ``old_method`` is used, so that it can be easily removed
once Invenio v2.1 has been released.
"""
class RemovedInInvenio22Warning(PendingDeprecationWarning):
"""Mark feature that will be removed in Invenio version 2.2."""
class RemovedInInvenio21Warning(DeprecationWarning):
"""Mark feature that will be removed in Invenio version 2.1."""

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