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cache_results.py
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Tue, Dec 24, 07:45

cache_results.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.
"""Query results cacher."""
from invenio.modules.search.cache import get_results_cache, set_results_cache
class CacheOp(object):
"""Store results in cache."""
def __init__(self, query, collection=None):
"""Define query that should be cached."""
self.query = query
self.collection = collection
def __repr__(self):
"""Object representation."""
return "%s(%s)" % (self.__class__.__name__, repr(self.query))
def accept(self, visitor):
"""Store intermediate results to the cache."""
results = get_results_cache(str(self.query), self.collection)
if results is None:
results = self.query.accept(visitor)
set_results_cache(results, str(self.query), self.collection)
return results
def apply(query, collection=None, **kwargs):
"""Decorate query with a cache operator."""
return CacheOp(query, collection=collection)

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