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- #!/usr/bin/env python
- # -*- coding: utf-8 -*-
- #
- # Copyright (c) 2012, lepture.com
- #
- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions
- # are met:
- #
- # * Redistributions of source code must retain the above copyright
- # notice, this list of conditions and the following disclaimer.
- # * Redistributions in binary form must reproduce the above
- # copyright notice, this list of conditions and the following
- # disclaimer in the documentation and/or other materials provided
- # with the distribution.
- # * Neither the name of the author nor the names of its contributors
- # may be used to endorse or promote products derived from this
- # software without specific prior written permission.
- #
- # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- # HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- _app_cache = {}
- class InstanceCache(object):
- def clear(self):
- global _app_cache
- for key, value in _app_cache.iteritems():
- expiry = value[1]
- if expiry and time() > expiry:
- del _app_cache[key]
- def flush_all(self):
- global _app_cache
- _app_cache = {}
- def set(self, key, value, seconds):
- global _app_cache
- if seconds < 0:
- seconds = 0
- _app_cache[key] = (value, time() + seconds if seconds else 0)
- def get(self, key):
- global _app_cache
- value = _app_cache.get(key, None)
- if value:
- expiry = value[1]
- if expiry and time() > expiry:
- del _app_cache[key]
- return None
- else:
- return value[0]
- return None
- def delete(self, key):
- global _app_cache
- if key in _app_cache:
- del _app_cache[key]
- return None
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