mirror of
https://github.com/evilhero/mylar
synced 2024-12-23 00:02:38 +00:00
124 lines
4.4 KiB
Python
124 lines
4.4 KiB
Python
|
# mako/cache.py
|
||
|
# Copyright (C) 2006-2011 the Mako authors and contributors <see AUTHORS file>
|
||
|
#
|
||
|
# This module is part of Mako and is released under
|
||
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
||
|
|
||
|
from mako import exceptions
|
||
|
|
||
|
cache = None
|
||
|
|
||
|
class BeakerMissing(object):
|
||
|
def get_cache(self, name, **kwargs):
|
||
|
raise exceptions.RuntimeException("the Beaker package is required to use cache functionality.")
|
||
|
|
||
|
class Cache(object):
|
||
|
"""Represents a data content cache made available to the module
|
||
|
space of a :class:`.Template` object.
|
||
|
|
||
|
:class:`.Cache` is a wrapper on top of a Beaker CacheManager object.
|
||
|
This object in turn references any number of "containers", each of
|
||
|
which defines its own backend (i.e. file, memory, memcached, etc.)
|
||
|
independently of the rest.
|
||
|
|
||
|
"""
|
||
|
|
||
|
def __init__(self, id, starttime):
|
||
|
self.id = id
|
||
|
self.starttime = starttime
|
||
|
self.def_regions = {}
|
||
|
|
||
|
def put(self, key, value, **kwargs):
|
||
|
"""Place a value in the cache.
|
||
|
|
||
|
:param key: the value's key.
|
||
|
:param value: the value
|
||
|
:param \**kwargs: cache configuration arguments. The
|
||
|
backend is configured using these arguments upon first request.
|
||
|
Subsequent requests that use the same series of configuration
|
||
|
values will use that same backend.
|
||
|
|
||
|
"""
|
||
|
|
||
|
defname = kwargs.pop('defname', None)
|
||
|
expiretime = kwargs.pop('expiretime', None)
|
||
|
createfunc = kwargs.pop('createfunc', None)
|
||
|
|
||
|
self._get_cache(defname, **kwargs).put_value(key, starttime=self.starttime, expiretime=expiretime)
|
||
|
|
||
|
def get(self, key, **kwargs):
|
||
|
"""Retrieve a value from the cache.
|
||
|
|
||
|
:param key: the value's key.
|
||
|
:param \**kwargs: cache configuration arguments. The
|
||
|
backend is configured using these arguments upon first request.
|
||
|
Subsequent requests that use the same series of configuration
|
||
|
values will use that same backend.
|
||
|
|
||
|
"""
|
||
|
|
||
|
defname = kwargs.pop('defname', None)
|
||
|
expiretime = kwargs.pop('expiretime', None)
|
||
|
createfunc = kwargs.pop('createfunc', None)
|
||
|
|
||
|
return self._get_cache(defname, **kwargs).get_value(key, starttime=self.starttime, expiretime=expiretime, createfunc=createfunc)
|
||
|
|
||
|
def invalidate(self, key, **kwargs):
|
||
|
"""Invalidate a value in the cache.
|
||
|
|
||
|
:param key: the value's key.
|
||
|
:param \**kwargs: cache configuration arguments. The
|
||
|
backend is configured using these arguments upon first request.
|
||
|
Subsequent requests that use the same series of configuration
|
||
|
values will use that same backend.
|
||
|
|
||
|
"""
|
||
|
defname = kwargs.pop('defname', None)
|
||
|
expiretime = kwargs.pop('expiretime', None)
|
||
|
createfunc = kwargs.pop('createfunc', None)
|
||
|
|
||
|
self._get_cache(defname, **kwargs).remove_value(key, starttime=self.starttime, expiretime=expiretime)
|
||
|
|
||
|
def invalidate_body(self):
|
||
|
"""Invalidate the cached content of the "body" method for this template.
|
||
|
|
||
|
"""
|
||
|
self.invalidate('render_body', defname='render_body')
|
||
|
|
||
|
def invalidate_def(self, name):
|
||
|
"""Invalidate the cached content of a particular <%def> within this template."""
|
||
|
|
||
|
self.invalidate('render_%s' % name, defname='render_%s' % name)
|
||
|
|
||
|
def invalidate_closure(self, name):
|
||
|
"""Invalidate a nested <%def> within this template.
|
||
|
|
||
|
Caching of nested defs is a blunt tool as there is no
|
||
|
management of scope - nested defs that use cache tags
|
||
|
need to have names unique of all other nested defs in the
|
||
|
template, else their content will be overwritten by
|
||
|
each other.
|
||
|
|
||
|
"""
|
||
|
|
||
|
self.invalidate(name, defname=name)
|
||
|
|
||
|
def _get_cache(self, defname, type=None, **kw):
|
||
|
global cache
|
||
|
if not cache:
|
||
|
try:
|
||
|
from beaker import cache as beaker_cache
|
||
|
cache = beaker_cache.CacheManager()
|
||
|
except ImportError:
|
||
|
# keep a fake cache around so subsequent
|
||
|
# calls don't attempt to re-import
|
||
|
cache = BeakerMissing()
|
||
|
|
||
|
if type == 'memcached':
|
||
|
type = 'ext:memcached'
|
||
|
if not type:
|
||
|
(type, kw) = self.def_regions.get(defname, ('memory', {}))
|
||
|
else:
|
||
|
self.def_regions[defname] = (type, kw)
|
||
|
return cache.get_cache(self.id, type=type, **kw)
|
||
|
|