mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-03-17 05:40:25 +00:00
397a79ba56
As discussed in #214, source_created and source_changed didn't really have clear definitions. In truth, their names and separation betray their origins as model receivers in earlier versions. The "source group" abstraction helped us get away from thinking about things exclusively in terms of models, but these remained as an artifact.
56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
from django.utils.functional import LazyObject
|
|
from ..utils import get_singleton
|
|
|
|
|
|
class JustInTime(object):
|
|
"""
|
|
A strategy that ensures the file exists right before it's needed.
|
|
|
|
"""
|
|
|
|
def on_existence_required(self, file):
|
|
file.generate()
|
|
|
|
def on_content_required(self, file):
|
|
file.generate()
|
|
|
|
|
|
class Optimistic(object):
|
|
"""
|
|
A strategy that acts immediately when the source file changes and assumes
|
|
that the cache files will not be removed (i.e. it doesn't ensure the
|
|
cache file exists when it's accessed).
|
|
|
|
"""
|
|
|
|
def on_source_saved(self, file):
|
|
file.generate()
|
|
|
|
|
|
class DictStrategy(object):
|
|
def __init__(self, callbacks):
|
|
for k, v in callbacks.items():
|
|
setattr(self, k, v)
|
|
|
|
|
|
class StrategyWrapper(LazyObject):
|
|
def __init__(self, strategy):
|
|
if isinstance(strategy, basestring):
|
|
strategy = get_singleton(strategy, 'cache file strategy')
|
|
elif isinstance(strategy, dict):
|
|
strategy = DictStrategy(strategy)
|
|
elif callable(strategy):
|
|
strategy = strategy()
|
|
self._wrapped = strategy
|
|
|
|
def __getstate__(self):
|
|
return {'_wrapped': self._wrapped}
|
|
|
|
def __setstate__(self, state):
|
|
self._wrapped = state['_wrapped']
|
|
|
|
def __unicode__(self):
|
|
return unicode(self._wrapped)
|
|
|
|
def __str__(self):
|
|
return str(self._wrapped)
|