mirror of
https://github.com/Hopiu/django-imagekit.git
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ba9bf1f877
This new feature gives the user more control over *when* their images are validated. Image cache backends are now exclusively for controlling the *how*. This means you won't have to write a lot of code when you just want to change one or the other.
57 lines
1.4 KiB
Python
57 lines
1.4 KiB
Python
from .actions import validate_now, clear_now
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from ..utils import get_singleton
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class Pessimistic(object):
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"""
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A caching strategy that validates the file every time it's accessed.
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"""
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def on_access(self, file):
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validate_now(file)
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def on_source_delete(self, file):
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clear_now(file)
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def on_source_change(self, file):
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validate_now(file)
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class Optimistic(object):
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"""
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A caching strategy that validates when the source file changes and assumes
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that the cached file will persist.
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"""
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def on_source_create(self, file):
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validate_now(file)
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def on_source_delete(self, file):
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clear_now(file)
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def on_source_change(self, file):
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validate_now(file)
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class DictStrategy(object):
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def __init__(self, callbacks):
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for k, v in callbacks.items():
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setattr(self, k, v)
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class StrategyWrapper(object):
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def __init__(self, strategy):
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if isinstance(strategy, basestring):
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strategy = get_singleton(strategy, 'image cache strategy')
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elif isinstance(strategy, dict):
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strategy = DictStrategy(strategy)
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elif callable(strategy):
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strategy = strategy()
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self._wrapped = strategy
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def invoke_callback(self, name, *args, **kwargs):
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func = getattr(self._wrapped, 'on_%s' % name, None)
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if func:
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func(*args, **kwargs)
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