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Caching tag with singnal-based invalidation

Author:
rushman
Posted:
March 6, 2008
Language:
Python
Version:
.96
Tags:
cache decorator invalidation
Score:
4 (after 4 ratings)

Example usage: @cached('/data/something_hard') def get_something_complex(): .... return result

dispatcher.connect(get_something_complex.invalidate, django.db.models.signals.post_save, Model)

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def cached(slot_name, timeout=None):
    def decorator(function):
        def invalidate():
            cache.delete(slot_name)

        def wrapped(*args, **kwargs):
            result = cache.get(slot_name)
            if result is None:
                result = function(*args, **kwargs)
                cache.set(slot_name, result, timeout)
            return result
        wrapped.invalidate = invalidate
        return wrapped
    return decorator

# Here is example usage:

@cached('/data/something_hard')
def get_something_complex():
    ....
    return result

dispatcher.connect(get_something_complex.invalidate, django.db.models.signals.post_save, Model) 

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