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57 lines
1.6 KiB
Python
57 lines
1.6 KiB
Python
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"""
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This implements a database storage cache for storing global
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cache data persistently.
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It is intended to be used with an event timer for updating
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semi-regularly (otherwise, object attributes are better to use
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if full persistency is needed).
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"""
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from django.db import models
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from django.conf import settings
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from src.cache.managers.cache import CacheManager
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# 091120 - there is a bug in cPickle for importing the
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# custom cache objects; only normal pickle works. /Griatch
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import pickle
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#try:
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# import cPickle as pickle
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#except ImportError:
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# import pickle
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class PersistentCache(models.Model):
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"""
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Implements a simple pickled database object, without
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using the in-game object attribute model.
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"""
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cache_name = models.CharField(max_length=255)
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cache_data = models.TextField(blank=True)
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objects = CacheManager()
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class Meta:
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permissions = settings.PERM_CACHE
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def load_cache(self):
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"""
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Recovers cache from database storage.
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"""
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cache_data = str(self.cache_data)
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#print "loading cache: %s" % cache_data
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if cache_data:
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cache_data = pickle.loads(cache_data)
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cache_data.pickle_no()
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return cache_data
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else:
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return None
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def save_cache(self, cache_obj):
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"""
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Stores a cache as a pickle.
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"""
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#print "saving ... '%s': %s" % (cache_obj,cache_obj.show())
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cache_obj.pickle_yes()
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self.cache_data = pickle.dumps(cache_obj)
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cache_obj.pickle_no()
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self.save()
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