33 lines
826 B
Python
33 lines
826 B
Python
# encoding: utf-8
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def simple_dict2str(d):
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# Simple dict serializer
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return ";".join(["%s=%s" % (k, v) for (k, v) in d.items()])
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_serializer = simple_dict2str
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class ObjectFactory:
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"""
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Get object from cache or create new object.
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"""
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def __init__(self, cls):
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self.cls = cls
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self.pool = {}
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def __getitem__(self, k):
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if not isinstance(k, dict):
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raise ValueError("item must be dict, not %s" % type(k))
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cache_key = _serializer(k)
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obj = self.pool.get(cache_key, None)
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if obj is None:
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obj = self.cls(**k)
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self.pool[cache_key] = obj
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return obj
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def invalidate(self, k):
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cache_key = _serializer(k)
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if cache_key in self.pool:
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del self.pool[cache_key]
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return self[cache_key] |