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"""
The cache object API for implementing caches. The default is a thread
safe in-memory dictionary.
"""
from threading import Lock
class BaseCache(object):
    def get(self, key):
        raise NotImplemented()
    def set(self, key, value):
        raise NotImplemented()
    def delete(self, key):
        raise NotImplemented()
    def close(self):
        pass
class DictCache(BaseCache):
    def __init__(self, init_dict=None):
        self.lock = Lock()
        self.data = init_dict or {}
    def get(self, key):
        return self.data.get(key, None)
    def set(self, key, value):
        with self.lock:
            self.data.update({key: value})
    def delete(self, key):
        with self.lock:
            if key in self.data:
                self.data.pop(key)