cache_group.py

class CacheGroup(object):
    ttl = 3600
    initial = 1
    group = ''

    def __init__(self, group, ttl):
        self.group = group
        self.ttl = ttl

    def key(self, key):
        postfix = cache.get(self.group)
        if not postfix:
            cache.set(self.group, self.initial)
            postfix = self.initial
        return key + str(postfix)

    def set(self, key, value):
        cache.set(self.key(key), value, self.ttl)

    def get(self, key):
        return cache.get(self.key(key), None)

    @classmethod
    def _invalidate(cls, group):
        number = cache.get(group)
        if number:
            cache.set(group, int(number) + 1)

    @classmethod
    def invalidate(cls, group=None):
        cls._invalidate(group)

    def invalidate2(self):
        self._invalidate(self.group)