<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def invalidate(self, *raw_args, **raw_kwargs):
 """ Mark a cached item invalid and trigger an asynchronous job to refresh the cache """

        args = self.prepare_args(*raw_args)
        kwargs = self.prepare_kwargs(**raw_kwargs)
        key = self.key(*args, **kwargs)
        item = self.cache.get(key)
        if item is not None:
            expiry, data = item
            self.store(key, self.timeout(*args, **kwargs), data)
            self.async_refresh(*args, **kwargs)