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redis based cache_clear() for lru_cache

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lru_cache_pubsub_cache_clear is a decorator to broadcast cache_clear() calls to lru_cache across multiple instances of an application. This allows for local cache access speed and redis-like centralized cache invalidation. Example:

from lru_cache_pubsub_cache_clear.decorators import lru_cache_pubsub_cache_clear
from django_redis import get_redis_connection

def get_data(key)
    return value

Here get_redis_connection is a callable which returns a redis connection (e.g. django_redis.get_redis_connection).

Then every time one of app instances calls get_data.cache_clear() it will be executed on all connected instances.

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