LRU Cache

This is a simple Least Recently Used (LRU) Cache with expiration time that use redis to store the data.

Installation

Usage

Import LRUCache from the lru_redis_cache module, when creating an instance of this class you could pass:

• cache_size: Max size of the cache, the default value is 10
• ttl: Max time to expire the cache, the default value is 60 seconds
• redis_host: Host where the redis instance is allocated, default is localhost
• redis_port: Redis port, default is 6379

This class has three public methods to manage the cache:

• set(name, value) this function set a new cache value or replace the previous.

• get(name) this function return the cache element if it is stores, otherwise it will return a None value.

• set_connection(RedisConnection) this function allows you to set the redis instance to be used.

from lru_redis_cache import LRUCache

cache = LRUCache(cache_size=5, ttl=60)

cache.set("my_key", "my_value")
cache.get("my_key")

# Output
"my_value"

Tests

In order to run the test cases you need to install the basic requirements from requirements.txt by running the following command.

pip install -r requirements.txt

Then, you need to run

python -m pytest

Information

LRU Cache Implementation