Hello, Rehan.
I hope you doing well.

Least Recently Used (LRU) cache in implementation of this, if the cache memory gets full, then some of the least recently used data will be removed from the cache memory in order to make room for new data.

To check out LRU cache implementation in Odoo, you can go through the lru.py file located in the /odoo/tools directory.

Link : https://github.com/feigames/Odoo/blob/master/openerp/tools/lru.py

Hope this answer helps you.

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari