Cache Warming with Python: Preload Hot Keys

import time
from collections import OrderedDict

class CacheWarm:
    def __init__(self, capacity=3):
        self.capacity = capacity
        self.cache = OrderedDict()
        self.hot_keys = []

    def warm(self, keys):
        """Preload hot keys into cache with mock values."""
        for key in keys:
            if len(self.cache) >= self.capacity:
                self.cache.popitem(last=False)
            self.cache[key] = f"mock_value_{key}"
            self.hot_keys.append(key)

    def get(self, key):
        if key in self.cache:
            self.cache.move_to_end(key)
            return self.cache[key]
        return None

    def display(self):
        return list(self.cache.items())

if __name__ == "__main__":
    cache = CacheWarm(capacity=3)
    cache.warm(["user_101", "product_42", "user_101", "product_99"])
    print("Cache state after warming:", cache.display())
    print("Get user_101:", cache.get("user_101"))
    print("Get missing key:", cache.get("nonexistent"))
    print("Hot keys tracked:", cache.hot_keys)