How do I implement FIFO caching in my application?

How do I implement FIFO caching in my application?

To implement FIFO caching, you need to maintain a queue that tracks the order of item insertion. When the cache reaches its limit, remove the oldest item.

What data structure should I use for the queue?

A simple way is to use a linked list or a deque (double-ended queue) which allows efficient addition and removal of items.

Can you provide a code example?

Sure! Here's a basic Python example using a deque:

from collections import deque

class FIFOCache:
    def __init__(self, capacity):
        self.cache = {}  # Store cached items
        self.queue = deque()  # Track order of items
        self.capacity = capacity

    def get(self, key):
        return self.cache.get(key, None)

    def put(self, key, value):
        if key not in self.cache:
            if len(self.cache) >= self.capacity:
                oldest = self.queue.popleft()  # Remove oldest item
                del self.cache[oldest]
            self.cache[key] = value
            self.queue.append(key)  # Add new item

What are the advantages of using FIFO caching?

FIFO caching is simple to implement and understand. It ensures that the oldest data is removed first, which can be effective for certain access patterns.