Team Exercise Oct 31, 2024

What is this?

The Searchcraft engineering team often does small coding exercises together to compare solutions that we may come up with for a problem. These exercises are scoped to be completed in an hour or less.

Exercise Parameters

• Create an in-memory cache in Rust that stores key-value pairs and automatically evicts entries after a given expiration time. The cache should allow insertion, retrieval, and manual invalidation of entries.
• Methods: insert, get, invalidate
• get method should automatically invalidate expired entries before retrieval

let mut cache = Cache::new();
cache.insert("user_xyz", "session_value", Duration::new(30, 0)); // TTL 30 seconds

if let Some(token) = cache.get("user_xyz") {
    println!("Token: {}", token);
} else {
    println!("Token expired or not found");
}

cache.invalidate("user_xyz");

How to run this project

cargo run -- insert -k mykey -v myvalue -t 60
cargo run -- get -k mykey
cargo run -- invalidate -k mykey