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.
- 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 getmethod 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");cargo run -- insert -k mykey -v myvalue -t 60
cargo run -- get -k mykey
cargo run -- invalidate -k mykey