freqache

A weighted, thread-safe, futures-aware Rust LFU cache which supports a custom eviction policy.

Example: ```rust use freqache::LFUCache;

[derive(Clone)]

struct Entry;

impl freqache::Entry for Entry { fn weight(&self) -> u64 { 1 } }

struct Policy;

[async_trait]

impl freqache::Policy for Policy { fn can_evict(&self, value: &Entry) -> bool { true }

async fn evict(&self, key: String, value: &Entry) {
    // maybe backup the entry contents here
}

}

let mut cache = LFUCache::new(1, Policy); cache.insert("key".to_string(), Entry);

if cache.is_full() { cache.evict().await; } ```