如何在Rust中创建缓存对象工厂？

use lru_cache::LruCache;

struct CacheFactory {
    cache: LruCache<String, String>,
}

impl CacheFactory {
    fn new(capacity: usize) -> Self {
        CacheFactory {
            cache: LruCache::new(capacity),
        }
    }

    fn insert(&mut self, key: String, value: String) {
        self.cache.insert(key, value);
    }

    fn get(&mut self, key: &str) -> Option<&String> {
        self.cache.get(key)
    }
}

fn main() {
    let mut factory = CacheFactory::new(100);

    factory.insert("key1".to_string(), "value1".to_string());
    factory.insert("key2".to_string(), "value2".to_string());

    if let Some(value) = factory.get("key1") {
        println!("Value: {}", value);
    }
}