feat: add mutex_cache.rs

src/bin/mutex_cache.rs

@@ -0,0 +1,29 @@
+use tokio::sync::Mutex;
+
+struct Cache<T>(Mutex<Vec<T>>);
+
+impl<T> Cache<T> {
+    async fn get(&self, index: usize) -> Option<T>
+    where
+        T: Clone,
+    {
+        self.0.lock().await.get(index).cloned()
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let cache = Cache(Mutex::new(vec![
+        "Rust ".to_string(),
+        "is ".to_string(),
+        "awesome!".to_string(),
+    ]));
+
+    for i in 0..3 {
+        if let Some(item) = cache.get(i).await {
+            print!("{}", item);
+        }
+    }
+}
+
+// Rust is awesome!