这是基于 Tokio 的异步 API。连接到一台服务器后获取 key，并立即释放。
use std::time::Duration;
use ticketing::TicketBroker;
let broker = TicketBroker::connect(["127.0.0.1:5225"]);
broker.wait_ready(Duration::from_secs(5)).await;
let wait = Duration::from_secs(5);
let lease = Duration::from_secs(30);
let ticket = broker.acquire("key", wait, lease).await.unwrap();
ticket.release().await.unwrap();
println!("pass");这是一个验证示例：多个任务通过账户级锁互斥地反复存取款，确认余额最终总能回到初始值。 TicketBroker 可以 Clone，因此可以在多个任务间共享。
async fn transaction(broker: &TicketBroker, account: usize, delta: i64) {
let key = format!("account-{account}");
let _ticket = match broker.acquire(&key, WAIT, LEASE).await {
Ok(ticket) => Some(ticket),
Err(e) => {
tracing::error!("account {account} acquire failed: {e}");
return;
}
};
// 仅在持有锁期间的临界区是安全的
let before = balances[account];
tokio::task::yield_now().await;
balances[account] = before + delta;
// drop ticket 时会在后台自动释放（若无需立即释放则可省略）
let (action, sign) = if delta < 0 { ("withdraw", '-') } else { ("deposit", '+') };
tracing::info!("account {account} {action} {sign}${AMOUNT} -> ${}", balances[account]);
}完整示例请参阅 tests/example_simple.rs、 tests/example_bank.rs、 tests/bench_test.rs。