このライブラリは、JVM1つにJavaとKotlinの2つのAPIをまとめて収めています。TicketBrokerはKotlinの コルーチンベースのAPIで、BlockingTicketBrokerはコルーチンなしで使えるJavaフレンドリーなブロッキングファサード （java.time.Durationベース）です。内部的には同じブローカーをラップしています。
val broker = TicketBroker.connect("127.0.0.1:5225")
broker.waitReady(5.seconds)
val ticket = broker.acquire("key", 5.seconds, 30.seconds)
ticket.release()
broker.close()同時実行の例（口座ごとのロックで入出金を相互排他）:
suspend fun transaction(broker: TicketBroker, account: Int, delta: Long) {
val key = "account-$account"
val ticket = try {
broker.acquire(key, wait, lease)
} catch (e: Exception) {
log.error("account {} acquire failed: {}", account, e.message)
return
}
try {
val before = balances[account]
yield()
balances[account] = before + delta
} finally {
ticket.close() // バックグラウンド自動返却
}
val (action, sign) = if (delta < 0) "withdraw" to '-' else "deposit" to '+'
log.info("account $account $action $sign\$$AMOUNT -> \$${balances[account]}")
}try (BlockingTicketBroker broker = BlockingTicketBroker.connect(List.of("127.0.0.1:5225"))) {
broker.waitReady(Duration.ofSeconds(5));
BlockingTicket ticket = broker.acquire("key", Duration.ofSeconds(5), Duration.ofSeconds(30));
ticket.release();
System.out.println("pass");
}同時実行の例（口座ごとのロック、ExecutorServiceで複数スレットから同時実行）:
void transaction(BlockingTicketBroker broker, int account, long delta) {
String key = "account-" + account;
try (BlockingTicket ticket = broker.acquire(key, WAIT, LEASE)) {
long before = balances[account];
Thread.yield();
balances[account] = before + delta;
}
String action = delta < 0 ? "withdraw" : "deposit";
char sign = delta < 0 ? '-' : '+';
log.info("account {} {} {}${} -> ${}", account, action, sign, AMOUNT, balances[account]);
}全体の例は ExampleSimpleTest.kt / ExampleBankTest.kt（Kotlin）, ExampleSimpleJavaTest.java / ExampleBankJavaTest.java（Java）で確認してください。