This library bundles both Java and Kotlin APIs on a single JVM. TicketBroker is the Kotlin coroutine-based API, and BlockingTicketBroker is a Java-friendly blocking facade (based on java.time.Duration) usable without coroutines. Internally, both wrap the same broker.
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()Concurrency example (deposits/withdrawals mutually excluded by a per-account lock):
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() // automatic background release
}
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");
}Concurrency example (per-account lock, run concurrently across multiple threads via ExecutorService):
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]);
}See the full examples in ExampleSimpleTest.kt / ExampleBankTest.kt (Kotlin), ExampleSimpleJavaTest.java / ExampleBankJavaTest.java (Java).