public Ticket lock(String resourceName, long duration, long wait) {
long maxWait = System.currentTimeMillis() + wait;
while (System.currentTimeMillis() < maxWait) {
Ticket t = null;
synchronized (this) {
t = (Ticket) locks.get(resourceName);
if (t == null) {
t = new SimpleTicket(resourceName, duration);
locks.put(resourceName, t);
return t;
} else if (t.isExpired()) {
t.cancel();
continue;
}
}
synchronized (t) {
try {
t.wait(Math.min(1000, wait));
} catch (InterruptedException e) {
}
}
}
return null;
}
