Method getLock

java/Chapter 16/Question16_4/LockFactory.java:91–103

(int ownerId, int resourceID)

	/* Get the lock, verifying first that the process is really calling the locks in the order
	 * it said it would. */
	public Lock getLock(int ownerId, int resourceID) {
		LinkedList<LockNode> list = lockOrder.get(ownerId);
		if (list == null) {
			return null;
		}
		
		LockNode head = list.getFirst();
		if (head.getId() == resourceID) {
			list.removeFirst();
			return head.getLock();
		}
		return null;
	}
}