/**
 * Generates sequential unique IDs starting with 1, 2, 3, and so on.
 * <p>
 * This class is not thread-safe unless you add "synchronized" to the method.
 * </p>
 */
class BrokenUniqueIdGenerator {
	private long counter = 0;

	public  long nextId() {
		long c = counter;
		c++;
		Thread.yield();
		counter = c;
		return c;	
	}
}