java获取唯一时间戳Id.多线程保证唯一性

工程里有获取唯一时间戳作为id的需求,想了想用乐观锁cas实现,自旋.
cas原子性操作获得了绝对唯一的时间戳(系统时间:纳秒版本).单机有效,不能分布式调用.

public class AtomicTimeStamp {

private AtomicLong timeMills = new AtomicLong(0);

private static AtomicLong at = new AtomicLong(0);

public Long getNextNaos(){
    while (true){
        long currentTimeMillis = System.nanoTime();
        long currentMill = timeMills.get();
        if(currentTimeMillis > currentMill && timeMills.compareAndSet(currentMill, currentTimeMillis)){
            return currentTimeMillis;
            //返回唯一时间戳
        }
    }
}

public static void main(String[] args) {
    AtomicTimeStamp stamp = new AtomicTimeStamp();
    ThreadPoolExecutor poolExecutor = new ThreadPoolExecutor(100, 150, 200, TimeUnit.MILLISECONDS, new PriorityBlockingQueue<>(100),new ThreadFactoryBuilder().build());
    long l = System.currentTimeMillis();
    //开启三个线程测试成功性,at自增,测试10S会有多少个成功的
    poolExecutor.execute(()->{
        while (true){
            stamp.getNextNaos();
            at.getAndIncrement();
            long l1 = System.currentTimeMillis();
            if(l1 > l + 10000 & l1{
        while (true){
            stamp.getNextNaos();
            at.getAndIncrement();
            long l1 = System.currentTimeMillis();
            if (l1 > l + 10000 & l1 < l + 10010) {
                System.out.println(at.longValue());
            }
        }
    });
    poolExecutor.execute(()->{
        while (true){
            stamp.getNextNaos();
            at.getAndIncrement();
            long l1 = System.currentTimeMillis();
            if (l1 > l + 10000 & l1 < l + 10010) {
                System.out.println(at.longValue());
            }
        }
    });
}
}

后面是新的要求,按照yyyyMMddHHmmssSSS… 的格式获取唯一

private static AtomicLong atomicTimeMills = new AtomicLong(0);

private static DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");

public static String getNextTime() {
    while (true) {
        long currentMill = atomicTimeMills.get();
        Long currentTimeMillis = Long.parseLong(LocalDateTime.now().format(formatter) + System.nanoTime()%100);
        if (currentTimeMillis > currentMill && atomicTimeMills.compareAndSet(currentMill, currentTimeMillis)) {
            return currentTimeMillis.toString();
        }
    }
}