面试题：在分布式系统，你能想出来几种生成唯一ID的方案？(11)_系统唯一ID是我们在设计一个系统的时候

private static long sequenceBits = 12L;

private long workerIdShift = sequenceBits;
private long datacenterIdShift = sequenceBits + workerIdBits;
private long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;
private long sequenceMask = -1L ^ (-1L << (int)sequenceBits);

private long lastTimestamp = -1L;
private static object syncRoot = new object();

public IdWorker(long workerId long datacenterId)
{

// sanity check for workerId
if (workerId > maxWorkerId || workerId < 0)
{
throw new ArgumentException(string.Format(\"worker Id can't be greater than %d or less than 0\" maxWorkerId));