String str = String.valueOf(test1.nextId(i));
System.out.println(str);
f.write(str + "\n");
}
}
// System.out.println(test1.nextId(1666885538000l));
f.close();
}
private static final long serialVersionUID = 1L;
public static long DEFAULT_TWEPOCH = 1288834974657L;
public static long DEFAULT_TIME_OFFSET = 2000L;
private static final long WORKER_ID_BITS = 5L;
private static final long MAX_WORKER_ID = -1L ^ (-1L << WORKER_ID_BITS);
private static final long DATA_CENTER_ID_BITS = 5L;
private static final long MAX_DATA_CENTER_ID = -1L ^ (-1L << DATA_CENTER_ID_BITS);
private static final long SEQUENCE_BITS = 12L;
private static final long WORKER_ID_SHIFT = SEQUENCE_BITS;
private static final long DATA_CENTER_ID_SHIFT = SEQUENCE_BITS + WORKER_ID_BITS;
private static final long TIMESTAMP_LEFT_SHIFT = SEQUENCE_BITS + WORKER_ID_BITS + DATA_CENTER_ID_BITS;
private static final long SEQUENCE_MASK = ~(-1L << SEQUENCE_BITS);// 4095
private long twepoch;
private long workerId;
private long dataCenterId;
private boolean useSystemClock;
private long timeOffset;
private long sequence = 0L;
private long lastTimestamp = -1L;
public test() {
this(IdUtil.getWorkerId(IdUtil.getDataCenterId(MAX_DATA_CENTER_ID), MAX_WORKER_ID));
}
public test(long workerId) {
this(workerId, IdUtil.getDataCenterId(MAX_DATA_CENTER_ID));
}
public test(long workerId, long dataCenterId) {
this(workerId, dataCenterId, false);
}
public test(long workerId, long dataCenterId, boolean isUseSystemClock) {
this(null, workerId, dataCenterId, isUseSystemClock);
}
public test(Date epochDate, long workerId, long dataCenterId, boolean isUseSystemClock) {
this(epochDate, workerId, dataCenterId, isUseSystemClock, DEFAULT_TIME_OFFSET);
}
public test(Date epochDate, long workerId, long dataCenterId, boolean isUseSystemClock, long timeOffset) {
if (null != epochDate) {
this.twepoch = epochDate.getTime();
System.out.println("null != epochDate");
} else{
// Thu, 04 Nov 2010 01:42:54 GMT
this.twepoch = DEFAULT_TWEPOCH;
}
if (workerId > MAX_WORKER_ID || workerId < 0) {
throw new IllegalArgumentException(StrUtil.format("worker Id can't be greater than {} or less than 0", MAX_WORKER_ID));
}
if (dataCenterId > MAX_DATA_CENTER_ID || dataCenterId < 0) {
throw new IllegalArgumentException(StrUtil.format("datacenter Id can't be greater than {} or less than 0", MAX_DATA_CENTER_ID));
}
this.workerId = workerId;
this.dataCenterId = dataCenterId;
this.useSystemClock = isUseSystemClock;
this.timeOffset = timeOffset;
}
public long getWorkerId(long id) {
return id >> WORKER_ID_SHIFT & ~(-1L << WORKER_ID_BITS);
}
public long getDataCenterId(long id) {
return id >> DATA_CENTER_ID_SHIFT & ~(-1L << DATA_CENTER_ID_BITS);
}
public long getGenerateDateTime(long id) {
return (id >> TIMESTAMP_LEFT_SHIFT & ~(-1L << 41L)) + twepoch;
}
public synchronized long nextId(long time0) {
long timestamp = time0;
if (timestamp < this.lastTimestamp) {
if(this.lastTimestamp - timestamp < timeOffset){
// 容忍指定的回拨，避免NTP校时造成的异常
timestamp = lastTimestamp;
} else{
// 如果服务器时间有问题(时钟后退) 报错。
throw new IllegalStateException(StrUtil.format("Clock moved backwards. Refusing to generate id for {}ms", lastTimestamp - timestamp));
}
}
if (timestamp == this.lastTimestamp) {
final long sequence = (this.sequence + 1) & SEQUENCE_MASK;
if (sequence == 0) {
timestamp = tilNextMillis(lastTimestamp,time0);
}
this.sequence = sequence;
} else {
sequence = 0L;
}
lastTimestamp = timestamp;
long result = ((timestamp - twepoch) << TIMESTAMP_LEFT_SHIFT)
| (dataCenterId << DATA_CENTER_ID_SHIFT)
| (workerId << WORKER_ID_SHIFT)
| sequence;
return result;
}
public String nextIdStr() {
// return Long.toString(nextId());
return null;
}
// ------------------------------------------------------------------------------------------------------------------------------------ Private method start
private long tilNextMillis(long lastTimestamp,long time0) {
long timestamp = time0;
while (timestamp == lastTimestamp) {
timestamp = time0;
}
if (timestamp < lastTimestamp) {
// 如果发现新的时间戳比上次记录的时间戳数值小，说明操作系统时间发生了倒退，报错
throw new IllegalStateException(
StrUtil.format("Clock moved backwards. Refusing to generate id for {}ms", lastTimestamp - timestamp));
}
return timestamp;
}
private long genTime() {
return this.useSystemClock ? SystemClock.now() : System.currentTimeMillis();
}
// ------------------------------------------------------------------------------------------------------------------------------------ Private method end
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