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@@ -1,151 +0,0 @@
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-package com.gyee.table.utils;
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-
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-import org.springframework.stereotype.Component;
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-
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-import java.lang.management.ManagementFactory;
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-import java.net.InetAddress;
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-import java.net.NetworkInterface;
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-
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-//雪花算法代码实现
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-@Component
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-public class IdWorker {
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- // 时间起始标记点,作为基准,一般取系统的最近时间(一旦确定不能变动)
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- private final static long twepoch = 1673490532716L;
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- // 机器标识位数
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- private final static long workerIdBits = 5L;
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- // 数据中心标识位数
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- private final static long datacenterIdBits = 5L;
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- // 机器ID最大值
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- private final static long maxWorkerId = -1L ^ (-1L << workerIdBits);
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- // 数据中心ID最大值
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- private final static long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);
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- // 毫秒内自增位
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- private final static long sequenceBits = 12L;
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- // 机器ID偏左移12位
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- private final static long workerIdShift = sequenceBits;
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- // 数据中心ID左移17位
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- private final static long datacenterIdShift = sequenceBits + workerIdBits;
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- // 时间毫秒左移22位
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- private final static long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;
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-
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- private final static long sequenceMask = -1L ^ (-1L << sequenceBits);
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- /* 上次生产id时间戳 */
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- private static long lastTimestamp = -1L;
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- // 0,并发控制
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- private long sequence = 0L;
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-
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- private final long workerId;
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- // 数据标识id部分
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- private final long datacenterId;
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-
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- public IdWorker(){
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- this.datacenterId = getDatacenterId(maxDatacenterId);
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- this.workerId = getMaxWorkerId(datacenterId, maxWorkerId);
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- }
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- /**
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- * @param workerId
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- * 工作机器ID
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- * @param datacenterId
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- * 序列号
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- */
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- public IdWorker(long workerId, long datacenterId) {
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- if (workerId > maxWorkerId || workerId < 0) {
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- throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxWorkerId));
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- }
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- if (datacenterId > maxDatacenterId || datacenterId < 0) {
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- throw new IllegalArgumentException(String.format("datacenter Id can't be greater than %d or less than 0", maxDatacenterId));
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- }
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- this.workerId = workerId;
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- this.datacenterId = datacenterId;
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- }
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- /**
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- * 获取下一个ID
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- *
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- * @return
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- */
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- public synchronized long nextId() {
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- long timestamp = timeGen();
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- if (timestamp < lastTimestamp) {
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- throw new RuntimeException(String.format("Clock moved backwards. Refusing to generate id for %d milliseconds", lastTimestamp - timestamp));
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- }
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-
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- if (lastTimestamp == timestamp) {
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- // 当前毫秒内,则+1
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- sequence = (sequence + 1) & sequenceMask;
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- if (sequence == 0) {
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- // 当前毫秒内计数满了,则等待下一秒
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- timestamp = tilNextMillis(lastTimestamp);
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- }
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- } else {
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- sequence = 0L;
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- }
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- lastTimestamp = timestamp;
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- // ID偏移组合生成最终的ID,并返回ID
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- long nextId = ((timestamp - twepoch) << timestampLeftShift)
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- | (datacenterId << datacenterIdShift)
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- | (workerId << workerIdShift) | sequence;
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-
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- return nextId;
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- }
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-
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- public String nextIdStr(){
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- return String.valueOf(this.nextId());
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- }
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-
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- private long tilNextMillis(final long lastTimestamp) {
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- long timestamp = this.timeGen();
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- while (timestamp <= lastTimestamp) {
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- timestamp = this.timeGen();
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- }
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- return timestamp;
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- }
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-
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- private long timeGen() {
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- return System.currentTimeMillis();
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- }
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-
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- /**
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- * <p>
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- * 获取 maxWorkerId
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- * </p>
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- */
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- protected static long getMaxWorkerId(long datacenterId, long maxWorkerId) {
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- StringBuffer mpid = new StringBuffer();
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- mpid.append(datacenterId);
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- String name = ManagementFactory.getRuntimeMXBean().getName();
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- if (!name.isEmpty()) {
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- /*
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- * GET jvmPid
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- */
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- mpid.append(name.split("@")[0]);
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- }
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- /*
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- * MAC + PID 的 hashcode 获取16个低位
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- */
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- return (mpid.toString().hashCode() & 0xffff) % (maxWorkerId + 1);
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- }
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-
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- /**
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- * <p>
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- * 数据标识id部分
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- * </p>
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- */
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- protected static long getDatacenterId(long maxDatacenterId) {
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- long id = 0L;
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- try {
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- InetAddress ip = InetAddress.getLocalHost();
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- NetworkInterface network = NetworkInterface.getByInetAddress(ip);
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- if (network == null) {
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- id = 1L;
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- } else {
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- byte[] mac = network.getHardwareAddress();
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- id = ((0x000000FF & (long) mac[mac.length - 1])
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- | (0x0000FF00 & (((long) mac[mac.length - 2]) << 8))) >> 6;
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- id = id % (maxDatacenterId + 1);
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- }
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- } catch (Exception e) {
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- System.out.println(" getDatacenterId: " + e.getMessage());
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- }
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- return id;
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- }
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-}
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