io.github.whimthen.kits.UniqueId Maven / Gradle / Ivy
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Easy to use java tool library.
package io.github.whimthen.kits;
import java.util.concurrent.atomic.AtomicInteger;
/**
* 唯一id序列工具类
* 需要在config.properties中配置unique_seed_id为int类型的数值
*
* @project: kits
* @created: with IDEA
* @author: kits
* @Date: 2018 09 26 2:47 PM | September. Wednesday
*/
public class UniqueId {
private static final int SEQ_DEFAULT = 0;
private static final int RADIX = 62;
private static final int sequenceLeft = 12;
private static final int signIdLeft = 10;
private static final int maxsignId = 1 << signIdLeft;
private static volatile AtomicInteger orderedIdSequence = new AtomicInteger(SEQ_DEFAULT);
private static Long lastTime = 0L;
private static int workId = 0;
static {
int signId = PropertiesKit.getInt("unique_seed_id");
if(workId > maxsignId || signId < 0){
throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", maxsignId));
}
workId = signId;
}
/**
* 获取下一个 IntId
* @return 返回 userId
*/
public static long nextInt(){
return generateId();
}
/**
* 获取下一个 StringId
* @return 返回 userId
*/
public static String nextString(){
return StringKit.radixConvert(generateId(), RADIX);
}
/**
* 生成带顺序的 ID 序列
* @return ID字符串
*/
public static synchronized long generateId(){
long currentTime = System.currentTimeMillis();
if(lastTime < currentTime){
orderedIdSequence.set(SEQ_DEFAULT);
}else if(lastTime > currentTime){
throw new RuntimeException("Clock moved backwards.");
}
long resultId = (currentTime << (sequenceLeft+signIdLeft) ) | (workId << signIdLeft) | orderedIdSequence.getAndAdd(1);
lastTime = currentTime;
return resultId;
}
}