com.anwen.mongo.incrementer.id.AutoIdGenerate Maven / Gradle / Ivy
package com.anwen.mongo.incrementer.id;
import java.util.concurrent.atomic.AtomicInteger;
/**
* 自增id生成
* @author JiaChaoYang
* @date 2023-11-24 09:19
**/
public class AutoIdGenerate {
private final AtomicInteger counter;
private volatile static AutoIdGenerate instance;
/**
* 双重检查锁定，保证线程安全，基于懒汉
* @author JiaChaoYang
* @date 2023/11/24 10:36
*/
public static AutoIdGenerate getInstance() {
if (instance == null) {
synchronized (AutoIdGenerate.class) {
if (instance == null) {
instance = new AutoIdGenerate();
}
}
}
return instance;
}
/**
* 默认从0开始
* @author JiaChaoYang
* @date 2023/11/24 9:22
*/
private AutoIdGenerate(){
counter = new AtomicInteger(0);
}
/**
* 获取下一个id
* @author JiaChaoYang
* @date 2023/11/24 9:21
*/
public synchronized int getNextId() {
return counter.incrementAndGet();
}
public synchronized void addAndGet(int delta){
counter.addAndGet(delta);
}
}