生鲜平台超市源码

仿叮咚买菜，每日优鲜生鲜平台；
商城、会员、积分、签到、食品卡、拉新、分销加盟，运营中心，食谱、骑手、配送；
完善的功能，开箱即用，支持二次开发，

体验：https://gitee.com/mier520/fresh-supermarket

APP下载地址： https://plutusdog-apkpackage.oss-cn-beijing.aliyuncs.com/everyoneVentrueService1/4c79c90b04de41e0a98676a85cc5963d/application/vnd.android.package-archive/1646899212255.apk

import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.BiConsumer;

public class SyncDataBuffer {
    private Map> buffer;

    private Lock lock;

    private SyncDataBuffer(){
        this.buffer = new ConcurrentHashMap<>(16);
        this.lock = new ReentrantLock();
    }
    
    public String randomDomain(){
        String domain;
        while(buffer.containsKey((domain = UUID.randomUUID().toString()))){}
        return domain;
    }

    private static class Singleton {
        private static SyncDataBuffer instance = new SyncDataBuffer();
    }

}