示例代码

AtomicLong 实现的计数器，Java 8 LongAdder更高效！ 详情

@Service public class EnterpriseNameSuffixService implements InitializingBean {

@Autowired
private EnterpriseNameSuffixRepository enterpriseNameSuffixRepository;
private AtomicLong atomicLong = new AtomicLong();
private static int SUFFIX_SPAN_SIZE = 50;
@Override
public void afterPropertiesSet() throws Exception {
    //获取当前记录计数
    long currentSuffix = getCurrentSuffix();
    //添加到当前计数器
    atomicLong.set(currentSuffix);
    //重启服务后，更新后缀，防止服务在 SUFFIX_SPAN_SIZE 内被重启
    updateEnterpriseNameSuffix(currentSuffix + SUFFIX_SPAN_SIZE);
}
//获取下一个计数后缀
public String getNextSuffix() {
    long counterSuffix = atomicLong.getAndIncrement();
    if (counterSuffix % 50 == 0) {
       updateEnterpriseNameSuffix(counterSuffix + SUFFIX_SPAN_SIZE);
    }
    NumberFormat numberFormat = new DecimalFormat("000000");
    return numberFormat.format(atomicLong.get());
}
//从数据库中获取当前记录计数
private long getCurrentSuffix() {
    Sort sort = new Sort("create_time", "desc");
    List<EnterpriseNameSuffix> enterpriseNameSuffixs = enterpriseNameSuffixRepository.findAll(sort);
    for (EnterpriseNameSuffix enterpriseNameSuffix : enterpriseNameSuffixs) {
        return enterpriseNameSuffix.getSuffix();
    }
    return 0;
}
private void updateEnterprise 大专栏  Java 基于 AtomicLong 高并发计数器NameSuffix(long suffix) {
    EnterpriseNameSuffix enterpriseNameSuffix = new EnterpriseNameSuffix();
    Sort sort = new Sort("create_time", "desc");
    List<EnterpriseNameSuffix> enterpriseNameSuffixs = enterpriseNameSuffixRepository.findAll(sort);
    for (EnterpriseNameSuffix tEnterpriseNameSuffix : enterpriseNameSuffixs) {
        enterpriseNameSuffix = tEnterpriseNameSuffix;
        break;
    }
    enterpriseNameSuffix.setSuffix(suffix);
    enterpriseNameSuffix.setCreateTime(System.currentTimeMillis());
    enterpriseNameSuffixRepository.save(enterpriseNameSuffix);
} }

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