package cn.study.concurrency.ch11; /** * 锁分段 * @author xiaof * */ public class StripedMap { //同步策略:就是对数组进行分段上锁,n个节点用n%LOCKS锁保护 private static final int N_LOCKS = 16; private final Node[] buckets; private final Object[] locks; private static class Nod
今天遇到个小问题觉得挺有意思,与大家分享. 需求是这样的,对数据库中的一张表做按时间的分段统计,结果只要每个区间的数量. select YEAR(create_time) as nian,MONTH(create_time) as yue,count(customid) from custom_info GROUP BY nian,yue 结构是这样的,哈哈 /solr/comment/browse?q=*%3A*&wt=json&indent=true&start=0&
