| CREATE OR REPLACE FUNCTION random_int_array(dim integer, min integer, max integer) RETURNS integer[] AS $BODY$ | |
| begin | |
| return (select array_agg(round(random() * (max - min)) + min) from generate_series (0, dim)); | |
| end | |
| $BODY$ LANGUAGE plpgsql; | |
| -- usage example | |
| select random_int_array(15, 6, 40); | |
| -- return example |
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| import java.util.HashMap; | |
| import java.util.Map; | |
| import java.util.Map.Entry; | |
| /** | |
| * 一种本地缓存的无锁实现思路 | |
| * 适用场景：预先知道的需要缓存的一批数据,比如卖家品牌授权,馆信息,达人信息 | |
| * 数据更新不太频繁,定时更新或者更新由自己手动控制 | |
| */ | |
| public abstract class AbstractLocalCache<K, V> { |