Spring RedisTemplate操作-HyperLogLog操作

最新推荐文章于 2024-07-29 17:14:44 发布

原创最新推荐文章于 2024-07-29 17:14:44 发布 · 4.2k 阅读

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CC 4.0 BY-SA版权

文章标签：

#redis #java #数据库 #存储 #RedisTemplate

本文介绍如何使用Spring Data Redis实现HyperLogLog操作，包括添加元素、获取估算唯一值数量、并集操作及删除等。通过具体代码示例展示了HyperLogLog在估算大量数据中不重复元素数量的应用。

package com.panku.web.redis;
import java.util.Collection;
import java.util.Set;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.DataType;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.HyperLogLogOperations;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ZSetOperations.TypedTuple;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* Spring RedisTemplate操作-HyperLogLog操作
* @author ccx
*
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class RedisTemplateHyperLogLog {
    @Resource(name="redisTemplate")
    private RedisTemplate<String, String> rt;

    public void flushdb(){
        rt.execute(new RedisCallback<Object>() {
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                connection.flushDb();
                return "ok";
            }
        });
    }
    @Test
    public void set(){
        flushdb();
        HyperLogLogOperations<String, String> vo = rt.opsForHyperLogLog();
        vo.add("book", "a","b","c");
        vo.add("bag", "a","e","d");
        vo.add("del", "f","g","h");



    }
    @Test
    public void get(){
        HyperLogLogOperations<String, String> vo = rt.opsForHyperLogLog();
        out(vo.size("book"));
        out(vo.size("bag"));
        out(vo.size("del"));
        out(vo.size("book","bag","del"));
        vo.delete("del");
        out(vo.size("book","bag","del"));
        vo.union("total", "book","bag","del");
        out(vo.size("total"));
    }

    public void out(String str){
        System.out.println(str);
    }
    public void out(Collection list){
        System.out.println(list);
    }
    public void out(long num){
        System.out.println(num);
    }
    public void out(boolean num){
        System.out.println(num);
    }
    public void out(DataType num){
        System.out.println(num);
    }
    public void out(Object str){
        System.out.println(str);
    }
    public void out(Set<TypedTuple<String>> set){
        for(TypedTuple<String> t : set){
            System.out.println(t.getValue()+"---"+t.getScore());
        }
    }
}