高并发扩容之缓存

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缓存

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缓存 Guava Cache

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• 学习redis网站 redis.cn

• RedisConfig

package com.alan.concurrency.example.cache;


import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

@Configuration
public class RedisConfig {


    @Bean(name="redisPool")
    public JedisPool jedisPool(@Value("${jedis.host}") String host,
                               @Value("${jedis.port}") int port){

        return new JedisPool(host,port);
    }

}

• RedisClient

package com.alan.concurrency.example.cache;


import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import javax.annotation.Resource;

@Component
public class RedisClient {


    @Resource(name="redisPool")
    private JedisPool jedisPool;


    public void set(String key,String value) throws Exception{

        Jedis jedis = null;

        try {
            jedis = jedisPool.getResource();
            jedis.set(key,value);

        } finally {

            if (jedis != null){
                jedis.close();
            }
        }
    }


    public String get(String key) throws Exception{
        Jedis jedis = null;

        try {
            jedis = jedisPool.getResource();
            return  jedis.get(key);

        } finally {

            if (jedis != null){
                jedis.close();
            }
        }

    }

}

• CacheController

package com.alan.concurrency.example.cache;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/cache")
public class CacheController {


    @Autowired
    private RedisClient redisClient;


    @RequestMapping("/set")
    @ResponseBody
    public String set(@RequestParam("k") String k , @RequestParam("v") String v) throws  Exception{

        redisClient.set(k,v);
        return "SUCCESS";

    }


    @RequestMapping("/get")
    @ResponseBody
    public String get(@RequestParam("k") String k) throws  Exception{
         return  redisClient.get(k);

    }

}

高并发场景下缓存常见问题

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