shardjedis常用操作

shardjedis采用一致hash算法实现key的分片，通过计算key的hash值将key分布到不同的redis服务器上，从而达到横向扩展的目的。
以下介绍shardjedis的常用操作。

• 配置shardjedispool

@Configuration
@ComponentScan(basePackages = "config")
public class ShardJedisPool {
    @Autowired
    RedisConfig redisConfig;

    /**
     *获取jedisinfo信息
     * @return
     */
    private List jedisShardInfos(){
        String[] redisInfos = redisConfig.getRedisInfo().split(",");
        List jedisShardInfos = new ArrayList<>();
        for(String redisInfo :redisInfos){
            String[] part = redisInfo.split(":");
            jedisShardInfos.add(new JedisShardInfo(part[0],Integer.parseInt(part[1])));
        }
        return jedisShardInfos;
    }

    /**
     * 设置redis的参数配置
     * @return
     */
    @Bean
    public GenericObjectPoolConfig genericObjectPoolConfig(){
        GenericObjectPoolConfig genericObjectPoolConfig = new GenericObjectPoolConfig();
        genericObjectPoolConfig.setMaxIdle(redisConfig.getMaxIdle());
        genericObjectPoolConfig.setMaxTotal(redisConfig.getMaxTotal());
        genericObjectPoolConfig.setMinIdle(redisConfig.getMinIdle());
        genericObjectPoolConfig.setMaxWaitMillis(redisConfig.getMaxWaitMillis());
        return genericObjectPoolConfig;
    }

    /**
     * 获取shardjedis连接池
     * @param genericObjectPoolConfig
     * @return
     */
    @Bean
    public ShardedJedisPool shardedJedisPool(GenericObjectPoolConfig genericObjectPoolConfig){
        return new ShardedJedisPool(genericObjectPoolConfig,jedisShardInfos());
    }

• 常用方法

@Component
public class JedisAction {

    @Autowired
    private ShardedJedisPool shardedJedisPool;

    /**
     * 获取string类型的value
     * @param key
     * @return
     */
    public String get(String key){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()) {
            return shardedJedis.get(key);
        }
    }

    /**
     * 设置string类型的值
     * @param key
     * @param value
     */
    public void set(String key,String value){
       try (ShardedJedis shardedJedis = shardedJedisPool.getResource()){
           shardedJedis.set(key,value);
       }
    }

    /**
     * 删除key
     * @param key
     */
    public void del(String key){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            shardedJedis.del(key);
        }
    }

    /**
     * 判断key是否存在
     * @param key
     * @return
     */
    public boolean exits(String key){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            return shardedJedis.exists(key);
        }
    }

    /**
     * 获取key的类型
     * @param key
     * @return
     */
    public String type(String key){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            return shardedJedis.type(key);
        }
    }

    /**
     * 设置key的过期时间
     * @param key
     * @param seconds
     */
    public void expire(String key,final int seconds){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            shardedJedis.expire(key,seconds);
        }
    }

    /**
     * 根据key的模糊类型获取所有的key
     * @param pattern
     * @return
     */
    public List keys(String pattern){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            Collection allShards = shardedJedis.getAllShards();
            List keyList = new ArrayList<>();
            for(Jedis jedis:allShards){
                Set keys = jedis.keys(pattern);
                keyList.addAll(keys);
            }
            return keyList;
        }
    }

    /**
     * 获取所有匹配模糊key的value值
     * @param pattern
     * @return
     */
    public List getValues(String pattern){
        try(ShardedJedis shardedJedis = shardedJedisPool.getResource()){
            Collection allShards = shardedJedis.getAllShards();
            List values = new ArrayList<>();
            for(Jedis jedis:allShards){
                Set keys = jedis.keys(pattern);
                for(String key:keys){
                    values.add(getValue(jedis,key));
                }
            }
            return values;
        }
    }

    /**
     * 不区分key的类型获取key的value，可以匹配string,list,hash,set四种类型
     * @param jedis
     * @param key
     * @return
     */
    public String getValue(Jedis jedis,String key){
        String type = jedis.type(key);
        GetValue value = GetValue.valueOf(type.toUpperCase());
        return value.getValue(jedis,key);
    }
}

• 常用的key类型，用于辅助不区分key类型获取key的value值

public enum GetValue {
    LIST(){
        @Override
        public String getValue(Jedis jedis,String key) {
            List list = jedis.lrange(key, 0, jedis.llen(key));
            return "key="+key+"|type=list|value="+toString(list);
        }
    },
    HASH(){
        @Override
        public String getValue(Jedis jedis, String key) {
            Set keys = jedis.hkeys(key);
            return "key="+key+"|type=hash|value="+toString(keys);
        }
    },
    SET(){
        @Override
        public String getValue(Jedis jedis, String key) {
            Set smembers = jedis.smembers(key);
            return "key="+key+"|type=set|value="+toString(smembers);
        }
    },
    STRING(){
        @Override
        public String getValue(Jedis jedis, String key) {
            return "key="+key+"|type=string|value="+jedis.get(key);
        }
    };

    public abstract String getValue(Jedis jedis,String key);

    String toString(Collection collection){
        StringBuilder sb = new StringBuilder();
        Iterator iterator = collection.iterator();
        while (iterator.hasNext()){
            sb.append(iterator.next()).append(",");
        }
        return sb.substring(0,sb.length()-1);
    }
}

• 获取redis配置类

@Component
@Data
@PropertySource("config/properties")
public class RedisConfig {

    @Value("${redis.info}")
    private String redisInfo;

    @Value("${redis.pool.maxTotal}")
    private int maxTotal;

    @Value("${redis.pool.maxIdle}")
    private int maxIdle;

    @Value("${redis.pool.minIdle}")
    private int minIdle;

    @Value("${redis.pool.maxWaitMillis}")
    private int maxWaitMillis;
}

• redis配置

#redis实例
redis.info=192.168.127.128:6379,192.168.127.128:6380
#redis最大连接数
redis.pool.maxTotal=50
redis.pool.maxIdle=20
redis.pool.minIdle=10
redis.pool.maxWaitMillis=1000