redis-java中的callback回掉机制

springboot整合redis后, 会提供StringRedisTEmplate和 RedisTemplate 两个模板类供食用, 有时候这并不能满足我们的需求, 需要使用 connect 处理, 除了 redisTemplate.getConnection() 之外, 还可以使用callback机制进行处理

具体使用:

 @Resource(name = "shardedJedisPool")
    private ShardedJedisPool shardedJedisPool;  

    @Override
    public <T> T execute(ConnectionCallback<T> action) {
        ShardedJedis shardedJedis = null;
        try{
            // 从连接池中获取jedis分片对象
            shardedJedis = shardedJedisPool.getResource();  

            return action.doInRedis(shardedJedis);  

        }catch (Exception e){
            System.out.println(e.getMessage());
        }finally {
            if(null != shardedJedis){
                shardedJedis.close();
            }
        }
        return null;
    }  

   /**
     * attention:真正封装的方法，非常的简洁干脆
     */
    public String set(final String key, final String value){
        return execute(new ConnectionCallback<String>() {
            @Override
            public String doInRedis(
                    ShardedJedis shardedJedis) {
                return shardedJedis.set(key, value);
            }
        });
    }  

    public String get(final String key){
        return execute(new ConnectionCallback<String>(){
            @Override
            public String doInRedis(ShardedJedis shardedJedis) {
                return shardedJedis.get(key);
            }
        });
    }  

保存:

 redisTemplate.execute(new RedisCallback<Object>() {
        @Override
        public Object doInRedis(RedisConnection connection)
                throws DataAccessException {
            connection.set(
                    redisTemplate.getStringSerializer().serialize(
                            "user.uid." + user.getUid()),
                    redisTemplate.getStringSerializer().serialize(
                            user.getAddress()));
            return null;
        }
    });  

获取:

 return redisTemplate.execute(new RedisCallback<User>() {
        @Override
        public User doInRedis(RedisConnection connection)
                throws DataAccessException {
            byte[] key = redisTemplate.getStringSerializer().serialize(
                    "user.uid." + uid);
            if (connection.exists(key)) {
                byte[] value = connection.get(key);
                String address = redisTemplate.getStringSerializer()
                        .deserialize(value);
                User user = new User();
                user.setAddress(address);
                user.setUid(uid);
                return user;
            }
            return null;
        }
    });  

删除:

  redisTemplate.execute(new RedisCallback<Object>() {
        public Object doInRedis(RedisConnection connection) {
            connection.del(redisTemplate.getStringSerializer().serialize(
                    "user.uid." + uid));
            return null;
        }
    });  

说实话, 不知道比redistemplate 优在哪.. 有知道的可以跟我说下