redis-java中的callback回掉機制

springboot整合redis后, 會提供StringRedisTEmplate和 RedisTemplate 兩個模板類供食用, 有時候這並不能滿足我們的需求, 需要使用 connect 處理, 除了 redisTemplate.getConnection() 之外, 還可以使用callback機制進行處理

具體使用: 

 @Resource(name = "shardedJedisPool")  
    private ShardedJedisPool shardedJedisPool;  
      
    @Override  
    public <T> T execute(ConnectionCallback<T> action) {  
        ShardedJedis shardedJedis = null;  
        try{  
            // 從連接池中獲取jedis分片對象  
            shardedJedis = shardedJedisPool.getResource();  
              
            return action.doInRedis(shardedJedis);  
              
        }catch (Exception e){  
            System.out.println(e.getMessage());  
        }finally {  
            if(null != shardedJedis){  
                shardedJedis.close();  
            }  
        }  
        return null;  
    }  
      
   /** 
     * attention:真正封裝的方法，非常的簡潔干脆 
     */  
    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;  
        }  
    });  

獲取: 

 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;  
        }  
    });  

刪除: 

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

 

 

說實話, 不知道比redistemplate 優在哪.. 有知道的可以跟我說下