Spring RedisTemplate 批量获取值的2种方式小结

List<String> keys = new ArrayList<>();
//初始keys
List<YourObject> list = this.redisTemplate.opsForValue().multiGet(keys);

List<YourObject> list = this.redisTemplate.executePipelined(new RedisCallback<YourObject>() {
    @Override
    public YourObject doInRedis(RedisConnection connection) throws DataAccessException {
        StringRedisConnection conn = (StringRedisConnection)connection;
        for (String key : keys) {
            conn.get(key);
        }
        return null;
    }
});

    /**
     * Executes the given action object within a connection that can be exposed or not. Additionally, the connection can
     * be pipelined. Note the results of the pipeline are discarded (making it suitable for write-only scenarios).
     *
     * @param <T> return type
     * @param action callback object to execute
     * @param exposeConnection whether to enforce exposure of the native Redis Connection to callback code
     * @param pipeline whether to pipeline or not the connection for the execution
     * @return object returned by the action
     */
    public <T> T execute(RedisCallback<T> action, boolean exposeConnection, boolean pipeline) {
        Assert.isTrue(initialized, "template not initialized; call afterPropertiesSet() before using it");
        Assert.notNull(action, "Callback object must not be null");
 
        RedisConnectionFactory factory = getConnectionFactory();
        RedisConnection conn = null;
        try {
 
            if (enableTransactionSupport) {
                // only bind resources in case of potential transaction synchronization
                conn = RedisConnectionUtils.bindConnection(factory, enableTransactionSupport);
            } else {
                conn = RedisConnectionUtils.getConnection(factory);
            }
 
            boolean existingConnection = TransactionSynchronizationManager.hasResource(factory);
 
            RedisConnection connToUse = preProcessConnection(conn, existingConnection);
 
            boolean pipelineStatus = connToUse.isPipelined();
            if (pipeline && !pipelineStatus) { //开启管道
                connToUse.openPipeline();
            }
 
            RedisConnection connToExpose = (exposeConnection ? connToUse : createRedisConnectionProxy(connToUse));
            T result = action.doInRedis(connToExpose);
 
            if (pipeline && !pipelineStatus) {// 关闭管道
                connToUse.closePipeline();
            }
 
            // TODO: any other connection processing?
            return postProcessResult(result, connToUse, existingConnection);
        } finally {
 
            if (!enableTransactionSupport) {
                RedisConnectionUtils.releaseConnection(conn, factory);
            }
        }
    }

List<String> keys = new ArrayList<>();
for (Book e : booklist) {
   String key = generateKey.getKey(e);
   keys.add(key);
}
List<Serializable> resultStr = template.opsForValue().multiGet(keys);

public executePipelined(RedisCallback<?> action) {...}

List<Object> redisResult = redisTemplate.executePipelined(new RedisCallback<String>() {
   @Override
    public String doInRedis(RedisConnection redisConnection) throws DataAccessException {  
        for (BooK e : booklist) {
       StringRedisConnection stringRedisConnection =(StringRedisConnection)redisConnection;
        stringRedisConnection.get(e.getId());
        }
       return null;
    }
});

public List<Object> executePipelined(final RedisCallback<?> action, final RedisSerializer<?> resultSerializer) {...}

List<Object> redisResult = redisTemplate.executePipelined(
  new RedisCallback<String>() {
    // 自定义序列化
    RedisSerializer keyS = redisTemplate.getKeySerializer();
    @Override
    public String doInRedis(RedisConnection redisConnection) throws DataAccessException {
        for (BooK e : booklist) {
              redisConnection.hGet(keyS.serialize(e.getName()), keyS.serialize(e.getAuthor()));
        }
        return null;
    }
  }, redisTemplate.getValueSerializer()); // 自定义序列化