@Override
	public Result<List<StorageInfo>> exec(Socket socket) throws IOException {
		request(socket.getOutputStream());
		Response response = response(socket.getInputStream());
		if(response.isSuccess()){
			byte[] data = response.getData();
			int dataLength = data.length;
			if(dataLength%StorageInfo.BYTE_SIZE!=0){
				throw new IOException("recv body length: " + data.length + " is not correct");
			}
			List<StorageInfo> storageInfos = new ArrayList<StorageInfo>();
			int offset = 0;
			while(offset<dataLength){
				StorageInfo storageInfo = new StorageInfo(data,offset);
				storageInfos.add(storageInfo);
				offset += StorageInfo.BYTE_SIZE;
			}
			return new Result<List<StorageInfo>>(response.getCode(), storageInfos);
		}else{
			return new Result<List<StorageInfo>>(response.getCode(), "Error");
		}
	}