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README
Apache-2.0

LFS

File System(就是要最简单的,而且是最快的)

最新版貌似更快了……为虾米呢?最新数据是 24秒,快了 4秒(加了并发"行级锁"之后,怎么可能会更快?一定有其他地方的优化,一定……)
和 C 直接读写文件速度几乎一样,意味着几乎没有额外 CPU 消耗,还用过多的解释吗?

非常非常快的文件系统,可以同时存储海量大文件和小文件,高并发
存储视频音乐和图片等非常棒
并且可以作为列存储

链接:github git@osc

示例:(这不仅是极致简单的,而且是最快的)

//上传文件,只需一行
//?如果文件特别大怎么办,是不是需要切片?
//:为什么需要呢?依然只有这一行,10G? 100G? 1T? 都如你所愿
//?是否会有碎片?
//:1 个字节都木有
//?是否支持断点上传?会不会复杂?
//:如果我告诉你,依然只有这一行呢?仅仅多了两个参数而已
FileInputStream inputStream = new FileInputStream(file);
fileId = LFS_Stream.writeStream(FILE_NAME, fileId, inputStream, file.length());
//下载文件,依然只需一行
//?弱弱的问下,断点下载也很简单哈?
//:如你所想,再多 1 个 或 2 个参数就好
LFS_Stream.readStream(FILE_NAME, fileId, readStream);
//但是 IReadStream 需要自己设计(读出来的数据都通知给了 IReadStream,所以你自己得知道用数据干嘛才行,不是吗)
//这里是一个通过 http 显示图片的示例(竟如此简单,而且非常快)
IReadStream readStream = new IReadStream()
{
	public boolean init(long fileId, int size, long sizeTotal, long sizeTotalRead, long offset)
	{
		response.setIntHeader("Content-Length", (int)sizeTotalRead);
		response.setHeader("Cache-Control", "max-age=604800");
		response.setIntHeader("Etag", 0);
		return true;
	}

	//参数好多啊,不要被吓到了,只有前两个是你需要用的
	//其他的只是为了避免全局变量而已(如果需要的话,所幸,绝大多数场景都不会需要)
	public boolean parseData(byte[] b, int bytesAvalibale, int size, long sizeTotal, long sizeTotalRead, long sizeTotalReaded, long offset)
	{
		try {
			//这里应实现自己的数据输出,比如输出到 http
			response.getOutputStream().write(b, 0, bytesAvalibale);
			return true;
		} catch (Exception e) {}
		return false;
	}
};

脚本语言使用 lua,why?因为快且小,而且非常简单

指南针

#####设置端口号 LFS --port 9002

#####设置 IP(如:ipv6,默认同时侦听 ipv4 ipv6) LFS --host ::

#####设置文件存储目录 LFS --dir Storage

#####打开打印模式 LFS --print

#####守护进程 LFS --daemon

#####设置 Socket 的收发缓存大小 LFS --inBufferSize 102400 --outBufferSize 102400

测试数据

系统:OS X Yosemite
处理器:2 GHz Intel Core i7
内存:4 GB 1333 MHz DDR3
硬盘:Hitachi 500 GB SATA 磁盘

写入 27.5 万个分词,并构建索引(写入前先查询索引,去重):

  • 全部用时:28.246 s(含本机通信用时)
  • 服务用时:28.228273082 s

根据索引读取:

  • 全部用时:2 ms(含本机通信用时)
  • 服务用时:0.328847 ms

遍历查询(第 275542 项,共 275714 项)

  • 全部用时:2072 ms
  • 服务用时:2071.948199 ms
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