Netty源码03-Netty整体框架
Netty整体框架
前面两篇文章对Java NIO进行了详细的介绍和分析，也给下面分析Netty源码打下一定的基础
Java已经有了一个原生的NIO框架，为什么还会出现Netty呢，这个原因主要有两个：
- Java的NIO还不够高效，其底层使用 selector ，而Netty使用Linux下最高效的I/O模式 epoll
- Selector多路复用的开发模式较为复杂，需要在程序中自己 轮询 ，而且SelectionKey需要自己进行删除的管理，比较容易出错，而且由很多阻塞操作（ select ），Java自带的AIO更加难用。Netty是全异步操作，并且将底层IO操作全部封装，简化开发
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Java的NIO内存管理采用 ByteBuffer
， ByteBuffer
是出了名的难用，在使用的时候要是忘记
flip（）很容易出错。Netty提供的 ByteBuf 就好用了很多，其采用 读写双Index ，更加易用
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