Java中的异步IO(Asynchronous IO in Java?)

Java中的异步IO(Asynchronous IO in Java?)

什么选项的async io（基于套接字）在java其他然后java.nio？ java.nio还使用backround中的线程（正如我认为.NET的async-socket-library所做的那样，或许已经被更改），或者是使用正确的select调用“true”async io？

What options for async io (socket-based) are there in java other then java.nio? Also does java.nio use threads in the backround (as I think .NET's async-socket-library does, maybe it's been changed) or is it "true" async io using a proper select call?

最满意答案

Java的NIO包（从Java6开始）仅通过选择器提供对非阻塞I / O的支持。 Java7希望随NIO.2一起出货，其中包括异步I / O支持。 今天，你最好的办法是利用一个框架。 ARMistice提到了米娜。 这里有一些。

灰熊 这是Sun的GlassFish服务器的I / O核心。 Grizzly提供了进行异步读/写（通过队列模型）的功能。 它支持TCP和UDP。 我在几个项目中使用了灰熊。 有一些我喜欢和不喜欢的框架，但是细节这是另一个话题。 我会说，这是很容易得到一些运行和灰熊为你做了很多重的举措。 网吧 这个项目来自于Mina项目的原创作者之一。 我没有使用这个，所以我不知道它对异步I / O的支持。 你应该看看。

现在，关于你对线程的问题，NIO选择器不使用线程进行非阻塞I / O。 在JDK6中，他们使用Windows下的select（）和更新的Linux内核上的epoll工具。 对于异步I / O，线程细节取决于框架。

Java's NIO package (as of Java6), provides support for non-blocking I/O only, via Selectors. Java7 is hopefully going to ship with NIO.2, which includes asynchronous I/O support. Today, your best bet is to make use of a framework. ARMistice mentioned Mina. Here are some others.

Grizzly. This is the I/O core for Sun's GlassFish server. Grizzly provides a facility for doing asynchronous reads/writes (via a queue model). It supports TCP and UDP alike. I've used Grizzly in a couple of projects. There are things I like and dislike about the framework, but to detail this is really another topic. I will say that it's quite easy to get something up and running and Grizzly does a lot of the heavy lifting for you. Netty. This project comes from one of the original authors on the Mina project. I haven't used this one so I don't know about about its support for asynchronous I/O. You should take a look.

Now, with regard to your question about threads, NIO Selectors do not use threads for non-blocking I/O. In JDK6 they use select() under Windows and the epoll facility on newer Linux kernels. For asynchronous I/O, threading details depend on the framework.