异步IO在Java中？ [英] Asynchronous IO in Java?

问题描述

有关异步IO（插座型）是存在于其他的Java然后java.nio的选择是什么？也做java.nio中的底色使用线程（我认为.NET的异步套接字库做，也许它已经改变）或者是真正的异步IO使用适当的选择调用？

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?

推荐答案

Java的NIO包（为的Java6的），提供的非阻塞支持I / O 的唯一，通过的选择秒。 java7目录是希望要与NIO.2，其中包括异步I / O支持出货。如今，最好的办法是利用一个框架。停战提到米娜。这里有一些其他。

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.

1. 灰熊。这是Sun的的GlassFish服务器的I / O核心。灰熊提供了这样一个异步设施读/写操作（通过一个队列模型）。它支持TCP和UDP的一致好评。我用灰熊在几个项目。有些事情我喜欢和不喜欢的框架，但细节，这是真正的另外一个话题。我会说，这是很容易得到的东西和运行，灰熊做了很多繁重的工作适合你。


2. Netty的。该项目来源于对米娜项目的原作者之一。我没有使用过这一个，所以我不知道关于它的异步I / O支持。你应该看一看。

1. 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.
2. 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.

现在，关于你对线程的问题，NIO选择器不要使用非阻塞I / O线程。在JDK6他们使用选择（） Windows和较新的Linux内核的epoll的设备下。对于异步I / O，线程的细节依赖于框架。

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.

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