哪些操作系统支持在Java中查看本机（类似inotify）文件 [英] Which Operating Systems support native (inotify-like) file watching in Java

问题描述

JavaDoc for java.nio.file.WatchService states;

The JavaDoc for java.nio.file.WatchService states;

实现...是
，用于直接映射到本机文件事件通知
facility （如果可用），或者使用原始机制，例如
polling ，当本地设施不可用时。

The implementation ... is intended to map directly on to the native file event notification facility where available, or to use a primitive mechanism, such as polling, when a native facility is not available.

我认为这意味着它会尝试一种轻量级的本机机制（如果可以的话）如果不能在Linux上 inotify 并进行轮询，如果不能。

I assume this means it will try a lightweight, native mechanism when it can (something like inotify on Linux) and poll if it can not.

这是正确的吗？

哪些操作系统可能或不可能提供此类设施？ Linux的发行版级别真的很有用，或者我可以假设如果JVM在* unix上运行，它将受支持吗？

What operating systems are likely or unlikely to provide such a facility? Distro level for Linux would be really useful or can I assume that if the JVM runs on *unix, it will be supported?

推荐答案

这应该是一个评论，但它太大了，不能发布它......

This should have probably been a comment, but it's too big to post it as such...

我在看 jdk-9 来源（也可以在jdk-8回购中轻松搜索），但这里有一些与你的问题评论有关：

I am looking at jdk-9 sources (could easily be searched in the jdk-8 repo as well), but here is some relevant to your question comments:

   /**
     * Linux implementation of WatchService based on inotify.
     *
     * In summary a background thread polls inotify plus a socket used for the wakeup
     * mechanism. Requests to add or remove a watch, or close the watch service,
     * cause the thread to wakeup and process the request. Events are processed
     * by the thread which causes it to signal/queue the corresponding watch keys.
     */

 class LinuxWatchService  extends AbstractWatchService

对于windows ：

And for windows:

/*
 * Win32 implementation of WatchService based on ReadDirectoryChangesW.
 */

class WindowsWatchService extends AbstractWatchService

依此类推..你可以找到所有可用的实现：

And so on.. you can find all the available implementations under:

 jdk/src/java.base/{windows|unix|solaris|linux...}/classes/sun/nio/fs/

正如OS实际支持的那样，看起来这需要你看看实际的发行版。

As what OS actually supports this, it seems like that would require for you to look at the actual distro.

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