问题描述
java.nio.file.WatchService
的 JavaDoc 状态;
The JavaDoc for java.nio.file.WatchService
states;
实现...是旨在直接映射到 本地文件事件通知设施(如果可用),或使用原始机制,例如轮询,当本地设施不可用时.
我认为这意味着它会在可以的情况下尝试轻量级的原生机制(类似于 Linux 上的 inotify
),如果不能,则进行轮询.
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.
正确吗?
哪些操作系统可能或不可能提供这样的功能?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,它将得到支持吗?
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,不能这样发布...
This should have probably been a comment, but it's too big to post it as such...
我正在查看 jdk-9
源(也可以在 jdk-8 存储库中轻松搜索),但这里有一些与您的问题评论相关的内容:
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
对于窗户:
/*
* Win32 implementation of WatchService based on ReadDirectoryChangesW.
*/
class WindowsWatchService extends AbstractWatchService
等等......你可以在下面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/
由于操作系统实际支持此功能,因此您似乎需要查看实际发行版.
As what OS actually supports this, it seems like that would require for you to look at the actual distro.
这篇关于哪些操作系统支持在 Java 中查看本机(类似 inotify)文件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!