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Posted to issues@commons.apache.org by "Boris Petrov (JIRA)" <ji...@apache.org> on 2018/02/28 10:33:00 UTC
[jira] [Comment Edited] (VFS-654) File system events API
[ https://issues.apache.org/jira/browse/VFS-654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380108#comment-16380108 ]
Boris Petrov edited comment on VFS-654 at 2/28/18 10:32 AM:
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Thank you for the quick response. I spent a significant amount of time researching this. [Samba 3 has support for notifications since version 3.0.25|https://wiki.samba.org/index.php/Samba_3.0_Features_added/changed]. Of course, local file systems have the *inotify* functionality (that's on Linux, I'm pretty sure there is something on Windows). Maybe these are the only two available.
Samba 3 support is along the way in [smbj|https://github.com/hierynomus/smbj] and there is a [pull request|https://github.com/apache/commons-vfs/pull/26] for VFS for that library (which I hope you'll merge soon). I guess they will add notifications support once *smbj* has them and you expose some API in VFS.
As for other file systems - I really don't know. NFS seems to have such support (at least I read that it can be used with *inotify* so there obviously is something. NFS is supported by [this library|https://github.com/danniss/common-vfs2-nfs]. WebDAV also seems to be able to trigger some kind of notifications but I am not sure. I'll have to research more. In any case - such an API by VFS is definitely a nice thing to have and then it's up to the driver to implement it if possible.
was (Author: boris-petrov):
Thank you for the quick response. I spent a significant amount of time researching this. [Samba 3 has support for notifications since version 3.0.25.|https://wiki.samba.org/index.php/Samba_3.0_Features_added/changed]. Of course, local file systems have the *inotify* functionality (that's on Linux, I'm pretty sure there is something on Windows). Maybe these are the only two available.
Samba 3 support is along the way in [smbj|https://github.com/hierynomus/smbj] and there is a [pull request|https://github.com/apache/commons-vfs/pull/26] for VFS for that library (which I hope you'll merge soon). I guess they will add notifications support once *smbj* has them and you expose some API in VFS.
As for other file systems - I really don't know. NFS seems to have such support (at least I read that it can be used with *inotify* so there obviously is something. NFS is supported by [this library|https://github.com/danniss/common-vfs2-nfs]. WebDAV also seems to be able to trigger some kind of notifications but I am not sure. I'll have to research more. In any case - such an API by VFS is definitely a nice thing to have and then it's up to the driver to implement it if possible.
> File system events API
> ----------------------
>
> Key: VFS-654
> URL: https://issues.apache.org/jira/browse/VFS-654
> Project: Commons VFS
> Issue Type: New Feature
> Affects Versions: 2.2
> Reporter: Boris Petrov
> Priority: Major
>
> Currently the DefaultFileMonitor walks the whole file system and notifies when something changes. For large file systems and (near) real-time requirements this is _extremely_ inefficient. Some file systems have an events API which could be exposed (like *inotify*). Has any work towards that ever been done?
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