[jira] Commented: (VFS-238) DefaultFileMonitor fails to notice file creations, or re-creations

["Ralph Goers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/VFS-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681104#action_12681104 ] 

Ralph Goers commented on VFS-238:
---------------------------------

I created a unit test for this and it passes in all of these cases with a couple of caveats

1. monitor.addFile() must be called after the file is deleted for the recreate to be detected. The file is automatically removed from the listener when the file is deleted. Whether this is "correct" or not, it is working as designed.
2. Some events are very time sensitive. Due to polling intervals and the timestamp only being guaranteed to the second if things happen too quickly the events may not be detected. Additionally, when the file is deleted there is a bit of a delay before the listener is removed, so if monitor.addFile is called to quickly it may not result in the listener being readded.

> DefaultFileMonitor fails to notice file creations, or re-creations
> ------------------------------------------------------------------
>
>                 Key: VFS-238
>                 URL: https://issues.apache.org/jira/browse/VFS-238
>             Project: Commons VFS
>          Issue Type: Bug
>    Affects Versions: 1.0
>         Environment: linux, amd64 (ubuntu 8.10)
>            Reporter: Andy Brook
>
> As title, 
> {code}
> 		FileSystemManager fsManager = VFS.getManager();
> 		FileObject listendir = fsManager.resolveFile("/tmp/test.txt");
> 		
> 		fFileMonitor = new DefaultFileMonitor(new MailboxFileListener(this)); 
> 		fFileMonitor.setRecursive(true); 
> 		fFileMonitor.addFile(listendir);
> 		fFileMonitor.start(); 
> {code}
> h3. Uncreated initial state
> # If the file does not exist before the above is run, no 'create' even is fired when it is subsequently created.
> h3. Recreation use-case
> # If 'test.txt' exists, notifications of updates are generated as expected.  
> # If I now remove the file, I get a delete notification - as expected
> # If I now re-create the file, I get no notifications, even if updating.
> So this kind of breaks for me, the same behaviour was in the maven 2005.. jars.
> Am I misunderstanding what the DefaultFileMonitor is supposed to do?

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