Wow. I was looking for something like this. I was using Captain FTP
and their companion app Crowznest. Only problem is, THEY DIDN'T WORK
RIGHT! I may look into this as an alternative means of managing watch
folders.
I know from talking with Tech Support that the Mac OS does in fact
have a mechanism for setting up and generating an event when the
contents of a folder have changed. But therein lies a difficulty. When
does the event get generated? If I copy 10 large files to a network
share, the OS will generate the event right away, but not all the
files are there yet. Any software reacting to that event will not get
"the full picture" of what happened, and that is exactly what was
happening to me. Some files get processed by Captain FTP, some do not.
And what happens if my "watcher" app was not running at the time the
event was generated? NOTHING gets processed.
Your solution (which I presume checks the the present condition
against the last know condition) might be just exactly the thing I am
looking for. Now if I had a means to FTP the file directly from
Revolution and not proceed with the next until the first file was
finished, I would be golden. I am FTPing to a tape drive that has an
FTP interface, but the read/writes are by nature linear so only one
stream can occur at one time. This may be the perfect answer to the
problem.
Bob Sneidar
IT Manager
Logos Management
Calvary Chapel CM
On Jan 21, 2009, at 9:10 AM, Richard Gaskin wrote:
viktoras wrote:
why not instead let user choose folders or files that should be
monitored and then monitor these by comparing files (get files
etc...),
folders (get folders) regularly. Use recursion to get into sub
folders,
etc. Revolution is fast enough to do this efficiently.
That's an excellent idea. I was curious about how responsive it would
be, so I took a couple minutes to throw together an example of this
and
it seems reasonably efficient.
I've posted the example to RevNet - in Rev, choose
Development->Plugins->GoRevNet, and in RevNet look for "4W Folder
Watcher" in the Stacks section.
This modest example lets you pick a folder and it checks for changes
to
files (name, size, additions, deletions). It also provides a slider
to
govern the interval between checks so you can experiment to find the
best balance between system overhead and responsiveness.
One useful aspect of it is that the folder watching hander accepts the
name of a callback handler as a param, so you can handle the change
event however you like without having to modify the folder watcher
handler itself.
This is a very simple example, with lots of room for improvements like
also checking folder changes within the target folder, and possibly
sending additional info about exactly what changed to the callback
handler if needed.
But as a quick-n-dirty experiment, at least it shows that Rev can be
used to monitor changes to folder contents with relative ease and
acceptable efficiency for many uses, and on all supported platforms.
--
Richard Gaskin
Fourth World
Revolution training and consulting: http://www.fourthworld.com
Webzine for Rev developers: http://www.revjournal.com
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