Thanks for the suggestion. One question about this technique: can I
run the directory check loop directly in the contextInitialized event of
the Listener, or is it mandatory to create a new thread?

Dave


Tim Funk wrote:

> Various operating system allow hooks to do be notified when items in
> the filesystem change. But since we're using java - thats not the case
> here so you need to something generic such as the following:
>
> Create a new ServletContextListener - this will run once one webapp
> loading. Have this spawn a new thread which watches the directory in
> question. The thread will need to perform a directory listing to
> detect changes - the strategy for determining changes can vary**. The
> thread will operate in an infinite loop sleeping as per your
> threshold. The inifinte loop should contain a conditional so it can be
> stopped when the destory method of the ServletContextListener is
> called too.
>
>
> David Kerber wrote:
>
>> Hi, Tomcatters -
>>
>> I have a working application to which I need to add a new function,
>> where I need to watch a networked directory (not on the local tomcat
>> server machine) for newly-appearing files, which I will then
>> process. I need to have this done at intervals not exceeding about
>> two minutes. The files are sent by a remote machine doing an ftp
>> put, over the internet.
>>
>> I can handle the file reading and processing with no trouble, but
>> I've never done this kind of directory watching before. Can somebody
>> give me some suggestions on how to do this? Is there some kind of
>> function that will trigger an event when a new file appears? Do I
>> put a 1 minute sleep in a loop, and check for new files each time
>> through? Or something else?
>



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