Re: Monitoring a file for changes from Java?

David wrote:
> Not being too strong on the specifics of the Toolbox I would have expected 
> that in the sleep flow you would have something that would check if the file 
> modify, file.lastModified() , is different to the previous and if so fire a 
> FileEvent.

As I was printing out that idea to take in to the office, I realized why
it wouldn't help:

During the "sleep flow," as you put it, I wouldn't be both sleeping and
checking file.lastModified() at the same time. Effectively, I'd be
polling the file for its timestamp, rather than for the presence of
additional records.

What I ended up doing instead was to have the same thing that populates
the "event table" file (for which VIEWCUS was just a temporary stand-in)
also post a message to a *DTAQ, and then have the Java program wait on
the *DTAQ, with a one-minute timeout, so that it polls the event table
once a minute whether it appears to need it or not, as well as whenever
anything comes in on the *DTAQ.

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James H. H. Lampert
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