> It is the Xron DTML Method's responsibility to reschedule itself.
> It could be its first duty, however. Then again, as all the work happens
> inside a ZODB transaction, it doesn't matter when the reschedule
As a side note, I do not like the fact that Xron requires you to use special
DTML methods. I suppose this is a requirement in this architecture due to
the fact they need to be autocataloged, but I don't really like that feature
> > What does the Dispatcher thread do? Does it fire off worker threads?
> Xron has a single dispatcher thread. This thread knows how long to sleep
> for until the next job needs to run.
Do you think this is this any more effective than having a producer thread
do a lookup every minute to see what jobs are current, after which it should
put the current jobs in a queue? E.g., as the "run" method of a separate
t = localtime(time())
sleeptime = (60 - t[SECOND])
for event in self.eventdata.values():
> It uses Client.py to run a job.
Why is this? This doesn't make any sense to me on its face. Why not just
call the method from a separate thread?
> > What are other threads in Xron doing while the Dispatcher thread is
> > What are the other threads?
> There are no other threads in Xron.
> Xron creates a single thread to do all event dispatching. The work is
> done in Zope ZODB threads (or whatever the correct terminology is). The
> dispatcher thread communicates with a ZODB thread by using Client to
> make a web request.
I see... would it be naive if I were to say that I think that a scheduler
should fire off threads of its own and not rely on an external facility to
run the jobs?
> Xron usually makes requests as the anonymous user. However, I've patched
> my Xron to make requests as XronUser by hardcoding (!) the username and
> password for that in the RPC.py module of Xron. Then, I've manually
> created a XronUser user in my root user folder. I give XronUser the
> local roles needed to run methods I want to be scheduled via Xron.
If this were handled not using Client.py, I think we could just use the
security manager to change users.
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