I wrote my first comet actor today. Pretty neat stuff, and it was less
difficult and painful than I expected. :) I'm having a bit of an issue
figuring out how to render exactly what I want, though.
My comet actor tracks a series of data imports, and since the import
statuses change pretty rapidly, it makes more sense to poll at regular
intervals and redraw the entire table of imports or perhaps the
individual row than it does to do something more complex--at least for
now. What I want to do, though, is display the table but only if there
are imports active. If there are none, just display a paragraph stating
that none are currently in progress.
My issue is that since import statuses are displayed in a table, and
since there may be two or three, I seem to either be able to display an
empty table or nothing at all. Here's my template:
<lift:surround with="default" at="content">
<table>
<tr>
<th>Name</th><th>Complete</th><th>Total</th><th>Status</th>
</tr>
<lift:comet type="ImportMonitor">
<tr>
<td><import:name/></td>
<td><import:complete/></td>
<td><import:total/></td>
<td><import:status/></td>
</tr>
</lift:comet>
</table>
</lift:surround>
If I try putting the table into another template and having
ImportMonitor return <lift:embed>, I seem to get nothing. If I move the
<table> into the <lift:comet>, I get an entire table for each individual
import.
The only thing that occurs to me is to define the <table> in the code of
my render method. Is this my only option? Or am I missing something obvious?
Also, how are comet actors timed out? I notice that if I kill the
Firefox tab, I still get my printlns from the actor on my console, and I
don't see the debugging code around my unsubscription mechanism
triggered. Should I be doing something else to get localShutdown
triggering, or does that happen when the sessions are cleaned up? If
shutdown methods are only run on session expiration, is there any other
way to tell a master publishing actor that it doesn't have to do any
work on the behalf of a listener that no longer pays attention?
Thanks.
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