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From "Glenn R. Golden" <ggol...@umich.edu>
Subject Re: NewRSSPortlet expiration
Date Wed, 05 Jun 2002 01:48:57 GMT
Well, I think I get it now -

It's the DiskCacheDaemon which periodically checks all entries in the 
JetspeedDiskCache for possible updates.  When it finds one, the portlet 
notices a new file and produces new output.

Pretty neat.

The DiskCacheDaemon by default jr.p configuration runs once an hour.  
News focused sites might want to get this running more frequently.

- Glenn

On Tuesday, June 4, 2002, at 08:27  PM, Glenn R. Golden wrote:

> Does anybody know (and be willing to explain) how an RSS portlet is 
> supposed to decide that it's shown the same page long enough and show a 
> new one?  It seems to involve how long an entry is stuck in the 
> JetspeedDiskCache (looks like that should be 15 minutes only) and how 
> often the source actually changes - but the portlet itself seems to 
> cache the results and this needs to be updated... Since it's a 
> FileWatcherPortlet it seems to want to change when the disk changes, 
> but won't the disk remain the same until somebody asks for a new 
> version?
> If anybody has a brief explaination that they would share I'd 
> appreciate it.
> In my tests, a very old version of the RSS content that starts up in 
> the cache directory and should have expired at best after 15 minutes is 
> never expiring for the latest version of the feed...  I'm trying to 
> figure out why.
> Thanks!

- Glenn

Glenn R. Golden    Systems Research Programmer
School of Information             University of Michigan
ggolden@umich.edu                            734-615-1419
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