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From Sylvain Wallez <sylvain.wal...@anyware-tech.com>
Subject Re: Adding Resource Monitor to Generators
Date Mon, 10 Dec 2001 13:57:12 GMT


Gerhard Froehlich a écrit :
> 
> Hi,
> I started to implement the Resource Monitor into
> the caching process.
> 
> One place are the Generators (FileGenerator, etc..), therefore
> I have to lookup up the Monitor component.
> Where shall I place the contextualize method in the Generator
> derivation tree:
> 
> ComposerGenerator
>   AbstractGenerator
>     AbstractXMLProducer
> 
> ?
> 
> I ask, 'cause I don't want to rain in somebodies "Generator" party ;)
> 
> Cheers
> Gerhard
> 
Gerhard,

I'm happy you start working on Monitors : reducing filesystem lookup is
a must-do to increase performance. But I have a few wonders about the
way to introduce them in the engine.

I didn't went deep in Monitors, but is it good to use an active monitor
? From what I understand, an active monitor scans periodically (10 secs
in cocoon.xconf) all its resources.

This means that every 10 secs, Cocoon will scan *each and every* file
monitored since the engine startup, even those that are unfrequently
used. I'm afraid this will be worse than what we have today on large
sites... but tell me if I'm wrong !

It seems to me that the main benefit of ActiveMonitor is for resources
that are systematically checked at each and every request : IMO, this
should be limited to configuration files and sitemaps.

For less-frequently used resources, wouldn't it be a better solution to
only call getLastModified() when the resource is actually used and the
time since the last call to getLastModified() is greater than the
refresh period ? This would be a kind of buffering in front of the
filesystem. Also, can't this be integrated directly in Source ?

Last point : your changes in ProgramGenerator make the assumption that
sources are files. This won't be true in unexpanded war files and will
very likely break the engine ;)

What do you (and others) think ?

Sylvain.

-- 
Sylvain Wallez
Anyware Technologies - http://www.anyware-tech.com

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