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Date: Fri, 13 Sep 2002 15:11:59 +0200
To: cocoon-dev@xml.apache.org
Subject: Re: Add support for instrumentation ?
Message-ID: <20020913131159.GB9892@fztig938.bank.dresdner.net>
References: <20020913111838.GB3999@fztig938.bank.dresdner.net>
 <3D81E13D.8050609@anyware-tech.com>
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From: Marcus Crafter <crafterm@fztig938.bank.dresdner.net>

On Fri, Sep 13, 2002 at 02:59:41PM +0200, Sylvain Wallez wrote:
> Marcus Crafter wrote:
> 
> >Hi All,
> >
> >	Hope all is well.
> >	
> >	I've been playing around with adding excalibur instrumentation
> >	support to cocoon over the past couple of days
> >	(http://jakarta.apache.org/avalon/excalibur/instrument/index.html)
> >	
> >	The initial results look quite nice (a sample screenshot of the
> >	instrument client in action is available at
> >	http://cvs.apache.org/~crafterm/instrumentation.jpg), allowing you
> >	to see what's going on inside your cocoon application as it happens.
> >	
> >	Does anyone see any problems with adding this support to HEAD (or
> >	should I wait till after 2.1 is released) ?
> >	
> >
> 
> +1e1000 for HEAD now !!!
> 
> This looks really, really cool.

	Yes, I think it rocks! :)

> A question that customers often ask is "how can I debug or tune the 
> application". By combining this extra-cool instrumentation, the profiler 
> and captor, we're starting to have good answers.
> 
> A question however about the cost of instrumentation : is it possible to 
> know if an instrument is active to avoid costly value computations, in 
> the same way as we test logger.isDebugEnabled() ?

	Yes, the instrumentation api is similar to the logkit api in that
	sense - AbstractInstrument (http://jakarta.apache.org/avalon/excalibur/instrument/api/org/apache/excalibur/instrument/AbstractInstrument.html)
	defines an isActive() method which can be tested to see if the
	instrument is currently being used.
	
	On top of that I've added a general 'enable-instrumentation'
	startup parameter which can be used to completely disable
	the creation of an instrument-manager if its not needed.
	
	Cheers,
	
	Marcus

-- 
        .....
     ,,$$$$$$$$$,      Marcus Crafter
    ;$'      '$$$$:    Computer Systems Engineer
    $:         $$$$:   ManageSoft GmbH
     $       o_)$$$:   82-84 Mainzer Landstrasse
     ;$,    _/\ &&:'   60327 Frankfurt Germany
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