[jboss-dev] Improving scanning performance

[Scott Marlow]

Ales Justin wrote:
> All of this already exists. ;-)
>
>> * You should have a AnnotationScanner deployer that scans jars for 
>> annotations and puts an annotation database somewhere in memory that 
>> other deployers can reference.  (This might already exist, I don't 
>> know).
>
> It is called AnnotationEnvironment, and it's part of the deployment's 
> attachments.
>
> It's already used to help Metadata get annotation info.
> But how it's done in Metadata is bad/wrong.
>
>> * If a file META-INF/no.scan exists in a jar, then don't scan the 
>> file.  This allows libraries to exclude themselves from scanning.
>>
>> * If a file META-INF/scan.only exists it will contain a newline 
>> delimited list of class names to scan.  Only scan those class names.
>
> This is called jboss-scanning.xml.
>  - http://www.jboss.org/community/wiki/JBoss5custommetadatafiles
I hacked my local trunk (6) build to use jboss-scanning.xml and don't 
see much of an impact on boot performance.  Prior to the 
jboss-scanning.xml changes, we were scanning about 600 classes for 
annotations.  After the changes, we scan zero classes for annotations 
(as per trace logging in o.j.d.p.a.GenericAnnotationResourceVisitor).  
My local timings are:

Before the change:

  Started in 35s:304ms

  Started in 33s:229ms

  Started in 34s:445ms

After adding jboss-scanning.xml:

  Started in 33s:324ms

  Started in 34s:163ms

  Started in 33s:957ms



>
> We already exclude all of our boot.
> See metadata-deployer-jboss-beans.xml:
>  - 
> http://anonsvn.jboss.org/repos/jbossas/branches/Branch_5_x/server/src/etc/deployers/metadata-deployer-jboss-beans.xml 
>

FYI, JBAS-7025 is about excluding our boot with separate 
jboss-scanning.xml files, instead of using a central list 
(metadata-deployer-jboss-beans.xml).

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