Hi Simone,
Thank you so much for your explanation. It's preety clear!
Regards, Federico.
-----Mensaje original-----
De: aspectj-users-boun...@eclipse.org
[mailto:aspectj-users-boun...@eclipse.org] En nombre de Simone Gianni
Enviado el: lunes, 08 de junio de 2009 13:16
Para: aspectj-users@eclipse.org
Asunto: Re: [aspectj-users] About aop.xml scope
Hi Federico and Tahir,
Tahir guess is right : there is no "jar" scope in Java, not because it
would not be a good idea, simply because there is no support for that in
the Java classloading system. When using an URL classloader it is
possible to know from which jar that resource is coming from, but only
using methods specific to URLClassLoader and/or interpreting the
Class.getResource returned URL in an implementation specific mapping,
both solutions are not applicable in a real production environment,
especially when web application servers come in play with their own
classloaders.
Multiple aop.xml files are detected and merged together, as explained
here
http://www.eclipse.org/aspectj/doc/released/devguide/ltw-configuration.html
:
When several configuration files are visible from a given weaving class
loader their contents are conceptually merged. The files are merged in
the order they are found on the search path (with a regular
getResourceAsStream lookup) according to the following rules:
*
The set of available aspects is the set of all declared and
defined aspects (aspect and concrete-aspect elements of the
aspects section).
*
The set of aspects used for weaving is the subset of the available
aspects that are matched by at least one include statement and are
not matched by any exclude statements. If there are no include
statements then all non-excluded aspects are included.
*
The set of types to be woven are those types matched by at least
one weaver include element and not matched by any weaver exclude
element. If there are no weaver include statements then all
non-excluded types are included.
*
The weaver options are derived by taking the union of the options
specified in each of the weaver options attribute specifications.
Where an option takes a value e.g. -warn:none the most recently
defined value will be used.
It is not an error for the same aspect to be defined to the weaver in
more than one visible META-INF/aop.xml file. However, if the same
concrete aspect is defined in more than one aop.xml file then an error
will be issued. A concrete aspect defined in this way will be used to
weave types loaded by the class loader that loaded the aop.xml file in
which it was defined.
In a web application "the order they are found" will be :
- WEB-INF/classes/...
- WEB-INF/lib/*.jar (I don't know of any reliable standard on the
loading order of jars here)
- Endorsed libs
- Server "common " libs
- Server libs themselves
Hope this helps,
Simone
Federico Firpo Bodner wrote:
> Thanks Tahir, but my doubt is: What happens if I put a second jar file
with
> a second aop.xml file? Both configurations are merged? Or each jar keeps
the
> settings in their own aop.xml?
>
> Regards,
> Federico
>
> -----Mensaje original-----
> De: aspectj-users-boun...@eclipse.org
> [mailto:aspectj-users-boun...@eclipse.org] En nombre de Tahir Akhtar
> Enviado el: lunes, 08 de junio de 2009 11:34
> Para: aspectj-users@eclipse.org
> Asunto: Re: [aspectj-users] About aop.xml scope
>
> Hi,
> Here is from my own experience:
> I have a aop.xml in a jar and it is used to weave all the jars in
> WEB-INF/lib and all the classes in WEB-INF/classes.
> When I place the jar containing aop.xml in Tomcat/common/lib it can even
> weave the classes in jars provided by tomcat.
>
> regards,
> Tahir Akhtar
> pilux wrote:
>
>> Hi All,
>>
>> I have a doubt. Settings in aop.xml are scoped only to the classes
>> contained in same jar file, or are exported and merged into whole JVM
>> weaver?
>>
>> Thanks and regards, Federico
>>
>>
>
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--
Simone Gianni CEO Semeru s.r.l. Apache Committer
http://www.simonegianni.it/
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