[jboss-as7-dev] System property replacement in deployment descriptors

[Brian Stansberry]

Comments in-line:

On 2/15/12 10:03 AM, Jaikiran Pai wrote:
> Oleg, sorry about the late response.
>
> Currently in AS7 we have xml parsing happening within the AS7 code base
> for the following xmls:
>
> 1) The standalone*.xml/domain*.xml

These files (and host.xml) should be excluded from this effort. They 
have significantly different requirements, primarily related to the need 
to maintain and write back the unresolved value.

> 2) The jboss-deployment-structure.xml
> 3) The jboss-ejb-client.xml
> 4) The jboss-pojo xml
> 5) The jboss-service.xml
>
> and probably a few others. Then we have parsers in other projects
> outside of AS7 codebase which deal with (for example):
>
> 1) The spec specified EE descriptors like ejb-jar.xml, web.xml,
> application.xml
> 2) JBoss specific (EE) deployment descriptors for the deployments like
> jboss-web.xml, jboss-app.xml, jboss-ejb3.xml
>
> These have their own set of parsers.
>
> So obviously trying to _share_ the same system property replacement
> logic utility class, between these projects isn't going to work out. And
> since it's just going to be one since class which is going to parse and
> replace the system property, I think we should just create it in the AS7
> code base and let the parsers in the AS7 code base use that (whichever
> parser wants it). The other projects (like jboss-metadata) can use their
> own (actually we just added one sometime back to support system property
> replacement for "distinct-name" element in the JBoss specific EE
> descriptors).
>
> By the way, the DMR project has a class which handles this property
> replacement (in that project). You might want to borrow that relevant
> code
> https://github.com/jbossas/jboss-dmr/blob/master/src/main/java/org/jboss/dmr/ExpressionValue.java#L110.
>

In a commment on the JIRA I pointed out the old jboss-common-core 
parsing method. But Jaikiran is right to highlight the DMR method as a 
better choice. Scott Stark added logic to it for resolving against the 
VM environment variables (System.getenv()) and not just the system 
properties.

> -Jaikiran
>
> On Friday 10 February 2012 02:31 PM, Oleg Kulikov wrote:
>> Hi Jaikiran,
>>
>> Can you explain more details about your vision of the property
>> replacement task. In general it is interested how deep it should be
>> shared between different substems where xml descriptors are used.
>> Should it be a common parsing utility with description which properies
>> allow expressions or it may be just a simple utility method shared
>> between parsing methods?
>>
>> -- Oleg.
>>
>>
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>
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-- 
Brian Stansberry
Principal Software Engineer
JBoss by Red Hat