[jboss-dev-forums] [JBoss AS 7 Development] - [Proposal] Resolve expression values on system properties

[Guillaume Grossetie]

Guillaume Grossetie [https://community.jboss.org/people/grossetieg] created the discussion

"[Proposal] Resolve expression values on system properties"

To view the discussion, visit: https://community.jboss.org/message/759709#759709

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Hi,

The StringPropertyReplacer class already provide a method #replaceProperties that replace ${expression} value with system properties. I think that it can be useful to resolve expression on system properties with system properties.

Example :
    <system-properties>
        <property name="my.image.dir" value="${jboss.server.data.dir}/image"/>
    </system-properties>


Sure I can do the work on my code but I don't want to reference jboss system property :
    <system-properties>
        <property name="my.image.dir" value="image"/>
    </system-properties>
 
System.getProperty("jboss.server.data.dir") + "/" + System.getProperty("my.image.dir");


If we use StringPropertyReplacer we can also do sometthing like :
    <system-properties>
        <property name="my.dir" value="/my/dir"/>
        <property name="my.image.dir" value="${my.dir:/home}/image"/>
    </system-properties>


The basic idea is to check if the added/removed/changed system property resolve expression :
setSystemProperty("my.image.dir", "${jboss.server.data.dir}/image");
# my.image.dir = "${jboss.server.data.dir}/image"
 
setSystemProperty("jboss.server.data.dir", "/opt/jboss");
# retrieve my.image.dir property, resolve expression and setSystemProperty("my.image.dir", "/opt/jboss/image");
# my.image.dir = /opt/jboss/image


The resolved expression will not be stored on the standalone.xml/domain.xml file.

What do you think ?

Guillaume.
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