[jboss-as7-dev] JBoss Modules: can I dynamically add dependency?

[ssilvert at redhat.com]

On 9/24/2012 8:15 AM, David M. Lloyd wrote:
> Unfortunately this premise is flawed from the start: if you had two 
> apps, each requiring a different JSF implementation, this idea could 
> never work.
I'm not sure what you mean here.  This is already working.
>
> In any case you cannot change the dependencies of a static module at 
> runtime.  Normally when multiple implementations are available you would 
> use reflection to instantiate the implementation you need.  If this is 
> not possible then you'll need a separate module for each implementation 
> type.
That's the problem.  It's not that I need to instantiate something. 
Rather, I need to put jsf-injection in a position where the JSF impl
will find my service and instantiate it.   So the way things are now I
have to statically define a new jsf-injection module for each JSF impl. 
Those modules are exactly the same except for one dependency declaration.

If I could programatically define the module then I wouldn't have to
repeat myself. 

Maybe JBoss Modules was never meant to be used that way?

>
> On 09/24/2012 07:06 AM, ssilvert at redhat.com wrote:
>> I have a module defined like this (currently in master with main and
>> slot="1.2):
>> <module xmlns="urn:jboss:module:1.1" name="org.jboss.as.jsf-injection">
>>      <resources>
>>          <resource-root
>> path="jboss-as-jsf-injection-7.2.0.Alpha1-SNAPSHOT.jar"/>
>>      </resources>
>>
>>      <dependencies>
>>          <module name="com.sun.jsf-impl"/>   <----- this needs to be dynamic
>>          <module name="javax.api"/>
>>          <module name="org.jboss.as.web"/>
>>          <module name="javax.servlet.api"/>
>>      </dependencies>
>> </module>
>>
>> Inside a DeploymentUnitProcessor, the module above is added to the
>> ModuleSpecification along with the module for the selected JSF
>> implementation.  The problem I have is that the JSF Injection code is
>> the same for any Mojarra implementation.  But to support multiple
>> implementations I need to declare a separate jsf-injection module with a
>> hard-coded dependency on each implementation installed.
>>
>> If I could create a module dynamically and dynamically add its
>> dependencies then there would be no need to create more and more modules
>> containing the same jsf-injection jar.
>>
>> I've been looking at the JBoss Modules API and I don't see how to do
>> this.  Is it possible?
>>
>> Stan
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>