[jboss-as7-dev] Web UI: Profile & host sections mutable?

[Darran Lofthouse]

On 02/14/2011 05:14 PM, David M. Lloyd wrote:
> On 02/14/2011 11:03 AM, Heiko Braun wrote:
>>
>> On Feb 14, 2011, at 5:54 PM, David M. Lloyd wrote:
>>
>>>    I think we should strive to modify our
>>> subsystem/extension architecture such that there are no inter-subsystem
>>> dependencies.
>>
>>
>> Sorry, I had to read your email a second time. Do you really think this will be possible?
>> A typical shared subsystem is the the TransactionManager. How can JCA be left out
>> in a custom profile without including this one?
>
> The way we've solved this in other subsystems is by introducing optional
> dependencies at the service level.  For example if the transaction
> subsystem is configured with an ORB present, we configure JTS, otherwise
> we do not; if OSGi and Txn are both present, then OSGi exposes the Txn
> service.

I wonder how far this can be taken once the deployments come into this, 
those will introduce dependencies on other subsystems that are not 
necessarily needed for all possible deployments.

> I'm not 100% certain we can extend this technique to all cases, but I
> think we should at least try to.  JCA for example would obviously be
> quite crippled without JTA.  So I do not have an answer to that case;
> maybe it suffices to print a warning message in this case.  We should at
> least explore it before we throw out the idea though.