[wildfly-dev] EE level java:comp/DefaultDataSource for WildFly 8...
Stuart Douglas
stuart.w.douglas at gmail.com
Tue Sep 24 10:41:07 EDT 2013
I think option 1, enhance the naming subsystem bindings. I think it would be confusing to have two different places to define bindings.
Sent from my iPhone
On 24/09/2013, at 15:12, "David M. Lloyd" <david.lloyd at redhat.com> wrote:
> On 09/24/2013 05:14 AM, Eduardo Martins wrote:
>> Maybe we should create a doc with a reference design, since there are several default EE resources among our subsystems...
>>
>> IMHO default EE resources should be defined in the related subsystem configuration, otherwise the EE subsystem config will always be changing. In this case there should a configuration in the Datasources subsystem such as:
>>
>> <subsystem xmlns="urn:jboss:domain:datasources:2.0">
>> <datasources>
>> <default-datasource jndi-name="java:jboss/datasources/ExampleDS" />
>> <datasource jndi-name="java:jboss/datasources/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">
>> ...
>> </datasource>
>> ...
>> </datasources>
>> </subsystem>
>>
>> For an easier/faster logic to find the default resource, and since we don't officially support linkref on jndi, the subsystem management op that adds the default resource (in this case default-datasource) should create a binder service pointing to a *fixed* jndi name (let's says java:jboss/ee/default/datasource) and inject it with the target resource (in this case the jndi name java:jboss/datasources/ExampleDS).
>>
>> Then the subsystem should provide a DUP that for EE modules do the required default bindings, in this case java:comp/DefaultDataSource and/or java:module/DefaultDataSource
>>
>> The subsystem then also needs to take care of the default mapping to the *fixed* jndi name from @Resource injection, this can be accomplished by adding a EEResourceReferenceProcessor to the EEResourceReferenceProcessorRegistry present in DU attachment with key org.jboss.as.ee.component.Attachments.RESOURCE_REFERENCE_PROCESSOR_REGISTRY
>
> I don't know, I guess I'm running out of opinion on this.
>
> Here's a list of options:
>
> 1) Enhance naming subsystem to be able to bind java:comp, java:module,
> java:app names, and put config in that subsystem (modify JMS and other
> subsystems with implicit bindings to do the same)
> 2) Enhance datasources subsystem to include a default datasource
> attribute (== XML element) which, when present, will set up implicit
> bindings for java:comp (and make sure that the config looks/acts
> similarly between JMS, DS, and any other subsystem with implicit bindings)
> 3) Decide it's all the EE subsystem and put implicit bindings in there
>
> Decision time: GO!
> --
> - DML
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