[jboss-as7-dev] Listening for EJBs appearing / JNDI registrations

[David Bosschaert]

On 18/07/2011 15:52, Brian Stansberry wrote:
> On 7/18/11 3:04 AM, David Bosschaert wrote:
>> Hi,
>>
>> I have a piece of code that needs to kick into action when a particular
>> EJB is registered. What would be the best way to do this? The code is in
>> user-space, it's an OSGi bundle that needs to do something once the EJB
>> is available...
>>
>> So I thought about the following:
>> * register a DeploymentUnitProcessor, however this is a bit heavyweight
>> to ask a EJB/OSGi developer to do...
>> * maybe register an MSC service that waits for an MSC service registered
>> by the EJB to appear? this is also a bit heavyweight and I don't think
>> the MSC services registered by the EJB are documented/part of the public
>> API...
>> * It would be nice if I could simply listen for the JNDI registration...
>> is that possible?
>>
>> As a workaround, I also thought about this:
>> * If I deploy my artifacts in a certain order, will the appserver deploy
>> them again in the same order on a restart?
>>
> It should invoke the management operations to deploy them in the same
> order, yes. However, those management operations install all sorts of
> services, and those services' start() methods are called asynchronously
> with no guaranteed order and no guarantee that everything for deployment
> A is done before deployment B starts. So I doubt a solution based on the
> initial order would be robust.
>
Thanks Brian. I agree that it's not a great idea.

Best regards,

David