Hi JB,
I think that Blueprint already support Stateful service. Here is a
presentation of the mechanism to be used
http://fusesource.com/docs/esb/4.3/esb_deploy_osgi/DeploySimple-Blueprint-Importing.html
A /reference list manager/ instance is created by the blueprint
|reference-list| element. This element returns a list of service
references and is the preferred approach for accessing /stateful/
services. Figure 9.2
<http://fusesource.com/docs/esb/4.3/esb_deploy_osgi/DeploySimple-Blueprint-Importing.html#DeploySimple-Blueprint-Importing-FigLRSS>
shows an overview of the model for accessing a stateful service using
the reference list manager.
Regards,
Charles
On 17/12/10 10:36, Jean-Baptiste Onofré wrote:
Hi David,
thanks for your first feedback.
My purpose is to avoid the usage of JEE, especially the EJBs. I would
like to replace my EJB by pure OSGi bundles, using Aries for JPA and
transactions.
So my question is:
- do we have an equivalent of EJB Session Stateful in OSGi (a kind of
stateful service) ?
- I haven't seen that in the specification (core or compendium) but
maybe it's in the roadmap. If not, don't you think it can be part of
compendium spec ?
- Maybe Apache Aries could provide this kind of module: stateful
service. I guess that the JEE application servers which use OSGi in
background (such as WebSphere 6, WebLogic 10 or Glassfish 3) have
implemented this feature to support EJB Session Stateful. I'm quite
sure that it's a plus value for Apache Aries to provide this kind of
module (we can name it "stateful OSGi services").
WDYT ?
Regards
JB
On 12/17/2010 04:17 AM, David Jencks wrote:
One possibility is to use geronimo 3. It's by no means done or
completely stable but except for web services most javaee 6 stuff is
supported. When you deploy a ee 6 artifact such as an ear it is
transformed into an osgi bundle.
How fine grained are the bundles you want to end up with? Do you
have ideas about how you want the ejbs to be accessed such as through
javaee jndi or as osgi services?
thanks
david jencks
On Dec 16, 2010, at 5:24 AM, Jean-Baptiste Onofré wrote:
Hi all,
I'm migrating a JEE application suite (using EJB Entity, Session,
MDB, JSP, Servlet, etc) to OSGi running on Apache Karaf/Apache
Aries/Apache ServiceMix.
Currently, I have the following architecture
WebContainer
JSP Views -> Servlet Controller
The controller makes a JNDI EJB lookup and RMI-IIOP call to
EJB Container
Facade EJB Session Stateful -> EJB Entities (CMP/BMP)
The Facade is a EJB Session Stateful which is responsible to start
the transaction (Required or RequiresNew) and store some informations.
In the HTTP session, I only store navigation informations, whereas
in the Facade EJB, I store some business information (such as the
user connected, etc).
The HTTP Session contains a handler to the Facade.
I wonder how to refactor the Facade EJB Session Stateful to an OSGi
bundle.
Any help is welcome.
Thanks
Regards
JB
