Will EJB help Scalablity, Availiblity and Preformance with/instead of JDO?

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Will EJB help Scalablity, Availiblity and Preformance with/instead of JDO?

Will EJB help Scalablity, Availiblity and Preformance with/instead of JDO?

2003-12-08 - By Graham Cruickshanks

Back
Hi,

I'm looking for some experienced Peer J2EE architect advice.

I've about 35 fined grained JDO objects, These map to the row level in
each row of my database. There is about 6 different object graphs that
represent larger entities.

>From looking through best practices with EJB entity beans, It recommends
that Entity Bean should be Coarse Grained Objects and to use the
'Composite View' design pattern. The Composite View pattern uses
database access object I.e. JDO.

My application preformance and scalablity are untested at the moment but
I know it needs to support between 1000 and 3000 clients concurrently
polling to see if they have any notification about once every 20 seconds
via a webservice. Also Interactions of about 1 a minute will be sent to
the server for processing. These interactions are processed
asyncronessly.

Currently the architect is: (High Abtraction)

Interactions Interface:

httplistener -> Axis -> message queue (JMS)-> processor selection (java
obj) -> process (java obj) -> entitymodel (jdo) -> database

Notification Interface:

httplistener -> Axis -> message queue (JMS)

So here is my question.

If I convert my app by extended its architect to include EJB objects
like so

Httplistener -> Axis -> message queue -> business deligate (Plus service
locator) -> processor selection (stateless-sessionbean) -> process
(stateless-sessionbean) -> session fa�ade (stateless-sessionbean) ->
entitymodel (Coarse Grained Entity EJB with composite pattern JDO) ->
database

Q1: From experience, how will this affect non-functional requirements:

Scalablity, Availiabity, Preformance and Security?

Q2: I'll a little confused on how by adding so many more object
instances, I will increase scalablity and preformance from the J2EE
containers object life cycle handlers (passivation,activation). I.e.
When using the 'Composite View' pattern it seems like I'm just adding
an EJB for EJB sake. Can someone clarify or confirm that there is (no?)
benefits in practice.

Kind Regards

Graham Cruickshanks

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