Re: Messaging Bean

[Sanjeev Verma]

Normally speaking, I try to link EJBs with two advantages: 1. Scability - pooling is a big asset, and this is managed by the container. 2. Transcation - since you are talking about "Billions of rows of data", this would be important to you, and it makes more sense to exploit the declarative transaction management that comes along with EJBs. I would not know much about the cluster setup/management in weblogic, but reading the scenario you have described, it should not be a problem. I woul suggest you read the weblogic docs for details on this. So coming back to "what do we loose". Well, we loose both the above services, besides others that i have not even mentioned. So if you want to do pooling, you will need to implement your own pooling logic, which will be like re inventing the wheel. And even more tricky will be transaction management. And since you will be using the container for deploying MDBs anyways, it makes sense to use Stateless Session beans since the infrastructure is already there. Another important thing you may want to consider at the design stage is creating caches, such that every time data is needed, its not a trip to the DB - this is a costly operation and if avoided thru' caching, can result in major improvements. Invest time in learning some time tested patterns used in J2EE development in the caching area. Hope this helps. Best Regards Sanjeev Sachin Tandon wrote: Hi  We are using Messaging Beans on our project. The message bean in turn will be calling different java classes for performing some actions. The java classes will be having business logic and will access the DB. We will process billions of records. I wanted to decide on using EJBs against normal java classes in this scenario. 1)Billions of rows of data to be processed 2)Lots of calculation involved in processing data 3)Weblogic clustering Ã?? need to load balance requests received by MDB across instances. Any thoughts? What do we loose when we use normal java classes in this scenario as against using session beans Thanks =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff EJB-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".   --  Best Regards Sanjeev Verma Sun ONE App Server Migration Consultant Web Services, Tools and Migration Tools Market Development Engineering =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff EJB-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".