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  Tutorial: JMS Enables Concurrent Processing in EJB

JMS provides an elegant solution for overcoming the restrictions you face when developing concurrent applications with EJB. wo major limitations in the Enterprise JavaBeans (EJB) specification make it difficult to develop multi-threaded EJB applications:

Tutorial Details:

Concurrent processing in EJB is a necessity for various applications. For Concurrent processing in EJB is a necessity for various applications. a database containing various commodity prices. Each commodity has more than one price, Assume that identifying a minimum price requires exhaustive calculations, which are implemented by a SessionBean. The SessionBean has a method that accepts a commodity and finds its minimum price.

Now consider a client that has a set of commodities and wants to find a minimum price for each. The client can call the SessionBean by passing one commodity at a time to find its minimum price; in which case it has to call the SessionBean serially for each commodity. Due to the restrictions in EJB, you cannot create threads within the SessionBean that will allow it to accept the commodity in a new thread and return the control back to the client, enabling it to send the next commodity. The only alternative for the client is to create multiple threads outside the SessionBean, so that each thread can call the SessionBean concurrently to find the minimum price for the Commodities.


 

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