Get EJB design patterns : advanced patterns, processes, and PDF

By Floyd Marinescu

Loads of programming includes fixing an identical types of easy difficulties. good, what if a neighborhood of specialists bought jointly and pooled their wisdom to return up with the easiest programming practices for fixing those difficulties? you will have what are referred to as layout patterns.
writer Floyd Marinescu, a number one professional on EJB, labored with the contributors of the EJB group of to place their collective wisdom jointly to construct a library of layout styles, options, and most sensible practices for EJB layout and improvement. This treasure-trove of confirmed top practices will permit builders to fast resolve tricky programming assignments. in contrast to different styles books, this booklet is going past high-level designs to the particular code for enforcing them, saving builders numerous hours of effort and time while development scalable, trustworthy, and maintainable EJB platforms.

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In this example, the client calls an executeCommand method on the routing logic component. In IBM’s Command framework, the client only needs to call execute on the command itself, since the method call will actually be received by the superclass of the command, which is part of the routing logic framework. 9 since it is part of the routing logic), which is encoded with knowledge of EJB and knows how to send the command to the CommandServer stateless session bean. Upon receiving the command, the CommandServer simply calls the execute method on the command, which then goes about its business logic.

Using the Session Façade pattern, session beans would be created to group use cases with similar functions into one bean. Thus we can add other ancillary banking operations to the Bank Teller (such as withdrawFunds, depositFunds, getBalance()). Elsewhere in the banking application, use cases for different purposes would also be grouped into a session bean. For example, every bank has a Loans Department. The use cases required to model the operations of a Loans Department are not that related to the use cases on a Bank Teller; therefore, they would be grouped into a LoanServices session bean.

That is, if the transaction fails at any point (perhaps the airlines’s systems go down or some other system failure occurs), the transaction will be rolled back and the JMS message will be put back in the queue. The transaction will then be retried later, without the knowledge of the client. This behind-the-scenes behavior also presents a problem. How is the client to be notified if the use case fails or succeeds? For example, if a seat cannot be reserved because the plane is fully booked, the client needs to be notified.

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