By Torbjörn Dahlén, Thorbiörn Fritzon
This publication specializes in integrating J2EE with mainframe functions. The styles defined within the publication reveal how one can encapsulate an integration tier that shields the J2EE components of an software from the legacy components, so Java functions can make the most of present mainframe code.
The publication is going via a real-life instance by way of describing a banking integration venture. With this instance it describes the typical integration styles, DTO, DAO, neighborhood Transaction Cache, and so forth. one of many significant issues the authors make is the convenience from having a standard area version around the company. the typical area version will offer a constant company information version throughout an company for all clients, so all people within the association may have a typical vocabulary.
If you're a Java developer who's concerned with integrating mainframe software this booklet is a wonderful source to have at the topic. This ebook is a concise and sensible advisor to company integration.
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Extra info for Advanced J2EE Platform Development: Applying Integration Tier Patterns
The transaction is initiated and terminated by a session or entity bean using Bean Managed Persistence. • The Data Access Object method operates only on persistent stores that are managed by a single, non-J2EE transaction monitor. In this case, the transaction monitor coordinates distribution of the transactions to all persistent stores involved. The Data Access Object must use single wrapper transactions to update the persistent stores. The session or entity bean is not involved in the transaction initiation or termination.
Before the legacy system service is called, data from the multiple Transfer Objects that are needed by a legacy system service are accumulated in the queue. Hence, multiple Data Access Objects can participate in calling a single legacy system transaction that requires data contained in several different Transfer Objects. In order to support compensating transactions, the Pending Transaction Queue must, in addition to storing the InteractionSpec and input and output records of the normal legacy system service transaction, also store these objects for each compensating transaction that corresponds to that normal transaction.
Then a new arrangement entry is added to the arrangement table. Following that, an entry is added to the arrangement per account table, and finally the product list associated with the account is updated. All this is done in one procedure call and the procedure commits all the updates to the database at the very end of the procedure text, which effectively blocks any reasonable possibility of adding support for distributed transactions without re-writing every transaction procedure. Of course, this represents the real problem.
Advanced J2EE Platform Development: Applying Integration Tier Patterns by Torbjörn Dahlén, Thorbiörn Fritzon