By Torbjörn Dahlén, Thorbiörn Fritzon
This ebook specializes in integrating J2EE with mainframe purposes. The styles defined within the e-book show the way to encapsulate an integration tier that shields the J2EE parts of an program from the legacy components, so Java purposes can benefit from latest mainframe code.
The publication is going via a real-life instance through describing a banking integration undertaking. 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 ease from having a standard area version around the firm. the typical area version will offer a constant company facts version throughout an company for all clients, so each person within the association could have a standard vocabulary.
If you're a Java developer who's concerned with integrating mainframe program this ebook is a wonderful source to have at the topic. This booklet is a concise and useful consultant to company integration.
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Additional info for Advanced J2EE Platform Development: Applying Integration Tier Patterns
Furthermore, since there is no support for 2-phase commit between the J2EE application and the legacy system, problems might arise if there is a need to roll back the transaction that performed the transfer and the interest calculation. This shows that some transactions are not easy to roll back through simple compensation. 8) illustrates this. 1. , where t0 in this case indicates yesterday's final balance. 2. 00 We define our legacy system's transaction T1 as follows: 1. Withdraw amount X from account A.
If the transaction monitor later calls the rollback method, this compensating transaction is called on the legacy system to achieve the rollback. To continue our previous example, when a Data Access Object requests that the T1 transaction be executed, the Transactional Resource also places the compensating transaction T2 in the queue, to be called in case of a rollback. If an error occurs and a rollback must be performed, the transaction monitor calls the rollback method of the XAResource associated with the current Connection.
The data source does not provide support for distributed transactions. The Data Access Object pattern, in combination with Bean-Managed Persistence (BMP), provides a solution for all of these situations. The next chapter describes this solution in detail. Pitfalls of Caching Persistent Data Because data access is a potential bottleneck in any distributed system, it is tempting to use application data caching to reduce the number of transactions with the resource tier. In a thousands-of-transactions-per-second application, a cache can help significantly by avoiding the trip to the resource tier whenever possible.