By Torbjörn Dahlén, Thorbiörn Fritzon
This booklet specializes in integrating J2EE with mainframe purposes. The styles defined within the publication exhibit easy methods to encapsulate an integration tier that shields the J2EE components of an software from the legacy components, so Java functions can reap the benefits of present mainframe code.
The booklet is going via a real-life instance through describing a banking integration venture. With this instance it describes the typical integration styles, DTO, DAO, neighborhood Transaction Cache, and so on. one of many significant issues the authors make is the convenience from having a typical area version around the company. the typical area version will offer a constant company info 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 publication is a wonderful source to have at the topic. This ebook is a concise and sensible consultant to company integration.
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Extra resources for Advanced J2EE Platform Development: Applying Integration Tier Patterns
The Data Access Object pattern is the key to overcoming this impedance mismatch. However, the mapping from an object-oriented enterprise data model to a legacy system service model is complex, and this complexity is increased by the addition of distributed transactions involving legacy system services that cannot provide two-phase commit functionality to a J2EE application. This issue is addressed in Chapter 3, and techniques for combining Data Access Objects with the J2EE Connector Architecture are presented.
Designing the integration tier for flexibility also requires that logic concerning entities, relationships, and data access is located in the appropriate components. For example, logic concerning a calculation or a constraint based on the attributes of a single entity, such as a Party, could very well be located in a Transfer Object. 30 31 Transfer Objects, however, should never directly access a persistent store or a remote service. If a Transfer Object is to access a persistent store or a remote service directly, it must contain logic that depends on the infrastructure of a particular application, which could make the Transfer Object less reusable in the context of another application running on a different infrastructure.
3. PREPARE TO COMMIT: With this step, the data sources commit to permanently incorporating the updates that were performed. With artificial XA, this commitment is safe because the updates have already been committed. 4. COMMIT: For the artificial XA mechanism this is redundant because the commit has already been performed by the service procedure that executed the update. 5. ROLLBACK: This is where there is a problem. Since commit has already been performed, rolling back the data source is impossible.