New PDF release: Advanced J2EE Platform Development: Applying Integration

By Torbjörn Dahlén, Thorbiörn Fritzon

ISBN-10: 0130449121

ISBN-13: 9780130449122

This e-book specializes in integrating J2EE with mainframe purposes. The styles defined within the publication reveal the best way to encapsulate an integration tier that shields the J2EE parts of an software from the legacy parts, so Java purposes can benefit from latest mainframe code.

The booklet 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 on. 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 supply a constant enterprise info version throughout an company for all clients, so everybody within the association may have a typical vocabulary.

If you're a Java developer who's concerned with integrating mainframe software this ebook is a superb source to have at the topic. This ebook is a concise and functional advisor to company integration.

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Extra info for Advanced J2EE Platform Development: Applying Integration Tier Patterns

Example text

PREPARE TO COMMIT: If every update is successful, a PREPARE TO COMMIT is performed on the different data sources, querying them as to whether a COMMIT for this transaction will succeed. If a COMMIT is possible, the data sources acknowledge the PREPARE TO COMMIT. 4. COMMIT or ROLLBACK: If everything have succeeded up to this point, a COMMIT is performed on the data sources, thus acknowledging the updates and making them available to all other users. If anything has failed, a ROLLBACK is immediately performed, voiding any operations that have been performed since the BEGIN statement; any other users can detect no change in the data.

Record transfer in event log of A. 5. 6. 00 transferred to A This example shows that although we are able to restore the original balance on the accounts through running transaction T1 with A and B in reversed positions, the interest calculation goes awry. This is because the new interest is calculated by T1 and not just provided as a value to T1. 1665. Since T1 apparently is an irreversible transaction that can't simply be run "backward," we need to design a proper compensating transaction that is also able to handle the interest calculation.

Recalculate average balance for account B using event log entries between t0 and tN event at time tN 1. 4. Deposit amount x to account A. 5. Look up event at t0 (yesterday's final balance) for account A. 6. Recalculate average balance for account A using event log entries between t0 and tN event at time tN 1. 7. 8. 00 transferred to A This transaction accurately calculates the correct interest by using the event log to recalculate the average balance, omitting the event at t1 that otherwise would cause the interest amount to be incorrect.

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Advanced J2EE Platform Development: Applying Integration Tier Patterns by Torbjörn Dahlén, Thorbiörn Fritzon

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