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

By Torbjörn Dahlén, Thorbiörn Fritzon

This e-book specializes in integrating J2EE with mainframe functions. The styles defined within the publication reveal tips to encapsulate an integration tier that shields the J2EE parts of an program from the legacy components, so Java purposes can reap the benefits of current mainframe code.

The ebook 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 typical area version around the company. the typical area version will supply a constant company info version throughout an firm for all clients, so everybody within the association could 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 publication is a concise and functional advisor to firm integration.

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2. Calculate average balance for account A. 3. Calculate interest based on average balance of account A. 4. Record transfer in event log of A. 5. Deposit amount X to account B. 6. Calculate average balance for account B. 7. Calculate interest based on average balance of account B. 8. Record transfer in event log of B. 3. 4. 00 transferred from A In order to roll back T1 from a J2EE application where 2-phase commit to the transfer service is not available, a simple compensating effect is achieved by executing T1 again but now with A and B in reversed positions: 1.

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. It is important, however, to be aware of two potential pitfalls in the use of caches in distributed systems: • An application data cache can introduce a single point of failure.

3. 4. 00 transferred from A In order to roll back T1 from a J2EE application where 2-phase commit to the transfer service is not available, a simple compensating effect is achieved by executing T1 again but now with A and B in reversed positions: 1. Withdraw amount X from account B. 2. Calculate average balance for account B. 3. Calculate interest based on average balance of account B. 4. Record transfer in event log of B. 5. Deposit amount X to account A. 6. Calculate average balance for account A.

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