By Torbjörn Dahlén, Thorbiörn Fritzon
This e-book specializes in integrating J2EE with mainframe purposes. The styles defined within the ebook show the best way to encapsulate an integration tier that shields the J2EE parts of an program from the legacy components, so Java functions can make the most of present mainframe code.
The booklet is going via a real-life instance by way of 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 convenience from having a standard area version around the firm. the typical area version will supply a constant company facts version throughout an firm for all clients, so every person within the association could have a typical vocabulary.
If you're a Java developer who's concerned with integrating mainframe program this e-book is a superb source to have at the topic. This e-book is a concise and sensible consultant to firm integration.
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Additional resources for Advanced J2EE Platform Development: Applying Integration Tier Patterns
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. Withdraw amount X from account B. 2. Calculate average balance for account B.
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. Note, however, that to meet possible legal requirements for audit logging, the event log is kept intact in order to preserve a record of all account movements, regardless of whether they are rolled back or not. 3 starts a transaction by invoking the J2EE application server's transaction monitor to demarcate the start of the transaction.
Because all this is happening behind the cover of the Data Access Objects, the J2EE application remains unaware of the complex mappings needed to execute as well as to roll back T1. 50 51 Artificial XA Using the J2EE Connector Architecture The J2EE Connector Architecture revolves around two central objects: the Connection and the ManagedConnection. The ManagedConnection represents an actual connection to a legacy system and all the resources associated with it, such as socket connections and so forth.
Advanced J2EE Platform Development: Applying Integration Tier Patterns by Torbjörn Dahlén, Thorbiörn Fritzon