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

By Torbjörn Dahlén, Thorbiörn Fritzon

This publication makes a speciality of integrating J2EE with mainframe purposes. The styles defined within the ebook reveal the right way to encapsulate an integration tier that shields the J2EE parts of an program from the legacy components, so Java functions can reap the benefits of current mainframe code.

The publication is going via a real-life instance by means 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 ease from having a standard area version around the firm. the typical area version will offer a constant company information version throughout an company for all clients, so every body within the association could have a standard vocabulary.

If you're a Java developer who's concerned with integrating mainframe program this booklet is a superb source to have at the topic. This e-book is a concise and functional advisor to firm integration.

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The connector specification also defines factories to be used in creating Connections and Managed Connections. When the application server decides that a data source must be part of a transaction, it examines the deployment descriptor of the connector. If the connector is marked as supporting XA, an XAResource object is checked out from the ManagedConnection via the getXAResource() method. This is usually done when a Connection is checked out from the ConnectionFactory, which is why the connector must implement Connection, ConnectionFactory, ManagedConnection, ManagedConnectionFactory, and XAResource in order to be included in the transaction handling performed by the application server.

In order to handle all update operations within the system, therefore, a classification of each update operation must be made. 9. Update operations classification Class Number and Name Description 1 Supports Distributed Transactions Update operations (for instance on normal relational databases) that support distributed transactions and therefore have no need for artificial XA support. 2 Possible To Compensate Update operations that do not support distributed transactions but can be compensated for with a succeeding update.

One way to achieve this is to forward the ID from the intention log to every Data Access Object involved; each Data Access Object can then use the ID in logging requests for transaction execution. This allows the use of intention logging in read operations as well, which is useful when searching for a system error or bug. 4 Data Merging Because Transfer Objects can consist of data from more than one data source, Data Access Objects should be able to merge data from one or more data sources into a single Transfer Object.

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