By Torbjörn Dahlén, Thorbiörn Fritzon
This booklet makes a speciality of integrating J2EE with mainframe purposes. The styles defined within the ebook exhibit find out how to encapsulate an integration tier that shields the J2EE parts of an program from the legacy parts, so Java purposes can benefit from latest mainframe code.
The publication is going via a real-life instance through 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 ease from having a typical area version around the firm. the typical area version will offer a constant company information version throughout an firm for all clients, so everybody within the association could have a standard 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 functional advisor to firm integration.
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Extra info for Advanced J2EE Platform Development: Applying Integration Tier Patterns
Due to the sheer volume of the entries, the resulting log would be difficult to search for the entries that could provide information about the failure. To make it possible to determine the intention with each update, the J2EE application should use an intention log to record the needed information for every operation, which could be done, for example, in the beginning of a transaction scope. When searching for errors or bugs in the system, it is useful to be able to trace all associations between operations.
As explained later in this chapter, an interaction with a mainframe is usually initiated by sending a message to a transaction queue. The message is then handled by a program that processes the data it contains, and another message containing output data is returned. The instance of one message sent to a specific program constitutes one transaction. Over time, the term transaction also came to refer to the discrete program that handles a specific task with a specific type of message. The use of the alternative terms service or service procedure to indicate the program or procedure helps to avoid confusion between the transaction itself and the program involved.
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.
Advanced J2EE Platform Development: Applying Integration Tier Patterns by Torbjörn Dahlén, Thorbiörn Fritzon