Get AspectJ in action : practical aspect-oriented programming PDF

By Ramnivas Laddad

ISBN-10: 1930110936

ISBN-13: 9781930110939

A advisor to aspect-oriented programming and the AspectJ language, this ebook presents code examples that let fast implementation of performance in a procedure. Thorough introductions to AOP and AspectJ might help builders research or improve their wisdom of AspectJ. Examples of daily events during which AspectJ recommendations may be utilized, resembling logging, coverage enforcement, source pooling, enterprise common sense, thread-safety, authentication and authorization, and transaction administration are supplied. additionally, layout styles and idioms are lined, as is company rule implementation. the most recent applied sciences, equivalent to JEES, JAAS, and log4j, are defined and hooked up with AspectJ.

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AOP is a new methodology that provides separation of crosscutting concerns by introducing a new unit of modularization—an aspect—that crosscuts other modules. With AOP you implement crosscutting concerns in aspects instead of fusing them in the core modules. An aspect weaver, which is a compiler-like entity, composes the final system by combining the core and crosscutting modules through a process called weaving. The result is that AOP modularizes the crosscutting concerns in a clear-cut fashion, yielding a system architecture that is easier to design, implement, and maintain.

This is where AOP comes into the picture. Using AOP, none of the core modules will contain calls to logging services—they don’t even need to be aware of the presence of logging in the system. 5. The logging logic now resides inside the logging module and logging aspect; clients no longer contain any code for logging. The crosscutting logging requirements are now mapped directly to just one module—the logging aspect. With such modularization, any changes to the crosscutting logging requirements affect only the logging aspect, isolating the clients completely.

This view portrays a system as a composition of multiple concerns that become tangled together by the current implementation techniques; therefore the independence of concerns cannot be maintained. 1 Viewing a system as a composition of multiple concerns. Each implementation module addresses some element from each of the concerns the system needs to address. 1 Identifying system concerns By identifying the core and crosscutting concerns of a system, we can focus on each individual concern separately and reduce the overall complexity of design and implementation.

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AspectJ in action : practical aspect-oriented programming by Ramnivas Laddad

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