AspectJ in Action: Enterprise AOP with Spring Applications by Ramnivas Laddad

By Ramnivas Laddad

To enable the production of really modular software program, OOP has advanced into aspect-oriented programming. AspectJ is a mature AOP implementation for Java, now built-in with Spring.

AspectJ in motion, moment Edition is a completely up to date, significant revision of Ramnivas Laddad's best-selling first version. it is a hands-on consultant for Java builders. After introducing the center rules of AOP, it indicates you the way to create reusable ideas utilizing AspectJ 6 and Spring three. you are going to grasp key good points together with annotation-based syntax, load-time weaver, annotation-based crosscutting, and Spring-AspectJ integration. development on favourite applied sciences resembling JDBC, Hibernate, JPA, Spring safeguard, Spring MVC, and Swing, you are going to practice AOP to universal difficulties encountered in firm applications.

This e-book calls for no earlier adventure in AOP and AspectJ, however it assumes you are acquainted with OOP, Java, and the fundamentals of Spring.

"Clear, concisely worded, well-organized ... a excitement to read."

-From the Foreword via Rod Johnson, writer of the Spring Framework

"This publication teaches you the way to imagine in points. it truly is crucial examining for either newcomers who be aware of not anything approximately AOP and specialists who imagine they realize it all."

-Andrew Eisenberg, AspectJ improvement instruments venture Committer

"Ramnivas showcases tips to get the easiest out of AspectJ and Spring."

-Andy Clement, AspectJ venture Lead

"One of the simplest Java books in years."

-Andrew Rhine, software program Engineer, eSecLending

"By a long way the easiest reference for Spring AOP and AspectJ."

-Paul Benedict, software program Engineer, Argus well-being Systems

"Ramnivas expertly demystifies the notable energy of aspect-oriented programming."

-Craig partitions, writer of Spring in Action

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Additional resources for AspectJ in Action: Enterprise AOP with Spring Applications

Example text

We’ll discuss how AspectJ can extend dependency injection concepts to domain objects and how to use this possibility of implementing rich behavior in domain objects. We’ll also examine improving business logic through aspects, refactoring using aspects, and implementing certain domain-driven design policies using aspects. Chapter 17 rounds out the book by showing a pragmatic approach to adopting AOP. The first of the three appendixes presents an e-commerce example that is used in the book. The remaining appendixes explain how to use AspectJ with Ant and Maven.

Aspect-oriented programming is one viable solution. In the next section, we’ll introduce you to AOP. Later in this chapter, we’ll examine alternatives to AOP as well. 2 Modularizing with AOP In OOP, the core concerns can be loosely coupled through interfaces, but there is no easy way to do the same for crosscutting concerns. This is because a concern is implemented in two parts: the server-side piece and the client-side piece. OOP modularizes the server part quite well in classes and interfaces.

Although proxy-based AOP lowered the adoption barrier compared to AspectJ’s byte-code based AOP, Spring’s programming model wasn’t inviting. Aspects written using it were type-unsafe and verbose. As a result, most developers limited themselves to the aspects shipped as part of Spring and other frameworks. Spring responded by adopting the AspectJ programming model with a proxy-based implementation. This new possibility lets you use a subset of the AspectJ syntax without the need for a special compiler or weaver.

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