By Ramnivas Laddad
To permit the production of really modular software program, OOP has developed into aspect-oriented programming. AspectJ is a mature AOP implementation for Java, now built-in with Spring. AspectJ in motion, moment version 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 ways to create reusable options utilizing AspectJ 6 and Spring three. you will grasp key beneficial properties together with annotation-based syntax, load-time weaver, annotation-based crosscutting, and Spring-AspectJ integration. development on popular applied sciences similar to JDBC, Hibernate, JPA, Spring safety, Spring MVC, and Swing, you will observe AOP to universal difficulties encountered in company purposes. This ebook calls for no earlier event in AOP and AspectJ, however it assumes you are accustomed to OOP, Java, and the fundamentals of Spring. "Clear, concisely worded, well-organized ... a excitement to read." -From the Foreword through Rod Johnson, writer of the Spring Framework "This e-book teaches you the way to imagine in elements. it's crucial examining for either newbies who understand not anything approximately AOP and specialists who imagine they are aware of it all." -Andrew Eisenberg, AspectJ improvement instruments undertaking Committer "Ramnivas showcases how you can get the simplest out of AspectJ and Spring." -Andy Clement, AspectJ venture Lead "One of the easiest Java books in years." -Andrew Rhine, software program Engineer, eSecLending "By a ways the easiest reference for Spring AOP and AspectJ." -Paul Benedict, software program Engineer, Argus overall healthiness platforms "Ramnivas expertly demystifies the outstanding energy of aspect-oriented programming." -Craig partitions, writer of Spring in motion
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Extra resources for AspectJ in Action: Enterprise AOP with Spring Applications, 2nd Edition
Chapter 4 focuses on dynamic crosscutting that lets you modify the behavior of the system. It introduces various kinds of advice supported by AspectJ. In this chapter, you’ll begin to implement aspects to deal with fault tolerance and caching functionality. This chapter provides you with enough information to start writing simple AspectJ programs. Chapter 5 focuses on static crosscutting that you can use to modify the structure of the system. It examines mechanisms such as inter-type declarations, weave-time errors and warning declarations, and exception softening.
The language used to specify weaving rules can be a natural extension of that language or something entirely different. For example, an AOP implementation using Java as the base language might introduce new extensions that blend well with the base language, or it could use a separate XML-based language to express weaving rules. 2 The AOP language implementation The AOP language implementation performs two logical steps: It first combines the individual concerns using the weaving rules, and then it converts the resulting information into executable code.
During my consulting engagements, I see signs of AspectJ being in this phase. Developers no longer fear it for its perceived complexity but rather show curiosity about exploring the benefits it offers and eagerly want to use AspectJ. Let’s look at the underlying factors that caused AspectJ to enter this phase. RESPONSE TO USER NEEDS AspectJ followed a path to enlightenment (pardon the pun) by simplifying its adoption. New syntax and weaving models (in part due to merger with AspectWerkz—a project led by Jonas Bonér and Alexandre Vasseur) removed some of the bumpiest patches on the path.