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

By Ramnivas Laddad

A consultant to aspect-oriented programming and the AspectJ language, this booklet presents code examples that allow quickly implementation of performance in a method. Thorough introductions to AOP and AspectJ may help builders research or enhance their wisdom of AspectJ. Examples of daily occasions within which AspectJ options might be utilized, resembling logging, coverage enforcement, source pooling, enterprise good judgment, thread-safety, authentication and authorization, and transaction administration are supplied. moreover, layout styles and idioms are lined, as is enterprise rule implementation. the newest applied sciences, reminiscent of JEES, JAAS, and log4j, are defined and hooked up with AspectJ.

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Ensure authorization ... Ensure info satisfies contracts ... Lock the object to ensure thread-safety ... Ensure cache is up-to-date ... Log the start of operation ... Perform the core operation ... Log the completion of operation ... Unlock the object c Invocation of peripheral services Implementing crosscutting concerns 15 } ... More operations similar to above addressing multiple concerns public void save() { ... } public void load() { ...

AOP merely provides new ways to solve problems in areas where procedural and OOP naturally fall short. In fact, AOP requires 30 CHAPTER 1 Introduction to AOP ■ ■ ■ ■ a good design of core concerns and makes it easy to achieve an overall clean design goal. AOP is nice, but a nice abstract OOP interface is all you need: False. This issue stems from the problem with the way crosscutting concerns are implemented using OOP. The technique in OOP is to use an abstract API and swap implementations underneath without the need to modify the clients of the API.

More operations similar to above ... Each public operation will be similarly ... woven in with log statements Rule 3—logging the completion of the operation Woven in automatically } You can now see that the woven code contains the calls to the log() method as was prescribed by the weaving rules. Similarly, you can take care of the remaining crosscutting concerns by having an implementation for each of them, and weaving rules to specify the interaction between the individual concerns. Because multiple crosscutting concerns are affecting a module, you will also have to specify the order in which the concerns should be woven.

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