By Matthew D. Groves

AOP in .NET introduces aspect-oriented programming to .NET builders and gives sensible information on the best way to get the main make the most of this method on your daily coding. The books many examples pay attention to modularizing non-functional necessities that regularly sprawl all through object-oriented initiatives. whether youve by no means attempted AOP ahead of, youll have fun with the simple advent utilizing established C#-based examples. AOP instruments for .NET have now reached the extent of useful adulthood Java builders have trusted for a few years, and youll discover the best innovations, PostSharp, and chateau DynamicProxy.

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The following is what the pseudocode might look like with that concern separated using AOP. 6 Pseudocode example with argument checking split out using AOP public class AddressBookService { [CheckForNullArgumentsAspect] Aspect is applied as an attribute. name) } } One new addition to this example is a MethodInformation parameter for OnEntry, which supplies some information about the method so that the arguments can be checked for nulls. Download from Wow! com> What is AOP? 13 I can’t overstate how trivial this example is, but with the code separated (as in the next example), the CheckForNullArgumentsAspect code can be reused on other methods for which you want to ensure that the arguments are valid.

But we’re still not done. We need to talk some more about handling exceptions. 6 Handling exceptions Wait, more exception handling? Wasn’t that first try/catch block enough? Maybe. But if some condition occurs that a retry won’t fix (perhaps a server goes completely offline), then after the retry limit is reached, the exception will be rethrown. And if Download from Wow! com> 36 CHAPTER 2 Acme Car Rental that’s the case, then you’ll need to handle that exception some other way (before it crashes your program).

Our code is clean and separated. It’s easy to read and it’s going to be easy to maintain. This service will get marketing pumped up, and it’s sure to increase your bonus once sales go through the roof. But wait a minute: this code can’t go into production as is. There are all kinds of things that could go wrong that we need to prepare for. Let’s get cracking on those nonfunctional requirements. 3 Add logging Being able to audit loyalty transactions isn’t a requirement (yet), but to be on the safe side, it’s a good idea to log every request, at least for quality assurance (QA) purposes.

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