Introducing Spring Framework

Chapter 8 ■ Give Advice to Your Spring Application
How will this code interact with your SearchEngine implementation? Well, you only need to declare the
BeforeLoggingModule class (see Listing 8-6) in your XML file, as well as declare a Proxy class (I am going to discuss
this in the next section). Spring will take care of the rest. Next, you will add the beans you need, as shown in Listing 8-7.
Listing 8-7. mydocuments-aop-context.xml
beforeLogging
You added your beforeLogging bean that points to your class where your interface MethodBeforeAdvice is
implemented. Then there is a new bean, engineProxy, that points to the org.springframework.aop.framework.
ProxyFactoryBean class. This class will create a proxy using the JDK reflection. Or you can choose to use a CGLib
(Code Generation Library) that will help to create the necessary code to be in place when the methods are called.
Because here you are using the CGLib, you set the property proxyTargetClass to true. You also defined two more
properties, the target that refers to your SearchEngineService class and the property interceptorNames that has the
value beforeLogging which matches with your bean definition or your advice. This will help the Spring container to
advise all the methods in your SearchEngineService.
If you run the same unit test (see Listing 8-5) using
gradle :ch08:test
you should have the following output:
2014-02-23 20:29:30,119 DEBUG [main] Using Spring AOP:
2014-02-23 20:29:30,152 DEBUG [main] @@@@(BEFORE) Method called: findByType
2014-02-23 20:29:30,152 DEBUG [main] @@@@(BEFORE) Argument passed:Type(name: WEB, description:
Web Link, extension: .url)
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