Introducing Spring Framework

Chapter 8 ■ Give Advice to Your Spring Application
description: Text Notes, extension: .txt), location: /Users/felipeg/Documents/Random/Clustering with
RabbitMQ.txt), Documents(name: Pro Spring Security Book, type: Type(name: WEB, description: Web
Link, extension: .url), location: http://www.apress.com/9781430248187)]
2014-02-23 20:39:40,749 ERROR [main] findByLocation not yet implemented.
The output shows how this advice intercepts the method after it is called, so you can get a hold of the return
value. A different scenario would be to have an audit advice that will trigger an alarm after a special value is returned
by the method intercepted, such as an audit of a bank account that returns a big amount.
Around Advice
This advice, as you may have guessed already, is the combination of the before and after advices, but you can have
more control over it because it will intercept the method call, then you can execute that call and get back a result.
You are executing the after and before advices in one advice. In order to implement this advice, you need to use the
MethodInterceptor interface class (see Listing 8-10).
Listing 8-10. AroundLoggingModule.java
package com.apress.isf.spring.aop;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AroundLoggingModule implements MethodInterceptor {
private static final Logger log = LoggerFactory.getLogger(AroundLoggingModule.class);
public Object invoke(MethodInvocation invocation) throws Throwable {
Object result = null;
if(log.isDebugEnabled()){
log.debug("@@@@(AROUND-BEFORE) Method called: " +
invocation.getMethod().getName());
if(invocation.getArguments().length ==0 )
log.debug("@@@@(AROUND-BEFORE) No arguments passed.");
for(Object arg:invocation.getArguments())
log.debug("@@@@(AROUND-BEFORE) Argument passed:" + arg);
}
try{
if(log.isDebugEnabled())
log.debug("@@@(AROUND) Processing...");
result = invocation.proceed();
if(log.isDebugEnabled())
log.debug("@@@(AROUND-AFTER) Result: " + result);
return result;
}catch(IllegalArgumentException ex){
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