Source Code : After Advice Example

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After Advice Example

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/


////////////////////////////////////////////////////////

import java.util.Random;

public class KeyGenerator {

    public static final long WEAK_KEY = 0xFFFFFFF0000000L;
    public static final long STRONG_KEY = 0xACDF03F590AE56L;
    
    public long getKey() {
        Random rand = new Random();
        int x = rand.nextInt(3);
        
        if(x == 1) {
            return WEAK_KEY;
        } else {
            return STRONG_KEY;
        }
    }
}


////////////////////////////////////////////////////////

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class WeakKeyCheckAdvice implements AfterReturningAdvice {

    public void afterReturning(Object returnValue, Method method,
            Object[] args, Object target) throws Throwable {

        if ((target instanceof KeyGenerator)
                && ("getKey".equals(method.getName()))) {
            long key = ((Long) returnValue).longValue();

            if (key == KeyGenerator.WEAK_KEY) {
                throw new SecurityException(
                        "Key Generator generated a weak key. Try again");
            }
        }
    }

}

////////////////////////////////////////////////////////
import org.springframework.aop.framework.ProxyFactory;

public class AfterAdviceExample {

    public static void main(String[] args) {
        KeyGenerator keyGen = getKeyGenerator();
        
        for(int x = 0; x < 10; x++) {
            try {
                long key = keyGen.getKey();
                System.out.println("Key: " + key);
            } catch(SecurityException ex) {
                System.out.println("Weak Key Generated!");
            }
        }
        
    }
    
    private static KeyGenerator getKeyGenerator() {
        
        KeyGenerator target = new KeyGenerator();
        
        ProxyFactory factory = new ProxyFactory();
        factory.setTarget(target);
        factory.addAdvice(new WeakKeyCheckAdvice());
        
        return (KeyGenerator)factory.getProxy();
    }
}

           
       

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