Thinker.java
package springdemo2;
public interface Thinker {
void thinkOfSomething(String thoughts);
}
Volunteer.java
package springdemo2;
public class Volunteer implements Thinker{
private String thoughts;
@Override
public void thinkOfSomething(String thoughts) {
this.thoughts=thoughts;
}
public String getThoughts(){
return thoughts;
}
}
MindReader.java
package springdemo2;
public interface MindReader {
void interceptThoughts(String thoughts);
String getThoughts();
}
Magician.java
package springdemo2;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
public class Magician implements MindReader {
private String thoughts;
@Pointcut("execution(* springdemo2."
+ "Thinker.thinkOfSomething(String)) and args(thoughts)")
public void thinking(String thoughts){
}
@Override
@Before("thinking(thoughts)")
public void interceptThoughts(String thoughts) {
this.thoughts=thoughts;
System.out.println("Advice method intercepted Thoughts..."+thoughts);
}
@Override
public String getThoughts() {
return thoughts;
}
}
XML(Spring)
I have included <aop:aspectj-autoproxy/>
in my XML file.
I got following Error Message
java.lang.IllegalArgumentException: error at ::0 formal unbound in
pointcut
In Spring AOP, a join point always represents a method execution. A pointcut is a predicate that matches the join points, and the pointcut expression language is a way of describing pointcuts programmatically.
Spring offers fully typed advice - meaning that you declare the parameters you need in the advice signature (as we saw for the returning and throwing examples above) rather than work with Object[] arrays all the time.
AOP (Aspect-Oriented Programming) is a programming pattern that increases modularity by allowing the separation of the cross-cutting concern. These cross-cutting concerns are different from the main business logic. We can add additional behavior to existing code without modification of the code itself.
We can use @Before annotation to mark an advice type as Before advice. After (finally) Advice: An advice that gets executed after the join point method finishes executing, whether normally or by throwing an exception. We can create after advice using @After annotation.
@Pointcut("execution(* springdemo2."
+ "Thinker.thinkOfSomething(String)) and args(thoughts)")
should be
@Pointcut("execution(* springdemo2."
+ "Thinker.thinkOfSomething()) && args(thoughts)")
@Before("thinking(thoughts)")
should be
@Before("thinking(String) && args(thoughts)")
Don't use "and" operator to link aspect designators. In Java you can use the "&&" operator. "and" is only available in XML.
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