AOP wildcard expressions

In the previous post we have seen how to use a advice. But the problem with the example given in the previous post is that, the advice will run for any method which matches the criteria. In other words, the execution criteria given is generic and it is not specific to a particular method. Below are some of the execution criteria's which can be applied to advises.

@Before("execution(public String com.ram.model.Circle.getName())")
 public void LoggingAdvice(){
  ...
 }

The below code is an example of wildcard expression for the advice. It says that the advice should be run for all methods which are public and whose return type could be anything even void and whose method names start with 'get'.

@Before("execution(public * get*())")
 public void LoggingAdvice(){
  ...
 }

The below code is an another example of wildcard expression for the advice. It says that the advice should be run for all methods whose access modifier could be anything, whose return type could be anything, whose name start with 'get' and which will take zero or more parameters. The '..' indicate that the method can take zero or more parameters.

@Before("execution(* get*(..))")
 public void LoggingAdvice(){
  ...
 }