Spring AOP pointcut differentiated by arguements

Question

I have two public methods in same class with same return type, only different is the argument it takes. I want to have a pointcut apply on only one of it.

Here is the example of the class:

public class HahaService{ public MyObject sayHaha(User user){ //do something } public MyObject sayHaha(Long id, User user){ //do something } }

Now I want to have a pointcut only apply on the 2nd sayHaha method which takes two arguments: a Long id and a User user.

I currently have a @Pointcut

@Pointcut("execution(public MyObject com.abc.service.HahaService.sayHaha(..))") private void hahaPointCut() { }

This pointcut is applied on both sayHaha method.

Is there a way I can do it only on the 2nd one?

Sotirios Delimanolis · Accepted Answer · 2016-05-20 01:41:06Z

Yes, just restrict your pointcut expression to methods that have specific parameter types.

Get rid of the .. and specify the parameter types

@Pointcut("execution(public MyObject com.example.HahaService.sayHaha(Long, com.example.User))")

Alternatively, if you actually need the value of the arguments, you can use name binding to capture them. For example, your pointcut would be declared as

@Pointcut("execution(public MyObject com.example.HahaService.sayHaha(..)) && args(id, user)") private void hahaPointCut(Long id, User user) { }

and the advice, for example a @Before, would be declared as (repeating the names)

@Before("hahaPointCut(id, user) ") public void before(Long id, User user) { /* execute advice */ }

Now Spring AOP can determine the types of the parameters by the match between the parameters in the pointcut and the names used in args. It then matches those in @Before and binds to corresponding invocation arguments.

This technique is described in the chapter on Passing parameters to advice.

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