RE: [aspectj-users] Passing parameters

Ron Bodkin Tue, 17 Oct 2006 12:41:53 -0700

Hi Ed,

You don’t have to bind all parameters with args and you can use wildcards to match parameters (without binding) too, e.g.,

pointcut firstArg(Event e) : args(e, ..); // match the first

pointcut secondArg(Event e) : args(*, e, ..); // second

Also you can use args(e, ..) || args(!Event, e, ..) || args(!Event, !Event, e, ..) to match up to n of them

Informally target(e) matches the object receiving the action (notably the object being called at a call join point or the object owning the filed for field get and set join points). Of course more information about all of this is available in the AspectJ programmer’s guide online or in a good book like AspectJ in Action or Eclipse AspectJ.

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Lauder
Sent: Tuesday, October 17, 2006 10:29 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

That seems to have solved the issue. >From what I see you must know either the first and last param or list all params for the method to join. I assume that you can pass two or more params into the advice?

What does target(e) afford you?

Thanks,

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Bodkin
Sent: Tuesday, October 17, 2006 11:15 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

Try using args(.., e) to match this.

Args matches based on position and number of arguments. Since Event is the last argument, you need to say args(.., e) to match any number of arguments before it then match it last. Unfortunately you can’t say args(.., e, ..) to match an argument anywhere (maybe this will be revised in future).

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Lauder
Sent: Tuesday, October 17, 2006 9:54 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

Please note that the following code compiles does not get woven. If I take the event parameter out, it compiles and gets woven.

The following is the method I want to wrapper with advice:

protected static State processEvent(ClientSession clientSession, State state, Event event)

throws com.ereinsure.commons.exception.PlatformException

{

…

}

ClientSession, State, Event all exist within the same package and I do import those classes.

here is my simplified aspect code:

pointcut callProcessEvent(Event e) :
    call(State processEvent(..)) && args(e);

before(Event event) : callProcessEvent(event)
{
      System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Before call of processEvent aspect");
      System.out.println("Start Time in millis: " + System.currentTimeMillis());
}

after(Event event) returning : callProcessEvent(event)
{
      System.out.println("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< After call of " + event.getName() + " aspect");
      System.out.println("End Time in millis: " + System.currentTimeMillis());
}

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Bodkin
Sent: Tuesday, October 17, 2006 10:34 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

Hi Ed,

Can you give us some example code? Are there any compiler warnings? Did you import the types? What is the signature of the execute method you are hoping to match?

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Lauder
Sent: Tuesday, October 17, 2006 9:29 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

Still cant get it woven.

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Bodden
Sent: Tuesday, October 17, 2006 10:11 AM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

You can use:

pointcut notifyExecute(Event e) :
call(StateTransition execute(..)) && args(e,...);

in that case. (assuming “e” is the first parameter)

Eric

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Lauder
Sent: Tuesday, October 17, 2006 12:01 PM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

I tried that along with target(e). The aspect compiles but does not get woven.

There are three params that get passed into the method execute(). Do all three need to be passed into the notifyExecute pointcut?

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Bodden
Sent: Monday, October 16, 2006 9:04 PM
To: [email protected]
Subject: RE: [aspectj-users] Passing parameters

Try something like…

pointcut notifyExecute(Event e) :
call(StateTransition execute(..)) && args(e);

after(Event event) returning : notifyExecute(event) {
System.out.println("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Call after Execute aspect");
System.out.println("End Time in millis: " + System.currentTimeMillis());

ystem.out.println(“Event was: “+event);
}

Eric

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Lauder
Sent: Monday, October 16, 2006 4:43 PM
To: [email protected]
Subject: [aspectj-users] Passing parameters

I am trying to pass parameters from the point cut into the after advice.

My point cut gets the correct classes that I wish woven. The problem is getting the values passed in to point cut into the advice.

Simply:

pointcut notifyExecute() :
call(StateTransition execute(..));

after() returning : notifyExecute() {
System.out.println("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Call after Execute aspect");
System.out.println("End Time in millis: " + System.currentTimeMillis());
}

There is an Event param that gets passed into the execute method and I would like to get access to the object within the after advice.

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