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Re: [aspectj-users] Exception Handling PointsCuts/Advices
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Hi Sudhakar
I get this as a digest so I may have missed something, but I think the
execution pointcut you have done will only match if the exception is
actually listed in the method throws clause.
To get around this you could either add the exceptions to the throws
clause (probably not desirable since they are unchecked exceptions) or
write a pointcut to more specifically pick out the methods that you
actually want to apply the exception handling to.
Regards Chris
Message: 1
Date: Tue, 30 Aug 2005 11:07:28 -0700
From: "Sudhakar Ramakrishnan" <sramakrishnan@xxxxxxxx>
Subject: [aspectj-users] Exception Handling PointsCuts/Advices
To: <aspectj-users@xxxxxxxxxxx>
Message-ID: <54808B311D66EB4E9CF4647B0DE707C2A13D55@xxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="US-ASCII"
How would one go about define pointcuts and advices for something like
this?
Class A throws a number of different types of unchecked exceptions. I
want to define a pointcut that captures these execution join points,
catch the unchecked exception, do some processing with the exception
object, and possibly rethrow the exception as a custom exception. If
anyone has samples for this it would be great.
More details:
Let's say we have
Class A:
public void createAccount(String type) {
if (type.equals("aaa")) {
throw new NullPointerException("aaa");
} else if (type.equals("bbb")) {
throw new BufferOverflowException();
} else if (type.equals("cccc")) {
throw new
MissingResourceException("missing","missing","missing");
}
}
We create Class A objects in Class B.
Class B:
A obj = new A();
Try {
A.createAccount();
} catch (CustomException e) {
// hoping aspectj has rethrow certain unchecked exceptions as
customexceptions
}
Essentially, I want to capture some of those unchecked exceptions and
cast it into a customexception. If there are checked I will convert them
to soft exceptions and convert them if needed.
I am starting with something like this and want some help since I am new
to AspectJ syntax.
public aspect ExceptionHandler {
pointcut customException():
(execution (* *.*(..) throws NullPointerException)
|| execution (* *.*(..) throws BufferOverflowException)
|| execution (* *.*(..) throws
MissingResourceException))
&& within (A);
// I guess I need after throwing
after() : customException() {
//do some processing with the exception object, like logging etc
throw new CustomException();
}
}
-
Sudhakar Ramakrishnan
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