Re: [aspectj-users] How to inject a static field into a multitude of typ

[Mark <mark.kharitonov@xxxxxxxxx>]

I have implemented this approach, but I have a problem with inheritance. 

Please, observe:
===========================================================
public abstract aspect LoggerAspect {
  private static aspect LoggerHolderAspect pertypewithin(@LogMe *) {
    private Logger logger;
    public void initLogger() { logger =
LogManager.getLogger(getWithinTypeName()); }
    public Logger getLogger() { return logger; }
  }

  private interface ILoggable {};
  declare parents: (@LogMe *) implements ILoggable;
  
  //
----------------------------------------------------------------------------------------
  // These declarations are never used by the aspect itself. They are for
the subject classes.
  public Logger ILoggable.getLogger() { return
LoggerAspect.getLogger(this.getClass()); }
  public static Logger getLogger(@SuppressWarnings("rawtypes") Class clazz)
{ return LoggerHolderAspect.aspectOf(clazz).getLogger(); }
  //
----------------------------------------------------------------------------------------

  private static Logger getLogger(JoinPoint.StaticPart jp) { return
getLoggerHolder(jp).getLogger(); }
  private static LoggerHolderAspect getLoggerHolder(JoinPoint.StaticPart jp)
{ return  LoggerHolderAspect.aspectOf(jp.getSignature().getDeclaringType());
}
  
  before(): staticinitialization(@LogMe *) {
getLoggerHolder(thisJoinPointStaticPart).initLogger(); }
  ...
}
===========================================================

Now, I have two subject classes forming a hierarchy:
===========================================================
@LogMe
public class BaseDummyInterceptor implements IDummyInterceptor {
  @Override
  public void Intercept(JoinPoint jp) {
getLogger().trace("BaseDummyInterceptor: " + jp); }
}
===========================================================
@LogMe
public class DummyInterceptor extends BaseDummyInterceptor {
  @Override
  public void Intercept(JoinPoint jp) { getLogger().trace("DummyInterceptor:
" + jp); super.Intercept(jp); }
}
===========================================================

Eclipse reports two markers for the DummyInterceptor, one of which is an
error:
===========================================================
Multiple markers at this line
	- The hierarchy of the type DummyInterceptor is 
	 inconsistent
	- advised by LoggerAspect.before(): <anonymous 
	 pointcut>
===========================================================

Interestingly enough, the error marker does not appear in the Problems view
and does not prevent the code from compiling and running.

Anyway, when I run the application, I get a log like this:
===========================================================
2011-12-18 14:57:05,276 null[Dispatcher-0] DEBUG
com.shunra.poc.handlers.UserHandler - getUser(id: 1)
2011-12-18 14:57:05,279 null[Dispatcher-0] DEBUG com.shunra.poc.UserService
- get(id: 1)
2011-12-18 14:57:05,280 null[Dispatcher-0] TRACE
com.shunra.poc.dummy.DummyInterceptor - DummyInterceptor: execution(User
com.shunra.poc.InMemoryUserRepository.fetch(int))
2011-12-18 14:57:05,281 null[Dispatcher-0] TRACE
com.shunra.poc.dummy.DummyInterceptor - BaseDummyInterceptor: execution(User
com.shunra.poc.InMemoryUserRepository.fetch(int))
2011-12-18 14:57:05,281 null[Dispatcher-0] TRACE com.shunra.poc.UserService
- get(id: 1) = User [Id=1, FirstName=Mark, LastName=Kharitonov, Age=36]
2011-12-18 14:57:05,282 null[Dispatcher-0] TRACE
com.shunra.poc.handlers.UserHandler - getUser(id: 1) = User [Id=1,
FirstName=Mark, LastName=Kharitonov, Age=36]
===========================================================

Notice two messages from the com.shunra.poc.dummy.DummyInterceptor logger -
one for DummyInterceptor and the other - for BaseDummyInterceptor, invoked
though the super reference from within the DummyInterceptor.Intercept
method.

The problem is that ILoggable.getLogger method retrieves the
LoggerHolderAspect instance using  this.getClass() as the key, which is
determined polymorphically, while I need a statically determined value.

How do I fix it?

Thank you very much in advance.

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