Re: [aspectj-users] initialising instance variables

[Aaron Blishen <aaron_blishen@xxxxxxxxx>]

Hi All,

I have tried to intialise the intance variables in a
constructor (I assumed that one was not needed as some
of the examples in the programming guide do not have
one) i.e:

aspect BoundPoint {
  private PropertyChangeSupport Point.support = new
PropertyChangeSupport(this);

  ....
  
 }
Is this becuase the aspect is adding an instance
variable to the class Point, and adds initialisation
of support into the Point constructor?

Here is my problem when I add a constructor:

public abstract aspect LoggingAspect
{
  // call depth per logger
  protected int callDepth;
  
  // (commons) Log4j logger
  protected Log log;
  
  // class unspecified
  public abstract pointcut cutClass(Object o);
  
  // pointcuts and advice for intercepting constructor
and 
  // method calls based on unspecified class
}

public aspect myClassLogger extends LoggingAspect
{
  // initialise logger and calldepth
  public myClassLogger()
  {
    callDepth = 2;
    log       = LogFactory.getLogger
(myClassLogger.class);
  }
  
  public pointcut cutClass(Object o) : this(o)
    && within(com.foo.myClass);
    
  // custom logging methods for myClass
}

The compiler complains:

inherited abstract pointcut
LoggingAspect.cutClass(java.lang.Object) is not made
concrete in com.foo.myClassLogger

If I make the instance variables static and add a
static constructor to LoggingAspect, it compiles (and
works) fine.

Cheers,

Aaron.

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