package be.ac.vub.object_annotations.examples.blackboard.aspect;

import java.lang.annotation.Annotation;

import be.ac.vub.object_annotations.AnnotationManager;
import be.ac.vub.object_annotations.MutableAnnotation;
import be.ac.vub.object_annotations.examples.blackboard.Blackboard;
import be.ac.vub.object_annotations.examples.blackboard.annotations.Lock;


public aspect Guardian {
	
	pointcut published(Object o) : execution(* Blackboard.publish(Object)) && args(o);
	
	pointcut retracted(Object o) : execution(* Blackboard.retract(Object)) && args(o);
	
	after(Object o): retracted(o){
		Lock lock = AnnotationManager.getAnnotationOf(o);
		((MutableAnnotation)lock).change("value", false);
	}
	
	
	after(Object o) : published(o) {
		Lock lock = AnnotationManager.activate(o, Lock.class);
		((MutableAnnotation)lock).change("value", true);
	}
	
	
	pointcut propagateTo(Object from) : get(* *) && target(from)  && if(AnnotationManager.isActive(from,Lock.class));
	
	after(Object from) returning(Object to): propagateTo(from){
		Annotation a = AnnotationManager.getAnnotationOf(from);
		AnnotationManager.activate(to, a);
	}

}