+(defun compile-rule (source-code dependants volatile cl)
+ #'(lambda (obj)
+ `(with-slots ,(append dependants volatile) obj
+ ,@source-code)))
+
+(defun finalize-rules (cl)
+ (let* ((direct-rules (direct-rules cl))
+ (rules '()))
+ (dolist (rule direct-rules)
+ (destructuring-bind (name (&key dependants volatile) &rest source-code)
+ rule
+ (setf dependants (mklist dependants)
+ volatile (mklist volatile))
+ (push
+ (make-instance 'rule :name name :dependants dependants
+ :volatile volatile :source-code source-code
+ :func (compile-rule
+ source-code dependants volatile cl))
+ rules)))
+ (setf (rules cl) (nreverse rules))))
+
+
+(defun fire-class-rules (cl obj slot)
+ "Fire all class rules. Called after a slot is modified."
+ (dolist (rule (direct-rules cl))
+ (cmsg "firing rule: ~a" rule)))
+
+(defmethod (setf slot-value-using-class)
+ :around (new-value (cl hyperobject-class) obj
+ (slot standard-effective-slot-definition))
+ #+ignore
+ (cmsg-c :verbose "Setf slot value: class: ~s, obj: ~s, slot: ~s, value: ~s" cl (class-of obj) slot new-value)
+
+ (let ((func (esd-value-constraint slot)))
+ (cond
+ ((and func (not (funcall func new-value)))
+ (warn "Rejected change to value of slot ~a of object ~a"
+ (slot-definition-name slot) obj)
+ (slot-value obj (slot-definition-name slot)))
+ (t
+ (call-next-method)
+ (fire-class-rules cl obj slot)
+ new-value))))
+
+#+ignore
+(defmethod slot-value-using-class :around ((cl hyperobject-class) obj
+ (slot standard-effective-slot-definition))
+ (let ((value (call-next-method)))
+ (cmsg-c :verbose "slot value: class: ~s, obj: ~s, slot: ~s" cl (class-of obj) slot)
+ value))