Notification support

Without any intervention of the developper, PAMELA framework offers a fine-tuned notification support. This notification scheme relies on the execution of write-access ModelProperties (properties using set:, add:, add:AtIndex:, remove:, delete: and undelete: protocols). Since the execution of ModelProperty-related methods is performed by embedded PAMELA interpreter, a default notification scheme is executed.

Default implementation relies on java.beans.PropertyChangeSupport API (the AccessibleProxyObject API provided in PAMELA framework extends HasPropertyChangeSupport Java interface which exposes getPropertyChangeSupport() method). Default implementation of notification scheme propagates a PropertyChangeEvent for each property changing its value, with the former and the new value.

The developper is responsible for the custom implementations which might be defined in its model. The use performSuperSetter(String,Object), performSuperAdder(String,Object) or performSuperRemover(String,Object) may be usefull in the context of property custom redefinition.

An interesting point is that this notification scheme may be easily extended by defining a new PropertyImplementation (see section on meta-programming). The developper does not have to redefine it for all properties, since all required properties should define a @PropertyImplementation annotation.