Greetings

greetings.js is a prototypical application for COP containing a multi-lingual implementation of a ‘Hello World!’. Each implementation is presented as an adaptation dynamically selected according to the context (i.e., region of execution) to select the appropriate language.

Program

The program to evaluate is shown in the following

Person = {
  greetings: function() {
   return "Hello!"; 
  }
};

Spanish = new cop.Context(); 

SpanishSpeaking = Trait({ 
 greetings: function() {
  return "Hola!";
 } 
});

French = new cop.Context(); 
FrenchSpeaking = Trait({
 greetings: function() {
  return "Bonjour!"; 
 }
});

Spanish.adapt(Person , SpanishSpeaking);
French.adapt(Person , FrenchSpeaking);

var result = Person.greetings(); 
Spanish.activate();
result = Person.greetings(); 
French.activate();
result = Person.greetings();

There are 2 contexts, Spanish and French to greet in the corresponding language whenever appropriate. The adaptations associated with each context adapts the greetings function.

Precision and Recall

Analysis	Instances	True Positives	False Positives	False Negatives	Precision	Recall
Baseline	3	1	0	2	1	0.33
Whole Program	3	1	0	2	1	0.33
Our	3	3	0	0	1	1

Performance

All times are shown in ms.

Analysis	No. of Nodes	No. of Edges	Processing time	Analysis time
Baseline	116	115	665 ± 25.4	398 ± 10.4
Whole Program	211	214	858 ± 25.5	539 ± 18.6
Our	120	119	727 ± 29.9	321 ± 25.3