Video Encoder

video-encoder.js is a example application to demonstrate the interactions and unexpected behavior arising from interacting adaptations.

Program

The program to evaluate is shown in the following

var Trait = require("../traits.js").Trait;
var cop = require("./context-traits.js");

CoreObject = Trait({
  send: function(msg) {
    return msg;
  }
});

Encryption = new cop.Context({
  name: "Encryption"
});


Compression = new cop.Context({
  name: "Compression"
});

EncryptionRole = Trait({
  send: function(msg) {
    return "<E>" + this.proceed(msg) + "<E>";
  }
});

CompressionRole = Trait({
  send: function(msg) {
    return "<C>" + this.proceed(msg) + "<C>";
  }
});

obj = Object.create(Object.prototype, CoreObject);

Compression.adapt(obj, CompressionRole);
Encryption.adapt(obj, EncryptionRole);

Encryption.activate();
Compression.activate();
received_msg = obj.send("message");
Compression.deactivate();
Encryption.deactivate();

Precision and Recall

In this intance, we calculate the points to set over one variable, received_msg with the following result:

//Expected pts = {"message", <E>"message"<E>, <C>"message"<C>, <E><C>"message"<C><E>}
//Baseline
pts(received_msg) = {"message"}  
//Whole program
pts(received_msg) = {"message"} 
//Our
pts(received_msg) = {Unknown} 

Analysis	Instances	True Positives	False Positives	False Negatives	Precision	Recall
Baseline	3	1	0	3	1	0.25
Whole Program	3	1	0	3	1	0.25
Our	3	0	1	4	0	0

Performance

All times are shown in ms.

Analysis	No. of Nodes	No. of Edges	Processing time	Analysis time
Baseline	115	114	647 ± 20.4	372 ± 26.5
Whole Program	213	218	907 ± 39.9	602 ± 24.3
Our	119	118	751 ± 35.8	316 ± 18.4