scientist/lib/scientist.js

Carefully refactor critical paths in production

var EventEmitter, Experiment, Scientist, _,
  extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
  hasProp = {}.hasOwnProperty;

_ = require('underscore');

EventEmitter = require('events').EventEmitter;

Experiment = require('./experiment');

Scientist = (function(superClass) {
  extend(Scientist, superClass);

  function Scientist() {
    this._sampler = _.constant(true);
  }

  Scientist.prototype.sample = function(sampler) {
    return this._sampler = sampler;
  };

  Scientist.prototype.science = function(name, setup) {
    var experiment;
    experiment = new Experiment(name);
    setup(experiment);
    this.emit('experiment', experiment);
    experiment.on('skip', EventEmitter.prototype.emit.bind(this, 'skip'));
    experiment.on('result', EventEmitter.prototype.emit.bind(this, 'result'));
    experiment.on('error', EventEmitter.prototype.emit.bind(this, 'error'));
    return experiment.run(this._sampler);
  };

  return Scientist;

})(EventEmitter);

module.exports = Scientist;