model.js

var extend = require('extend');
var _ = require('lodash');
var winston = require('winston');

var model = exports;

model.broadcast = function () {};
model.data = {};

model.apply = function (obj) {
  // TODO: Should check if anything actually changed
  extend(model.data, obj);
  model.broadcast('apply', obj);
}

model.set = function (path_str, value) {
  var path = path_str.split('.');

  var segment, select = model.data;
  while ((segment = path.shift())) {
    if (path.length && select[segment]) {
      select = select[segment];
    } else if (path.length) {
      select = select[segment] = {};
    } else {
      if (_.isEqual(select[segment], value)) return;
      select[segment] = value;
    }
  }

  winston.info("SET", path_str, value);
  model.broadcast('set', [path_str, value]);
}

model.queue = function (name, value, maxEntries) {
  if (!Array.isArray(model.data[name])) {
    model.data[name] = [];
  }

  var queue = model.data[name];

  queue.unshift(value);

  if (queue.length > maxEntries) {
    model.data[name] = queue.slice(0, maxEntries);
  }

  model.broadcast('queue', [name, value, maxEntries]);
};