Zetta LED state machine that changes at runtime.

led.js

var util = require('util');
var Device = require('zetta').Device;

var LED = module.exports = function() {
  Device.call(this);

  this.intensity = 0;

  var self = this;

  // Example of dynamically changing state machine at runtime.
  // Measures would have to be taken to ensure these changes are
  // loaded at init time after the changes have been made
  // dynamically.
  setTimeout(function() {
    self._allowed['on'] = ['turn-off', 'dim'];
    self._allowed['dimmed'] = ['turn-on', 'turn-off'];
    self._transitions['dim'] = {
      handler: function(intensity, cb) {
        intensity = new Number(intensity);
        if (!intensity || isNaN(intensity)) {
          this.call('turn-off', cb);
          return;
        }

        this.intensity = intensity;
        this.state = 'dimmed';
        cb();
      },
      fields: [ { name: 'intensity', type: 'text' } ]
    }
  }, 5000);
};
util.inherits(LED, Device);

LED.prototype.init = function(config) {
  config
    .type('led')
    .state('off')
    .when('off', { allow: ['turn-on'] })
    .when('on', { allow: ['turn-off'] })
    .map('turn-on', this.turnOn)
    .map('turn-off', this.turnOff)
};

LED.prototype.turnOn = function(cb) {
  this.intensity = 100;
  this.state = 'on';
  cb();
};

LED.prototype.turnOff = function(cb) {
  this.intensity = 0;
  this.state = 'off';
  cb();
};