chrome/browser/resources/sync_internals/chrome_sync.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // require cr.js
   6 // require cr/event_target.js
   7 // require cr/util.js
   8
   9 cr.define('chrome.sync', function() {
  10   'use strict';
  11
  12   /**
  13    * A simple timer to measure elapsed time.
  14    * @constructor
  15    */
  16   function Timer() {
  17     /**
  18      * The time that this Timer was created.
  19      * @type {number}
  20      * @private
  21      * @const
  22      */
  23     this.start_ = Date.now();
  24   }
  25
  26   /**
  27    * @return {number} The elapsed seconds since this Timer was created.
  28    */
  29   Timer.prototype.getElapsedSeconds = function() {
  30     return (Date.now() - this.start_) / 1000;
  31   };
  32
  33   /** @return {!Timer} An object which measures elapsed time. */
  34   var makeTimer = function() {
  35     return new Timer;
  36   };
  37
  38   /**
  39    * @param {string} name The name of the event type.
  40    * @param {!Object} details A collection of event-specific details.
  41    */
  42   var dispatchEvent = function(name, details) {
  43     var e = new Event(name);
  44     e.details = details;
  45     chrome.sync.events.dispatchEvent(e);
  46   };
  47
  48   /**
  49    * Registers to receive a stream of events through
  50    * chrome.sync.dispatchEvent().
  51    */
  52   var registerForEvents = function() {
  53     chrome.send('registerForEvents');
  54   };
  55
  56   /**
  57    * Registers to receive a stream of status counter update events
  58    * chrome.sync.dispatchEvent().
  59    */
  60   var registerForPerTypeCounters = function() {
  61     chrome.send('registerForPerTypeCounters');
  62   }
  63
  64   /**
  65    * Asks the browser to refresh our snapshot of sync state.  Should result
  66    * in an onAboutInfoUpdated event being emitted.
  67    */
  68   var requestUpdatedAboutInfo = function() {
  69     chrome.send('requestUpdatedAboutInfo');
  70   };
  71
  72   /**
  73    * Asks the browser to send us the list of registered types.  Should result
  74    * in an onReceivedListOfTypes event being emitted.
  75    */
  76   var requestListOfTypes = function() {
  77     chrome.send('requestListOfTypes');
  78   };
  79
  80   /**
  81    * Counter to uniquely identify requests while they're in progress.
  82    * Used in the implementation of GetAllNodes.
  83    */
  84   var requestId = 0;
  85
  86   /**
  87    * A map from counter values to asynchronous request callbacks.
  88    * Used in the implementation of GetAllNodes.
  89    * @type {{number: !Function}}
  90    */
  91   var requestCallbacks = {};
  92
  93   /**
  94    * Asks the browser to send us a copy of all existing sync nodes.
  95    * Will eventually invoke the given callback with the results.
  96    *
  97    * @param {function(!Object)} callback The function to call with the response.
  98    */
  99   var getAllNodes = function(callback) {
 100     requestId++;
 101     requestCallbacks[requestId] = callback;
 102     chrome.send('getAllNodes', [requestId]);
 103   };
 104
 105   /**
 106    * Called from C++ with the response to a getAllNodes request.
 107    * @param {number} id The requestId passed in with the request.
 108    * @param {Object} response The response to the request.
 109    */
 110   var getAllNodesCallback = function(id, response) {
 111     requestCallbacks[id](response);
 112     requestCallbacks[id] = undefined;
 113   };
 114
 115   return {
 116     makeTimer: makeTimer,
 117     dispatchEvent: dispatchEvent,
 118     events: new cr.EventTarget(),
 119     getAllNodes: getAllNodes,
 120     getAllNodesCallback: getAllNodesCallback,
 121     registerForEvents: registerForEvents,
 122     registerForPerTypeCounters: registerForPerTypeCounters,
 123     requestUpdatedAboutInfo: requestUpdatedAboutInfo,
 124     requestListOfTypes: requestListOfTypes,
 125   };
 126 });