gecko-dev/dom/ipc/preload.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

// Preload some things, in an attempt to make app startup faster.
//
// This script is run when the preallocated process starts.  It is injected as
// a frame script.

var BrowserElementIsPreloaded = true;

var DoPreloadPostfork = function(aCallback) {
  Services.obs.addObserver({
    _callback: aCallback,

    observe: function() {
      this._callback();
      Services.obs.removeObserver(this, "preload-postfork");
    }
  }, "preload-postfork", false);
};

(function (global) {
  "use strict";

  let Cu = Components.utils;
  let Cc = Components.classes;
  let Ci = Components.interfaces;

  Cu.import("resource://gre/modules/AppsUtils.jsm");
  Cu.import("resource://gre/modules/BrowserElementPromptService.jsm");
  Cu.import("resource://gre/modules/DOMRequestHelper.jsm");
  Cu.import("resource://gre/modules/FileUtils.jsm");
  Cu.import("resource://gre/modules/Geometry.jsm");
  Cu.import("resource://gre/modules/IndexedDBHelper.jsm");
  Cu.import("resource://gre/modules/NetUtil.jsm");
  Cu.import("resource://gre/modules/Services.jsm");
  Cu.import("resource://gre/modules/SettingsDB.jsm");
  Cu.import("resource://gre/modules/XPCOMUtils.jsm");

  Cc["@mozilla.org/appshell/appShellService;1"].getService(Ci["nsIAppShellService"]);
  Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci["nsIWindowMediator"]);
  Cc["@mozilla.org/base/telemetry;1"].getService(Ci["nsITelemetry"]);
  Cc["@mozilla.org/categorymanager;1"].getService(Ci["nsICategoryManager"]);
  Cc["@mozilla.org/childprocessmessagemanager;1"].getService(Ci["nsIMessageSender"]);
  Cc["@mozilla.org/consoleservice;1"].getService(Ci["nsIConsoleService"]);
  Cc["@mozilla.org/docshell/urifixup;1"].getService(Ci["nsIURIFixup"]);
  Cc["@mozilla.org/dom/dom-request-service;1"].getService(Ci["nsIDOMRequestService"]);
  Cc["@mozilla.org/embedcomp/prompt-service;1"].getService(Ci["nsIPromptService"]);
  Cc["@mozilla.org/embedcomp/window-watcher;1"].getService(Ci["nsIWindowWatcher"]);
  Cc["@mozilla.org/eventlistenerservice;1"].getService(Ci["nsIEventListenerService"]);
  Cc["@mozilla.org/focus-manager;1"].getService(Ci["nsIFocusManager"]);
  Cc["@mozilla.org/intl/nslocaleservice;1"].getService(Ci["nsILocaleService"]);
  Cc["@mozilla.org/intl/stringbundle;1"].getService(Ci["nsIStringBundleService"]);
  Cc["@mozilla.org/layout/content-policy;1"].getService(Ci["nsIContentPolicy"]);
  Cc["@mozilla.org/message-loop;1"].getService(Ci["nsIMessageLoop"]);
  Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci["mozIJSSubScriptLoader"]);
  Cc["@mozilla.org/network/application-cache-service;1"].getService(Ci["nsIApplicationCacheService"]);
  Cc["@mozilla.org/network/dns-service;1"].getService(Ci["nsIDNSService"]);
  Cc["@mozilla.org/network/effective-tld-service;1"].getService(Ci["nsIEffectiveTLDService"]);
  Cc["@mozilla.org/network/idn-service;1"].getService(Ci["nsIIDNService"]);
  Cc["@mozilla.org/network/io-service;1"].getService(Ci["nsIIOService2"]);
  Cc["@mozilla.org/network/mime-hdrparam;1"].getService(Ci["nsIMIMEHeaderParam"]);
  Cc["@mozilla.org/network/socket-transport-service;1"].getService(Ci["nsISocketTransportService"]);
  Cc["@mozilla.org/network/stream-transport-service;1"].getService(Ci["nsIStreamTransportService"]);
  Cc["@mozilla.org/network/url-parser;1?auth=maybe"].getService(Ci["nsIURLParser"]);
  Cc["@mozilla.org/network/url-parser;1?auth=no"].getService(Ci["nsIURLParser"]);
  Cc["@mozilla.org/network/url-parser;1?auth=yes"].getService(Ci["nsIURLParser"]);
  Cc["@mozilla.org/observer-service;1"].getService(Ci["nsIObserverService"]);
  Cc["@mozilla.org/preferences-service;1"].getService(Ci["nsIPrefBranch"]);
  Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci["nsIScriptSecurityManager"]);
  Cc["@mozilla.org/storage/service;1"].getService(Ci["mozIStorageService"]);
  Cc["@mozilla.org/system-info;1"].getService(Ci["nsIPropertyBag2"]);
  Cc["@mozilla.org/thread-manager;1"].getService(Ci["nsIThreadManager"]);
  Cc["@mozilla.org/toolkit/app-startup;1"].getService(Ci["nsIAppStartup"]);
  Cc["@mozilla.org/uriloader;1"].getService(Ci["nsIURILoader"]);
  Cc["@mozilla.org/cspcontext;1"].createInstance(Ci["nsIContentSecurityPolicy"]);
  Cc["@mozilla.org/settingsManager;1"].createInstance(Ci["nsISupports"]);

  /* Applications Specific Helper */
  try {
    if (Services.prefs.getBoolPref("dom.sysmsg.enabled")) {
      Cc["@mozilla.org/system-message-manager;1"].getService(Ci["nsIDOMNavigatorSystemMessages"]);
    }
  } catch(e) {
  }

  try {
    if (Services.prefs.getBoolPref("dom.mozInputMethod.enabled")) {
      Services.scriptloader.loadSubScript("chrome://global/content/forms.js", global);
    }
  } catch (e) {
  }

  if (Services.prefs.getIntPref("dom.w3c_touch_events.enabled") != 0) {
    try {
      if (Services.prefs.getBoolPref("layers.async-pan-zoom.enabled") === false) {
        Services.scriptloader.loadSubScript("chrome://global/content/BrowserElementPanningAPZDisabled.js", global);
      }
    } catch (e) {
    }

    Services.scriptloader.loadSubScript("chrome://global/content/BrowserElementPanning.js", global);
  }

  Services.scriptloader.loadSubScript("chrome://global/content/BrowserElementCopyPaste.js", global);
  Services.scriptloader.loadSubScript("chrome://global/content/BrowserElementChildPreload.js", global);

  Services.io.getProtocolHandler("app");
  Services.io.getProtocolHandler("default");

  // Register an observer for topic "preload_postfork" after we fork a content
  // process.
  DoPreloadPostfork(function () {
    // Load AppsServiceChild.jsm after fork since it sends an async message to
    // the chrome process in its init() function.
    Cu.import("resource://gre/modules/AppsServiceChild.jsm");

    // Load UserCustomizations.jsm after fork since it sends an async message to
    // the chrome process in its init() function.
    try {
      if (Services.prefs.getBoolPref("dom.apps.customization.enabled")) {
        Cu.import("resource://gre/modules/UserCustomizations.jsm");
      }
    } catch(e) {}

    // Load nsIAppsService after fork since its implementation loads
    // AppsServiceChild.jsm
    Cc["@mozilla.org/AppsService;1"].getService(Ci["nsIAppsService"]);

    // Load nsICookieService after fork since it sends an IPC constructor
    // message to the chrome process.
    Cc["@mozilla.org/cookieService;1"].getService(Ci["nsICookieService"]);

    // Load nsIPermissionManager after fork since it sends a message to the
    // chrome process to read permissions.
    Cc["@mozilla.org/permissionmanager;1"].getService(Ci["nsIPermissionManager"]);

    // Create this instance after fork since it loads AppsServiceChild.jsm
    Cc["@mozilla.org/webapps;1"].createInstance(Ci["nsISupports"]);

    // Load nsIProtocolProxyService after fork since it asynchronously accesses
    // the "Proxy Resolution" thread after it's frozen.
    Cc["@mozilla.org/network/protocol-proxy-service;1"].getService(Ci["nsIProtocolProxyService"]);

    // Call docShell.createAboutBlankContentViewer() after fork since it has IPC
    // activity in the PCompositor protocol.
    docShell.createAboutBlankContentViewer(null);
    docShell.isActive = false;
  });
})(this);