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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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browser/experiments/ExperimentsService.js Normal file
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/* 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/. */
"use strict";
const {interfaces: Ci, utils: Cu} = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/Preferences.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Experiments",
"resource:///modules/experiments/Experiments.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "OS",
"resource://gre/modules/osfile.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "CommonUtils",
"resource://services-common/utils.js");
const PREF_EXPERIMENTS_ENABLED = "experiments.enabled";
const PREF_ACTIVE_EXPERIMENT = "experiments.activeExperiment"; // whether we have an active experiment
const PREF_TELEMETRY_ENABLED = "toolkit.telemetry.enabled";
const PREF_TELEMETRY_UNIFIED = "toolkit.telemetry.unified";
const DELAY_INIT_MS = 30 * 1000;
// Whether the FHR/Telemetry unification features are enabled.
// Changing this pref requires a restart.
const IS_UNIFIED_TELEMETRY = Preferences.get(PREF_TELEMETRY_UNIFIED, false);
XPCOMUtils.defineLazyGetter(
this, "gPrefs", () => {
return new Preferences();
});
XPCOMUtils.defineLazyGetter(
this, "gExperimentsEnabled", () => {
// We can enable experiments if either unified Telemetry or FHR is on, and the user
// has opted into Telemetry.
return gPrefs.get(PREF_EXPERIMENTS_ENABLED, false) &&
IS_UNIFIED_TELEMETRY && gPrefs.get(PREF_TELEMETRY_ENABLED, false);
});
XPCOMUtils.defineLazyGetter(
this, "gActiveExperiment", () => {
return gPrefs.get(PREF_ACTIVE_EXPERIMENT);
});
function ExperimentsService() {
this._initialized = false;
this._delayedInitTimer = null;
}
ExperimentsService.prototype = {
classID: Components.ID("{f7800463-3b97-47f9-9341-b7617e6d8d49}"),
QueryInterface: XPCOMUtils.generateQI([Ci.nsITimerCallback, Ci.nsIObserver]),
notify: function (timer) {
if (!gExperimentsEnabled) {
return;
}
if (OS.Constants.Path.profileDir === undefined) {
throw Error("Update timer fired before profile was initialized?");
}
let instance = Experiments.instance();
if (instance.isReady) {
instance.updateManifest();
}
},
_delayedInit: function () {
if (!this._initialized) {
this._initialized = true;
Experiments.instance(); // for side effects
}
},
observe: function (subject, topic, data) {
switch (topic) {
case "profile-after-change":
if (gExperimentsEnabled) {
Services.obs.addObserver(this, "quit-application", false);
Services.obs.addObserver(this, "sessionstore-state-finalized", false);
Services.obs.addObserver(this, "EM-loaded", false);
if (gActiveExperiment) {
this._initialized = true;
Experiments.instance(); // for side effects
}
}
break;
case "sessionstore-state-finalized":
if (!this._initialized) {
CommonUtils.namedTimer(this._delayedInit, DELAY_INIT_MS, this, "_delayedInitTimer");
}
break;
case "EM-loaded":
if (!this._initialized) {
Experiments.instance(); // for side effects
this._initialized = true;
if (this._delayedInitTimer) {
this._delayedInitTimer.clear();
}
}
break;
case "quit-application":
Services.obs.removeObserver(this, "quit-application");
Services.obs.removeObserver(this, "sessionstore-state-finalized");
Services.obs.removeObserver(this, "EM-loaded");
if (this._delayedInitTimer) {
this._delayedInitTimer.clear();
}
break;
}
},
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ExperimentsService]);