The Tor Browser / file comparison
comparison: dom/settings/SettingsChangeNotifier.jsm
dom/settings/SettingsChangeNotifier.jsm
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:10f1e9bccdae |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 "use strict" | |
| 6 | |
| 7 const DEBUG = false; | |
| 8 function debug(s) { | |
| 9 if (DEBUG) dump("-*- SettingsChangeNotifier: " + s + "\n"); | |
| 10 } | |
| 11 | |
| 12 const Cu = Components.utils; | |
| 13 const Cc = Components.classes; | |
| 14 const Ci = Components.interfaces; | |
| 15 | |
| 16 this.EXPORTED_SYMBOLS = ["SettingsChangeNotifier"]; | |
| 17 | |
| 18 Cu.import("resource://gre/modules/XPCOMUtils.jsm"); | |
| 19 Cu.import("resource://gre/modules/Services.jsm"); | |
| 20 | |
| 21 const kXpcomShutdownObserverTopic = "xpcom-shutdown"; | |
| 22 const kMozSettingsChangedObserverTopic = "mozsettings-changed"; | |
| 23 const kFromSettingsChangeNotifier = "fromSettingsChangeNotifier"; | |
| 24 | |
| 25 XPCOMUtils.defineLazyServiceGetter(this, "ppmm", | |
| 26 "@mozilla.org/parentprocessmessagemanager;1", | |
| 27 "nsIMessageBroadcaster"); | |
| 28 | |
| 29 this.SettingsChangeNotifier = { | |
| 30 init: function() { | |
| 31 if (DEBUG) debug("init"); | |
| 32 this.children = []; | |
| 33 this._messages = ["Settings:Changed", "Settings:RegisterForMessages", "child-process-shutdown"]; | |
| 34 this._messages.forEach((function(msgName) { | |
| 35 ppmm.addMessageListener(msgName, this); | |
| 36 }).bind(this)); | |
| 37 | |
| 38 Services.obs.addObserver(this, kXpcomShutdownObserverTopic, false); | |
| 39 Services.obs.addObserver(this, kMozSettingsChangedObserverTopic, false); | |
| 40 }, | |
| 41 | |
| 42 observe: function(aSubject, aTopic, aData) { | |
| 43 if (DEBUG) debug("observe"); | |
| 44 switch (aTopic) { | |
| 45 case kXpcomShutdownObserverTopic: | |
| 46 this._messages.forEach((function(msgName) { | |
| 47 ppmm.removeMessageListener(msgName, this); | |
| 48 }).bind(this)); | |
| 49 Services.obs.removeObserver(this, kXpcomShutdownObserverTopic); | |
| 50 Services.obs.removeObserver(this, kMozSettingsChangedObserverTopic); | |
| 51 ppmm = null; | |
| 52 break; | |
| 53 case kMozSettingsChangedObserverTopic: | |
| 54 { | |
| 55 let setting = JSON.parse(aData); | |
| 56 // To avoid redundantly broadcasting settings-changed events that are | |
| 57 // just requested from content processes themselves, skip the observer | |
| 58 // messages that are notified from the internal SettingsChangeNotifier. | |
| 59 if (setting.message && setting.message === kFromSettingsChangeNotifier) | |
| 60 return; | |
| 61 this.broadcastMessage("Settings:Change:Return:OK", | |
| 62 { key: setting.key, value: setting.value }); | |
| 63 break; | |
| 64 } | |
| 65 default: | |
| 66 if (DEBUG) debug("Wrong observer topic: " + aTopic); | |
| 67 break; | |
| 68 } | |
| 69 }, | |
| 70 | |
| 71 broadcastMessage: function broadcastMessage(aMsgName, aContent) { | |
| 72 if (DEBUG) debug("Broadast"); | |
| 73 this.children.forEach(function(msgMgr) { | |
| 74 msgMgr.sendAsyncMessage(aMsgName, aContent); | |
| 75 }); | |
| 76 }, | |
| 77 | |
| 78 receiveMessage: function(aMessage) { | |
| 79 if (DEBUG) debug("receiveMessage"); | |
| 80 let msg = aMessage.data; | |
| 81 let mm = aMessage.target; | |
| 82 switch (aMessage.name) { | |
| 83 case "Settings:Changed": | |
| 84 if (!aMessage.target.assertPermission("settings-write")) { | |
| 85 Cu.reportError("Settings message " + msg.name + | |
| 86 " from a content process with no 'settings-write' privileges."); | |
| 87 return null; | |
| 88 } | |
| 89 this.broadcastMessage("Settings:Change:Return:OK", | |
| 90 { key: msg.key, value: msg.value }); | |
| 91 Services.obs.notifyObservers(this, kMozSettingsChangedObserverTopic, | |
| 92 JSON.stringify({ | |
| 93 key: msg.key, | |
| 94 value: msg.value, | |
| 95 message: kFromSettingsChangeNotifier | |
| 96 })); | |
| 97 break; | |
| 98 case "Settings:RegisterForMessages": | |
| 99 if (!aMessage.target.assertPermission("settings-read")) { | |
| 100 Cu.reportError("Settings message " + msg.name + | |
| 101 " from a content process with no 'settings-read' privileges."); | |
| 102 return null; | |
| 103 } | |
| 104 if (DEBUG) debug("Register!"); | |
| 105 if (this.children.indexOf(mm) == -1) { | |
| 106 this.children.push(mm); | |
| 107 } | |
| 108 break; | |
| 109 case "child-process-shutdown": | |
| 110 if (DEBUG) debug("Unregister"); | |
| 111 let index; | |
| 112 if ((index = this.children.indexOf(mm)) != -1) { | |
| 113 if (DEBUG) debug("Unregister index: " + index); | |
| 114 this.children.splice(index, 1); | |
| 115 } | |
| 116 break; | |
| 117 default: | |
| 118 if (DEBUG) debug("Wrong message: " + aMessage.name); | |
| 119 } | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 SettingsChangeNotifier.init(); |
