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comparison: dom/datastore/DataStoreChangeNotifier.jsm
dom/datastore/DataStoreChangeNotifier.jsm
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| -1:000000000000 | 0:52dca603d93f |
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| 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 {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components; | |
| 8 | |
| 9 this.EXPORTED_SYMBOLS = ["DataStoreChangeNotifier"]; | |
| 10 | |
| 11 function debug(s) { | |
| 12 //dump('DEBUG DataStoreChangeNotifier: ' + s + '\n'); | |
| 13 } | |
| 14 | |
| 15 // DataStoreServiceInternal should not be converted into a lazy getter as it | |
| 16 // runs code during initialization. | |
| 17 Cu.import('resource://gre/modules/DataStoreServiceInternal.jsm'); | |
| 18 Cu.import("resource://gre/modules/XPCOMUtils.jsm"); | |
| 19 Cu.import("resource://gre/modules/Services.jsm"); | |
| 20 | |
| 21 XPCOMUtils.defineLazyServiceGetter(this, "ppmm", | |
| 22 "@mozilla.org/parentprocessmessagemanager;1", | |
| 23 "nsIMessageBroadcaster"); | |
| 24 | |
| 25 this.DataStoreChangeNotifier = { | |
| 26 children: [], | |
| 27 messages: [ "DataStore:Changed", "DataStore:RegisterForMessages", | |
| 28 "DataStore:UnregisterForMessages", | |
| 29 "child-process-shutdown" ], | |
| 30 | |
| 31 init: function() { | |
| 32 debug("init"); | |
| 33 | |
| 34 this.messages.forEach((function(msgName) { | |
| 35 ppmm.addMessageListener(msgName, this); | |
| 36 }).bind(this)); | |
| 37 | |
| 38 Services.obs.addObserver(this, 'xpcom-shutdown', false); | |
| 39 }, | |
| 40 | |
| 41 observe: function(aSubject, aTopic, aData) { | |
| 42 debug("observe"); | |
| 43 | |
| 44 switch (aTopic) { | |
| 45 case 'xpcom-shutdown': | |
| 46 this.messages.forEach((function(msgName) { | |
| 47 ppmm.removeMessageListener(msgName, this); | |
| 48 }).bind(this)); | |
| 49 | |
| 50 Services.obs.removeObserver(this, 'xpcom-shutdown'); | |
| 51 ppmm = null; | |
| 52 break; | |
| 53 | |
| 54 default: | |
| 55 debug("Wrong observer topic: " + aTopic); | |
| 56 break; | |
| 57 } | |
| 58 }, | |
| 59 | |
| 60 broadcastMessage: function broadcastMessage(aData) { | |
| 61 debug("Broadast"); | |
| 62 this.children.forEach(function(obj) { | |
| 63 if (obj.store == aData.store && obj.owner == aData.owner) { | |
| 64 obj.mm.sendAsyncMessage("DataStore:Changed:Return:OK", aData); | |
| 65 } | |
| 66 }); | |
| 67 }, | |
| 68 | |
| 69 | |
| 70 receiveMessage: function(aMessage) { | |
| 71 debug("receiveMessage"); | |
| 72 | |
| 73 // No check has to be done when the message is 'child-process-shutdown' | |
| 74 // because at this point the target is already disconnected from | |
| 75 // nsFrameMessageManager, so that assertAppHasStatus will always fail. | |
| 76 let prefName = 'dom.testing.datastore_enabled_for_hosted_apps'; | |
| 77 if (aMessage.name != 'child-process-shutdown' && | |
| 78 (Services.prefs.getPrefType(prefName) == Services.prefs.PREF_INVALID || | |
| 79 !Services.prefs.getBoolPref(prefName)) && | |
| 80 !aMessage.target.assertAppHasStatus(Ci.nsIPrincipal.APP_STATUS_CERTIFIED)) { | |
| 81 return; | |
| 82 } | |
| 83 | |
| 84 switch (aMessage.name) { | |
| 85 case "DataStore:Changed": | |
| 86 this.broadcastMessage(aMessage.data); | |
| 87 break; | |
| 88 | |
| 89 case "DataStore:RegisterForMessages": | |
| 90 debug("Register!"); | |
| 91 | |
| 92 for (let i = 0; i < this.children.length; ++i) { | |
| 93 if (this.children[i].mm == aMessage.target && | |
| 94 this.children[i].store == aMessage.data.store && | |
| 95 this.children[i].owner == aMessage.data.owner) { | |
| 96 debug("Register on existing index: " + i); | |
| 97 ++this.children[i].count; | |
| 98 return; | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 this.children.push({ mm: aMessage.target, | |
| 103 store: aMessage.data.store, | |
| 104 owner: aMessage.data.owner, | |
| 105 count: 1 }); | |
| 106 break; | |
| 107 | |
| 108 case "child-process-shutdown": | |
| 109 case "DataStore:UnregisterForMessages": | |
| 110 debug("Unregister"); | |
| 111 | |
| 112 for (let i = 0; i < this.children.length;) { | |
| 113 if (this.children[i].mm == aMessage.target) { | |
| 114 debug("Unregister index: " + i); | |
| 115 if (!--this.children[i].count) { | |
| 116 debug("Unregister delete index: " + i); | |
| 117 this.children.splice(i, 1); | |
| 118 } | |
| 119 break; | |
| 120 } else { | |
| 121 ++i; | |
| 122 } | |
| 123 } | |
| 124 break; | |
| 125 | |
| 126 default: | |
| 127 debug("Wrong message: " + aMessage.name); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 DataStoreChangeNotifier.init(); |
