gecko-dev/dom/settings/SettingsService.js

186 строки
6.2 KiB
JavaScript

/* 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"
/* static functions */
let DEBUG = 0;
if (DEBUG)
debug = function (s) { dump("-*- SettingsService: " + s + "\n"); }
else
debug = function (s) {}
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/SettingsQueue.jsm");
Cu.import("resource://gre/modules/SettingsDB.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
const nsIClassInfo = Ci.nsIClassInfo;
const SETTINGSSERVICELOCK_CONTRACTID = "@mozilla.org/settingsServiceLock;1";
const SETTINGSSERVICELOCK_CID = Components.ID("{d7a395a0-e292-11e1-834e-1761d57f5f99}");
const nsISettingsServiceLock = Ci.nsISettingsServiceLock;
function SettingsServiceLock(aSettingsService)
{
debug("settingsServiceLock constr!");
this._open = true;
this._requests = new Queue();
this._settingsService = aSettingsService;
this._transaction = null;
}
SettingsServiceLock.prototype = {
process: function process() {
debug("process!");
let lock = this;
lock._open = false;
let store = lock._transaction.objectStore(SETTINGSSTORE_NAME);
while (!lock._requests.isEmpty()) {
let info = lock._requests.dequeue();
debug("info:" + info.intent);
let callback = info.callback;
let req;
let name = info.name;
switch (info.intent) {
case "set":
let value = info.value;
let message = info.message;
if(typeof(value) == 'object')
debug("object name:" + name + ", val: " + JSON.stringify(value));
req = store.put({ settingName: name, settingValue: value });
req.onsuccess = function() {
debug("set on success");
lock._open = true;
if (callback)
callback.handle(name, value);
Services.obs.notifyObservers(lock, "mozsettings-changed", JSON.stringify({
key: name,
value: value,
message: message
}));
lock._open = false;
};
req.onerror = function(event) { callback ? callback.handleError(event.target.errorMessage) : null; };
break;
case "get":
req = store.mozGetAll(name);
req.onsuccess = function(event) {
debug("Request successful. Record count:" + event.target.result.length);
debug("result: " + JSON.stringify(event.target.result));
this._open = true;
if (callback) {
if (event.target.result[0]) {
if (event.target.result.length > 1) {
debug("Warning: overloaded setting:" + name);
}
callback.handle(name, event.target.result[0].settingValue);
} else
callback.handle(name, null);
} else {
debug("no callback defined!");
}
this._open = false;
}.bind(lock);
req.onerror = function error(event) { callback ? callback.handleError(event.target.errorMessage) : null; };
break;
}
}
if (!lock._requests.isEmpty())
throw Components.results.NS_ERROR_ABORT;
lock._open = true;
},
createTransactionAndProcess: function createTransactionAndProcess() {
if (this._settingsService._settingsDB._db) {
var lock;
while (lock = this._settingsService._locks.dequeue()) {
if (!lock._transaction) {
lock._transaction = lock._settingsService._settingsDB._db.transaction(SETTINGSSTORE_NAME, "readwrite");
}
lock.process();
}
if (!this._requests.isEmpty())
this.process();
}
},
get: function get(aName, aCallback) {
debug("get: " + aName + ", " + aCallback);
this._requests.enqueue({ callback: aCallback, intent:"get", name: aName });
this.createTransactionAndProcess();
},
set: function set(aName, aValue, aCallback, aMessage) {
debug("set: " + aName + ": " + JSON.stringify(aValue));
if (aMessage === undefined)
aMessage = null;
this._requests.enqueue({ callback: aCallback,
intent: "set",
name: aName,
value: aValue,
message: aMessage });
this.createTransactionAndProcess();
},
classID : SETTINGSSERVICELOCK_CID,
QueryInterface : XPCOMUtils.generateQI([nsISettingsServiceLock]),
classInfo : XPCOMUtils.generateCI({ classID: SETTINGSSERVICELOCK_CID,
contractID: SETTINGSSERVICELOCK_CONTRACTID,
classDescription: "SettingsServiceLock",
interfaces: [nsISettingsServiceLock],
flags: nsIClassInfo.DOM_OBJECT })
};
const SETTINGSSERVICE_CID = Components.ID("{f656f0c0-f776-11e1-a21f-0800200c9a66}");
let myGlobal = this;
function SettingsService()
{
debug("settingsService Constructor");
this._locks = new Queue();
if (!("indexedDB" in myGlobal)) {
let idbManager = Components.classes["@mozilla.org/dom/indexeddb/manager;1"].getService(Ci.nsIIndexedDatabaseManager);
idbManager.initWindowless(myGlobal);
}
this._settingsDB = new SettingsDB();
this._settingsDB.init(myGlobal);
}
SettingsService.prototype = {
nextTick: function nextTick(aCallback, thisObj) {
if (thisObj)
aCallback = aCallback.bind(thisObj);
Services.tm.currentThread.dispatch(aCallback, Ci.nsIThread.DISPATCH_NORMAL);
},
createLock: function createLock() {
debug("get lock!");
var lock = new SettingsServiceLock(this);
this._locks.enqueue(lock);
this._settingsDB.ensureDB(
function() { lock.createTransactionAndProcess(); },
function() { dump("ensureDB error cb!\n"); },
myGlobal );
this.nextTick(function() { this._open = false; }, lock);
return lock;
},
classID : SETTINGSSERVICE_CID,
QueryInterface : XPCOMUtils.generateQI([Ci.nsISettingsService]),
}
const NSGetFactory = XPCOMUtils.generateNSGetFactory([SettingsService, SettingsServiceLock])