зеркало из https://github.com/mozilla/gecko-dev.git
348 строки
11 KiB
JavaScript
348 строки
11 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import('resource://gre/modules/SettingsRequestManager.jsm');
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/* static functions */
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let DEBUG = false;
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let VERBOSE = false;
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try {
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DEBUG =
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Services.prefs.getBoolPref("dom.mozSettings.SettingsService.debug.enabled");
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VERBOSE =
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Services.prefs.getBoolPref("dom.mozSettings.SettingsService.verbose.enabled");
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} catch (ex) { }
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function debug(s) {
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dump("-*- SettingsService: " + s + "\n");
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}
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XPCOMUtils.defineLazyServiceGetter(this, "uuidgen",
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"@mozilla.org/uuid-generator;1",
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"nsIUUIDGenerator");
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XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
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"@mozilla.org/childprocessmessagemanager;1",
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"nsIMessageSender");
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XPCOMUtils.defineLazyServiceGetter(this, "mrm",
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"@mozilla.org/memory-reporter-manager;1",
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"nsIMemoryReporterManager");
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const nsIClassInfo = Ci.nsIClassInfo;
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const kXpcomShutdownObserverTopic = "xpcom-shutdown";
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const SETTINGSSERVICELOCK_CONTRACTID = "@mozilla.org/settingsServiceLock;1";
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const SETTINGSSERVICELOCK_CID = Components.ID("{d7a395a0-e292-11e1-834e-1761d57f5f99}");
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const nsISettingsServiceLock = Ci.nsISettingsServiceLock;
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function makeSettingsServiceRequest(aCallback, aName, aValue) {
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return {
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callback: aCallback,
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name: aName,
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value: aValue
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};
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};
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function SettingsServiceLock(aSettingsService, aTransactionCallback) {
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if (VERBOSE) debug("settingsServiceLock constr!");
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this._open = true;
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this._settingsService = aSettingsService;
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this._id = uuidgen.generateUUID().toString();
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this._transactionCallback = aTransactionCallback;
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this._requests = {};
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let closeHelper = function() {
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if (VERBOSE) debug("closing lock " + this._id);
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this._open = false;
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this.runOrFinalizeQueries();
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}.bind(this);
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let msgs = ["Settings:Get:OK", "Settings:Get:KO",
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"Settings:Clear:OK", "Settings:Clear:KO",
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"Settings:Set:OK", "Settings:Set:KO",
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"Settings:Finalize:OK", "Settings:Finalize:KO"];
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for (let msg in msgs) {
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cpmm.addMessageListener(msgs[msg], this);
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}
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let createLockPayload = {
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lockID: this._id,
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isServiceLock: true,
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windowID: undefined,
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lockStack: (new Error).stack
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};
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this.returnMessage("Settings:CreateLock", createLockPayload);
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Services.tm.currentThread.dispatch(closeHelper, Ci.nsIThread.DISPATCH_NORMAL);
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}
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SettingsServiceLock.prototype = {
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get closed() {
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return !this._open;
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},
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returnMessage: function(aMessage, aData) {
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SettingsRequestManager.receiveMessage({
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name: aMessage,
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data: aData,
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target: undefined,
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principal: Services.scriptSecurityManager.getSystemPrincipal()
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});
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},
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runOrFinalizeQueries: function() {
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if (!this._requests || Object.keys(this._requests).length == 0) {
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this.returnMessage("Settings:Finalize", {lockID: this._id});
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} else {
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this.returnMessage("Settings:Run", {lockID: this._id});
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}
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},
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receiveMessage: function(aMessage) {
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let msg = aMessage.data;
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// SettingsRequestManager broadcasts changes to all locks in the child. If
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// our lock isn't being addressed, just return.
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if(msg.lockID != this._id) {
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return;
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}
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if (VERBOSE) debug("receiveMessage (" + this._id + "): " + aMessage.name);
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// Finalizing a transaction does not return a request ID since we are
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// supposed to fire callbacks.
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if (!msg.requestID) {
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switch (aMessage.name) {
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case "Settings:Finalize:OK":
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if (VERBOSE) debug("Lock finalize ok!");
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this.callTransactionHandle();
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break;
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case "Settings:Finalize:KO":
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if (DEBUG) debug("Lock finalize failed!");
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this.callAbort();
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break;
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default:
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if (DEBUG) debug("Message type " + aMessage.name + " is missing a requestID");
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}
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this._settingsService.unregisterLock(this._id);
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return;
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}
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let req = this._requests[msg.requestID];
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if (!req) {
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if (DEBUG) debug("Matching request not found.");
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return;
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}
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delete this._requests[msg.requestID];
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switch (aMessage.name) {
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case "Settings:Get:OK":
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this._open = true;
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let settings_names = Object.keys(msg.settings);
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if (settings_names.length > 0) {
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let name = settings_names[0];
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if (DEBUG && settings_names.length > 1) {
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debug("Warning: overloaded setting:" + name);
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}
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let result = msg.settings[name];
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this.callHandle(req.callback, name, result);
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} else {
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this.callHandle(req.callback, req.name, null);
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}
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this._open = false;
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break;
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case "Settings:Set:OK":
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this._open = true;
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// We don't pass values back from sets in SettingsManager...
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this.callHandle(req.callback, req.name, req.value);
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this._open = false;
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break;
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case "Settings:Get:KO":
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case "Settings:Set:KO":
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if (DEBUG) debug("error:" + msg.errorMsg);
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this.callError(req.callback, msg.error);
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break;
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default:
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if (DEBUG) debug("Wrong message: " + aMessage.name);
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}
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this.runOrFinalizeQueries();
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},
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get: function get(aName, aCallback) {
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if (VERBOSE) debug("get (" + this._id + "): " + aName);
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if (!this._open) {
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if (DEBUG) debug("Settings lock not open!\n");
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throw Components.results.NS_ERROR_ABORT;
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}
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let reqID = uuidgen.generateUUID().toString();
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this._requests[reqID] = makeSettingsServiceRequest(aCallback, aName);
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this.returnMessage("Settings:Get", {requestID: reqID,
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lockID: this._id,
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name: aName});
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},
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set: function set(aName, aValue, aCallback) {
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if (VERBOSE) debug("set: " + aName + " " + aValue);
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if (!this._open) {
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throw "Settings lock not open";
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}
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let reqID = uuidgen.generateUUID().toString();
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this._requests[reqID] = makeSettingsServiceRequest(aCallback, aName, aValue);
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let settings = {};
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settings[aName] = aValue;
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this.returnMessage("Settings:Set", {requestID: reqID,
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lockID: this._id,
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settings: settings});
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},
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callHandle: function callHandle(aCallback, aName, aValue) {
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try {
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aCallback && aCallback.handle ? aCallback.handle(aName, aValue) : null;
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} catch (e) {
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if (DEBUG) debug("settings 'handle' callback threw an exception, dropping: " + e + "\n");
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}
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},
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callAbort: function callAbort(aCallback, aMessage) {
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try {
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aCallback && aCallback.handleAbort ? aCallback.handleAbort(aMessage) : null;
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} catch (e) {
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if (DEBUG) debug("settings 'abort' callback threw an exception, dropping: " + e + "\n");
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}
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},
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callError: function callError(aCallback, aMessage) {
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try {
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aCallback && aCallback.handleError ? aCallback.handleError(aMessage) : null;
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} catch (e) {
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if (DEBUG) debug("settings 'error' callback threw an exception, dropping: " + e + "\n");
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}
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},
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callTransactionHandle: function callTransactionHandle() {
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try {
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this._transactionCallback && this._transactionCallback.handle ? this._transactionCallback.handle() : null;
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} catch (e) {
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if (DEBUG) debug("settings 'Transaction handle' callback threw an exception, dropping: " + e + "\n");
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}
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},
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classID : SETTINGSSERVICELOCK_CID,
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QueryInterface : XPCOMUtils.generateQI([nsISettingsServiceLock])
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};
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const SETTINGSSERVICE_CID = Components.ID("{f656f0c0-f776-11e1-a21f-0800200c9a66}");
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function SettingsService()
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{
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if (VERBOSE) debug("settingsService Constructor");
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this._locks = [];
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this._serviceLocks = {};
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this._createdLocks = 0;
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this._unregisteredLocks = 0;
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this.init();
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}
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SettingsService.prototype = {
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init: function() {
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Services.obs.addObserver(this, kXpcomShutdownObserverTopic, false);
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mrm.registerStrongReporter(this);
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},
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uninit: function() {
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Services.obs.removeObserver(this, kXpcomShutdownObserverTopic);
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mrm.unregisterStrongReporter(this);
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},
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observe: function(aSubject, aTopic, aData) {
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if (VERBOSE) debug("observe: " + aTopic);
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if (aTopic === kXpcomShutdownObserverTopic) {
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this.uninit();
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}
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},
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receiveMessage: function(aMessage) {
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if (VERBOSE) debug("Entering receiveMessage");
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let lockID = aMessage.data.lockID;
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if (!lockID) {
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if (DEBUG) debug("No lock ID");
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return;
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}
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if (!(lockID in this._serviceLocks)) {
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if (DEBUG) debug("Received message for lock " + lockID + " but no lock");
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return;
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}
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if (VERBOSE) debug("Delivering message");
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this._serviceLocks[lockID].receiveMessage(aMessage);
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},
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createLock: function createLock(aCallback) {
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if (VERBOSE) debug("Calling createLock");
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var lock = new SettingsServiceLock(this, aCallback);
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if (VERBOSE) debug("Created lock " + lock._id);
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this.registerLock(lock);
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return lock;
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},
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registerLock: function(aLock) {
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if (VERBOSE) debug("Registering lock " + aLock._id);
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this._locks.push(aLock._id);
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this._serviceLocks[aLock._id] = aLock;
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this._createdLocks++;
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},
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unregisterLock: function(aLockID) {
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let lock_index = this._locks.indexOf(aLockID);
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if (lock_index != -1) {
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if (VERBOSE) debug("Unregistering lock " + aLockID);
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this._locks.splice(lock_index, 1);
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this._serviceLocks[aLockID] = null;
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delete this._serviceLocks[aLockID];
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this._unregisteredLocks++;
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}
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},
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collectReports: function(aCallback, aData, aAnonymize) {
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aCallback.callback("",
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"settings-service-locks/alive",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._locks.length,
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"The number of service locks that are currently alives.",
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aData);
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aCallback.callback("",
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"settings-service-locks/created",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._createdLocks,
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"The number of service locks that were created.",
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aData);
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aCallback.callback("",
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"settings-service-locks/deleted",
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Ci.nsIMemoryReporter.KIND_OTHER,
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Ci.nsIMemoryReporter.UNITS_COUNT,
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this._unregisteredLocks,
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"The number of service locks that were deleted.",
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aData);
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},
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classID : SETTINGSSERVICE_CID,
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QueryInterface : XPCOMUtils.generateQI([Ci.nsISettingsService,
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Ci.nsIObserver,
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Ci.nsIMemoryReporter])
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};
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this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SettingsService, SettingsServiceLock]);
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