gecko-dev/dom/notification/NotificationStorage.js

245 строки
7.1 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";
const DEBUG = false;
function debug(s) { dump("-*- NotificationStorage.js: " + s + "\n"); }
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
const NOTIFICATIONSTORAGE_CID = "{37f819b0-0b5c-11e3-8ffd-0800200c9a66}";
const NOTIFICATIONSTORAGE_CONTRACTID = "@mozilla.org/notificationStorage;1";
XPCOMUtils.defineLazyModuleGetter(this, "Services",
"resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
"@mozilla.org/childprocessmessagemanager;1",
"nsIMessageSender");
const kMessageNotificationGetAllOk = "Notification:GetAll:Return:OK";
const kMessageNotificationGetAllKo = "Notification:GetAll:Return:KO";
const kMessageNotificationSaveKo = "Notification:Save:Return:KO";
const kMessageNotificationDeleteKo = "Notification:Delete:Return:KO";
const kMessages = [
kMessageNotificationGetAllOk,
kMessageNotificationGetAllKo,
kMessageNotificationSaveKo,
kMessageNotificationDeleteKo
];
function NotificationStorage() {
// cache objects
this._notifications = {};
this._byTag = {};
this._cached = false;
this._requests = {};
this._requestCount = 0;
Services.obs.addObserver(this, "xpcom-shutdown", false);
// Register for message listeners.
this.registerListeners();
}
NotificationStorage.prototype = {
registerListeners: function() {
for (let message of kMessages) {
cpmm.addMessageListener(message, this);
}
},
unregisterListeners: function() {
for (let message of kMessages) {
cpmm.removeMessageListener(message, this);
}
},
observe: function(aSubject, aTopic, aData) {
if (DEBUG) debug("Topic: " + aTopic);
if (aTopic == "xpcom-shutdown") {
Services.obs.removeObserver(this, "xpcom-shutdown");
this.unregisterListeners();
}
},
put: function(origin, id, title, dir, lang, body, tag, icon, alertName,
data, behavior) {
if (DEBUG) { debug("PUT: " + id + ": " + title); }
var notification = {
id: id,
title: title,
dir: dir,
lang: lang,
body: body,
tag: tag,
icon: icon,
alertName: alertName,
timestamp: new Date().getTime(),
origin: origin,
data: data,
mozbehavior: behavior
};
this._notifications[id] = notification;
if (tag) {
if (!this._byTag[origin]) {
this._byTag[origin] = {};
}
// We might have existing notification with this tag,
// if so we need to remove it from our cache.
if (this._byTag[origin][tag]) {
var oldNotification = this._byTag[origin][tag];
delete this._notifications[oldNotification.id];
}
this._byTag[origin][tag] = notification;
};
cpmm.sendAsyncMessage("Notification:Save", {
origin: origin,
notification: notification
});
},
get: function(origin, tag, callback) {
if (DEBUG) { debug("GET: " + origin + " " + tag); }
if (this._cached) {
this._fetchFromCache(origin, tag, callback);
} else {
this._fetchFromDB(origin, tag, callback);
}
},
delete: function(origin, id) {
if (DEBUG) { debug("DELETE: " + id); }
var notification = this._notifications[id];
if (notification) {
if (notification.tag) {
delete this._byTag[origin][notification.tag];
}
delete this._notifications[id];
}
cpmm.sendAsyncMessage("Notification:Delete", {
origin: origin,
id: id
});
},
receiveMessage: function(message) {
var request = this._requests[message.data.requestID];
switch (message.name) {
case kMessageNotificationGetAllOk:
delete this._requests[message.data.requestID];
this._populateCache(message.data.notifications);
this._fetchFromCache(request.origin, request.tag, request.callback);
break;
case kMessageNotificationGetAllKo:
delete this._requests[message.data.requestID];
try {
request.callback.done();
} catch (e) {
debug("Error calling callback done: " + e);
}
case kMessageNotificationSaveKo:
case kMessageNotificationDeleteKo:
if (DEBUG) {
debug("Error received when treating: '" + message.name +
"': " + message.data.errorMsg);
}
break;
default:
if (DEBUG) debug("Unrecognized message: " + message.name);
break;
}
},
_fetchFromDB: function(origin, tag, callback) {
var request = {
origin: origin,
tag: tag,
callback: callback
};
var requestID = this._requestCount++;
this._requests[requestID] = request;
cpmm.sendAsyncMessage("Notification:GetAll", {
origin: origin,
requestID: requestID
});
},
_fetchFromCache: function(origin, tag, callback) {
var notifications = [];
// If a tag was specified and we have a notification
// with this tag, return that. If no tag was specified
// simple return all stored notifications.
if (tag && this._byTag[origin] && this._byTag[origin][tag]) {
notifications.push(this._byTag[origin][tag]);
} else if (!tag) {
for (var id in this._notifications) {
if (this._notifications[id].origin === origin) {
notifications.push(this._notifications[id]);
}
}
}
// Pass each notification back separately.
notifications.forEach(function(notification) {
try {
callback.handle(notification.id,
notification.title,
notification.dir,
notification.lang,
notification.body,
notification.tag,
notification.icon,
notification.data,
notification.mozbehavior);
} catch (e) {
if (DEBUG) { debug("Error calling callback handle: " + e); }
}
});
try {
callback.done();
} catch (e) {
if (DEBUG) { debug("Error calling callback done: " + e); }
}
},
_populateCache: function(notifications) {
notifications.forEach(function(notification) {
this._notifications[notification.id] = notification;
if (notification.tag && notification.origin) {
let tag = notification.tag;
let origin = notification.origin;
if (!this._byTag[origin]) {
this._byTag[origin] = {};
}
this._byTag[origin][tag] = notification;
}
}.bind(this));
this._cached = true;
},
classID : Components.ID(NOTIFICATIONSTORAGE_CID),
contractID : NOTIFICATIONSTORAGE_CONTRACTID,
QueryInterface: XPCOMUtils.generateQI([Ci.nsINotificationStorage,
Ci.nsIMessageListener]),
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([NotificationStorage]);