1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
6#define CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
7
8#include <string>
9
10#include "base/memory/weak_ptr.h"
11#include "chrome/browser/web_resource/web_resource_service.h"
12
13class NotificationPromo;
14class PrefRegistrySimple;
15class PrefService;
16
17namespace base {
18class DictionaryValue;
19}
20
21namespace user_prefs {
22class PrefRegistrySyncable;
23}
24
25// A PromoResourceService fetches data from a web resource server to be used to
26// dynamically change the appearance of the New Tab Page. For example, it has
27// been used to fetch "tips" to be displayed on the NTP, or to display
28// promotional messages to certain groups of Chrome users.
29class PromoResourceService : public WebResourceService {
30 public:
31  static void RegisterPrefs(PrefRegistrySimple* registry);
32  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
33  static void MigrateUserPrefs(PrefService* user_prefs);
34
35  PromoResourceService();
36
37 private:
38  virtual ~PromoResourceService();
39
40  // Schedule a notification that a web resource is either going to become
41  // available or be no longer valid.
42  void ScheduleNotification(const NotificationPromo& notification_promo);
43
44  // Schedules the initial notification for when the web resource is going
45  // to become available or no longer valid. This performs a few additional
46  // checks than ScheduleNotification, namely it schedules updates immediately
47  // if the promo service or Chrome locale has changed.
48  void ScheduleNotificationOnInit();
49
50  // If delay_ms is positive, schedule notification with the delay.
51  // If delay_ms is 0, notify immediately by calling WebResourceStateChange().
52  // If delay_ms is negative, do nothing.
53  void PostNotification(int64 delay_ms);
54
55  // Notify listeners that the state of a web resource has changed.
56  void PromoResourceStateChange();
57
58  // WebResourceService override to process the parsed information.
59  virtual void Unpack(const base::DictionaryValue& parsed_json) OVERRIDE;
60
61  // Allows the creation of tasks to send a notification.
62  // This allows the PromoResourceService to notify the New Tab Page immediately
63  // when a new web resource should be shown or removed.
64  base::WeakPtrFactory<PromoResourceService> weak_ptr_factory_;
65
66  DISALLOW_COPY_AND_ASSIGN(PromoResourceService);
67};
68
69#endif  // CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
70