chrome/browser/web_resource/promo_resource_service.h

   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
  13 class NotificationPromo;
  14 class PrefRegistrySimple;
  15 class PrefService;
  16
  17 namespace base {
  18 class DictionaryValue;
  19 }
  20
  21 namespace user_prefs {
  22 class 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.
  29 class 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  41   // available or be no longer valid.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  45   // to become available or no longer valid.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_