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39 40 // Schedule a notification that a web resource is either going to become 41 // available or be no longer valid. 42 void ScheduleNotification(const NotificationPromo& notification_promo); 43 44 // Schedules the initial notification for when the web resource is going 45 // to become available or no longer valid.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_ 70