1 // Copyright (c) 2011 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_HISTORY_TOP_SITES_BACKEND_H_ 6 #define CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_ 7 8 #include "base/callback.h" 9 #include "base/files/file_path.h" 10 #include "base/memory/ref_counted.h" 11 #include "base/memory/scoped_ptr.h" 12 #include "components/history/core/browser/history_types.h" 13 14 namespace base { 15 class CancelableTaskTracker; 16 class FilePath; 17 } 18 19 namespace history { 20 21 class TopSitesDatabase; 22 23 // Service used by TopSites to have db interaction happen on the DB thread. All 24 // public methods are invoked on the ui thread and get funneled to the DB 25 // thread. 26 class TopSitesBackend : public base::RefCountedThreadSafe<TopSitesBackend> { 27 public: 28 // The boolean parameter indicates if the DB existed on disk or needs to be 29 // migrated. 30 typedef base::Callback<void(const scoped_refptr<MostVisitedThumbnails>&)> 31 GetMostVisitedThumbnailsCallback; 32 33 TopSitesBackend(); 34 35 void Init(const base::FilePath& path); 36 37 // Schedules the db to be shutdown. 38 void Shutdown(); 39 40 // Fetches MostVisitedThumbnails. 41 void GetMostVisitedThumbnails( 42 const GetMostVisitedThumbnailsCallback& callback, 43 base::CancelableTaskTracker* tracker); 44 45 // Updates top sites database from the specified delta. 46 void UpdateTopSites(const TopSitesDelta& delta); 47 48 // Sets the thumbnail. 49 void SetPageThumbnail(const MostVisitedURL& url, 50 int url_rank, 51 const Images& thumbnail); 52 53 // Deletes the database and recreates it. 54 void ResetDatabase(); 55 56 // Schedules a request that does nothing on the DB thread, but then notifies 57 // the the calling thread with a reply. This is used to make sure the db has 58 // finished processing a request. 59 void DoEmptyRequest(const base::Closure& reply, 60 base::CancelableTaskTracker* tracker); 61 62 private: 63 friend class base::RefCountedThreadSafe<TopSitesBackend>; 64 65 virtual ~TopSitesBackend(); 66 67 // Invokes Init on the db_. 68 void InitDBOnDBThread(const base::FilePath& path); 69 70 // Shuts down the db. 71 void ShutdownDBOnDBThread(); 72 73 // Does the work of getting the most visted thumbnails. 74 void GetMostVisitedThumbnailsOnDBThread( 75 scoped_refptr<MostVisitedThumbnails> thumbnails); 76 77 // Updates top sites. 78 void UpdateTopSitesOnDBThread(const TopSitesDelta& delta); 79 80 // Sets the thumbnail. 81 void SetPageThumbnailOnDBThread(const MostVisitedURL& url, 82 int url_rank, 83 const Images& thumbnail); 84 85 // Resets the database. 86 void ResetDatabaseOnDBThread(const base::FilePath& file_path); 87 88 base::FilePath db_path_; 89 90 scoped_ptr<TopSitesDatabase> db_; 91 92 DISALLOW_COPY_AND_ASSIGN(TopSitesBackend); 93 }; 94 95 } // namespace history 96 97 #endif // CHROME_BROWSER_HISTORY_TOP_SITES_BACKEND_H_ 98