chrome/browser/autocomplete/shortcuts_backend.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_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_
   6 #define CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/files/file_path.h"
  13 #include "base/gtest_prod_util.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/observer_list.h"
  17 #include "base/scoped_observer.h"
  18 #include "base/strings/string16.h"
  19 #include "base/synchronization/lock.h"
  20 #include "base/time/time.h"
  21 #include "chrome/browser/autocomplete/shortcuts_database.h"
  22 #include "components/history/core/browser/history_service_observer.h"
  23 #include "components/keyed_service/core/refcounted_keyed_service.h"
  24 #include "components/omnibox/autocomplete_match.h"
  25 #include "content/public/browser/notification_observer.h"
  26 #include "content/public/browser/notification_registrar.h"
  27 #include "url/gurl.h"
  28
  29 class Profile;
  30
  31 namespace history {
  32 class ShortcutsDatabase;
  33 };  // namespace history
  34
  35 // This class manages the shortcut provider backend - access to database on the
  36 // db thread, etc.
  37 class ShortcutsBackend : public RefcountedKeyedService,
  38                          public content::NotificationObserver,
  39                          public history::HistoryServiceObserver {
  40  public:
  41   typedef std::multimap<base::string16, const ShortcutsDatabase::Shortcut>
  42       ShortcutMap;
  43
  44   // |profile| is necessary for profile notifications only and can be NULL in
  45   // unit-tests. For unit testing, set |suppress_db| to true to prevent creation
  46   // of the database, in which case all operations are performed in memory only.
  47   ShortcutsBackend(Profile* profile, bool suppress_db);
  48
  49   // The interface is guaranteed to be called on the thread AddObserver()
  50   // was called.
  51   class ShortcutsBackendObserver {
  52    public:
  53     // Called after the database is loaded and Init() completed.
  54     virtual void OnShortcutsLoaded() = 0;
  55     // Called when shortcuts changed (added/updated/removed) in the database.
  56     virtual void OnShortcutsChanged() {}
  57
  58    protected:
  59     virtual ~ShortcutsBackendObserver() {}
  60   };
  61
  62   // Asynchronously initializes the ShortcutsBackend, it is safe to call
  63   // multiple times - only the first call will be processed.
  64   bool Init();
  65
  66   // All of the public functions *must* be called on UI thread only!
  67
  68   bool initialized() const { return current_state_ == INITIALIZED; }
  69   const ShortcutMap& shortcuts_map() const { return shortcuts_map_; }
  70
  71   // Deletes the Shortcuts with the url.
  72   bool DeleteShortcutsWithURL(const GURL& shortcut_url);
  73
  74   void AddObserver(ShortcutsBackendObserver* obs);
  75   void RemoveObserver(ShortcutsBackendObserver* obs);
  76
  77   // Looks for an existing shortcut to match.destination_url that starts with
  78   // |text|.  Updates that shortcut if found, otherwise adds a new shortcut.
  79   void AddOrUpdateShortcut(const base::string16& text,
  80                            const AutocompleteMatch& match);
  81
  82  private:
  83   friend class base::RefCountedThreadSafe<ShortcutsBackend>;
  84   friend class ShortcutsProviderTest;
  85   friend class ShortcutsBackendTest;
  86   FRIEND_TEST_ALL_PREFIXES(ShortcutsBackendTest, EntitySuggestionTest);
  87
  88   enum CurrentState {
  89     NOT_INITIALIZED,  // Backend created but not initialized.
  90     INITIALIZING,     // Init() called, but not completed yet.
  91     INITIALIZED,      // Initialization completed, all accessors can be safely
  92                       // called.
  93   };
  94
  95   typedef std::map<std::string, ShortcutMap::iterator> GuidMap;
  96
  97   ~ShortcutsBackend() override;
  98
  99   static ShortcutsDatabase::Shortcut::MatchCore MatchToMatchCore(
 100       const AutocompleteMatch& match,
 101       Profile* profile);
 102
 103   // RefcountedKeyedService:
 104   void ShutdownOnUIThread() override;
 105
 106   // content::NotificationObserver:
 107   void Observe(int type,
 108                const content::NotificationSource& source,
 109                const content::NotificationDetails& details) override;
 110
 111   // history::HistoryServiceObserver:
 112   void OnURLsDeleted(history::HistoryService* history_service,
 113                      bool all_history,
 114                      bool expired,
 115                      const history::URLRows& deleted_rows,
 116                      const std::set<GURL>& favicon_urls) override;
 117
 118   // Internal initialization of the back-end. Posted by Init() to the DB thread.
 119   // On completion posts InitCompleted() back to UI thread.
 120   void InitInternal();
 121
 122   // Finishes initialization on UI thread, notifies all observers.
 123   void InitCompleted();
 124
 125   // Adds the Shortcut to the database.
 126   bool AddShortcut(const ShortcutsDatabase::Shortcut& shortcut);
 127
 128   // Updates timing and selection count for the Shortcut.
 129   bool UpdateShortcut(const ShortcutsDatabase::Shortcut& shortcut);
 130
 131   // Deletes the Shortcuts with these IDs.
 132   bool DeleteShortcutsWithIDs(
 133       const ShortcutsDatabase::ShortcutIDs& shortcut_ids);
 134
 135   // Deletes all shortcuts whose URLs begin with |url|.  If |exact_match| is
 136   // true, only shortcuts from exactly |url| are deleted.
 137   bool DeleteShortcutsWithURL(const GURL& url, bool exact_match);
 138
 139   // Deletes all of the shortcuts.
 140   bool DeleteAllShortcuts();
 141
 142   Profile* profile_;
 143   CurrentState current_state_;
 144   ObserverList<ShortcutsBackendObserver> observer_list_;
 145   scoped_refptr<ShortcutsDatabase> db_;
 146
 147   // The |temp_shortcuts_map_| and |temp_guid_map_| used for temporary storage
 148   // between InitInternal() and InitComplete() to avoid doing a potentially huge
 149   // copy.
 150   scoped_ptr<ShortcutMap> temp_shortcuts_map_;
 151   scoped_ptr<GuidMap> temp_guid_map_;
 152
 153   ShortcutMap shortcuts_map_;
 154   // This is a helper map for quick access to a shortcut by guid.
 155   GuidMap guid_map_;
 156
 157   content::NotificationRegistrar notification_registrar_;
 158   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
 159       history_service_observer_;
 160
 161   // For some unit-test only.
 162   bool no_db_access_;
 163
 164   DISALLOW_COPY_AND_ASSIGN(ShortcutsBackend);
 165 };
 166
 167 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_BACKEND_H_