chrome/browser/predictors/autocomplete_action_predictor_table.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_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_
   6 #define CHROME_BROWSER_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/strings/string16.h"
  12 #include "chrome/browser/predictors/predictor_table_base.h"
  13 #include "url/gurl.h"
  14
  15 namespace predictors {
  16
  17 // This manages the autocomplete predictor table within the SQLite database
  18 // passed in to the constructor. It expects the following scheme:
  19 //
  20 // network_action_predictor
  21 //   id                 A unique id.
  22 //   user_text          What the user typed.
  23 //   url                The URL of the entry.
  24 //   number_of_hits     Number of times the entry was shown to the user and
  25 //                      selected.
  26 //   number_of_misses   Number of times the entry was shown to the user but not
  27 //                      selected.
  28 //
  29 // TODO(dominich): Consider adding this table to one of the history databases.
  30 // In memory is currently used, but adding to the on-disk visits database
  31 // would allow DeleteOldEntries to be cheaper through use of a join.
  32 //
  33 // All the functions apart from constructor and destructor have to be called in
  34 // the DB thread.
  35 class AutocompleteActionPredictorTable : public PredictorTableBase {
  36  public:
  37   struct Row {
  38     // TODO(dominich): Make this 64-bit integer as an optimization. This
  39     // requires some investigation into how to make sure the id is unique for
  40     // each user_text/url pair.
  41     // http://crbug.com/102020
  42     typedef std::string Id;
  43
  44     Row();
  45
  46     // Only used by unit tests.
  47     Row(const Id& id,
  48         const base::string16& user_text,
  49         const GURL& url,
  50         int number_of_hits,
  51         int number_of_misses);
  52
  53     Row(const Row& row);
  54
  55     Id id;
  56     base::string16 user_text;
  57     GURL url;
  58     int number_of_hits;
  59     int number_of_misses;
  60   };
  61
  62   typedef std::vector<Row> Rows;
  63
  64   // DB thread functions.
  65   void GetRow(const Row::Id& id, Row* row);
  66   void GetAllRows(Rows* row_buffer);
  67   void AddRow(const Row& row);
  68   void UpdateRow(const Row& row);
  69   void AddAndUpdateRows(const Rows& rows_to_add, const Rows& rows_to_update);
  70   void DeleteRows(const std::vector<Row::Id>& id_list);
  71   void DeleteAllRows();
  72
  73  private:
  74   friend class PredictorDatabaseInternal;
  75
  76   AutocompleteActionPredictorTable();
  77   ~AutocompleteActionPredictorTable() override;
  78
  79   // PredictorTableBase methods (DB thread).
  80   void CreateTableIfNonExistent() override;
  81   void LogDatabaseStats() override;
  82
  83   DISALLOW_COPY_AND_ASSIGN(AutocompleteActionPredictorTable);
  84 };
  85
  86 }  // namespace predictors
  87
  88 #endif  // CHROME_BROWSER_PREDICTORS_AUTOCOMPLETE_ACTION_PREDICTOR_TABLE_H_