components/search_engines/keyword_web_data_service.h

   1 // Copyright 2014 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 COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__
   6 #define COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "components/search_engines/keyword_table.h"
  10 #include "components/search_engines/template_url_id.h"
  11 #include "components/webdata/common/web_data_service_base.h"
  12 #include "components/webdata/common/web_database.h"
  13
  14 namespace base {
  15 class SingleThreadTaskRunner;
  16 }
  17
  18 class WDTypedResult;
  19 class WebDatabaseService;
  20 struct TemplateURLData;
  21
  22 struct WDKeywordsResult {
  23   WDKeywordsResult();
  24   ~WDKeywordsResult();
  25
  26   KeywordTable::Keywords keywords;
  27   // Identifies the ID of the TemplateURL that is the default search. A value of
  28   // 0 indicates there is no default search provider.
  29   int64 default_search_provider_id;
  30   // Version of the built-in keywords. A value of 0 indicates a first run.
  31   int builtin_keyword_version;
  32 };
  33
  34 class WebDataServiceConsumer;
  35
  36 class KeywordWebDataService : public WebDataServiceBase {
  37  public:
  38   // Instantiate this to turn on batch mode on the provided |service|
  39   // until the scoper is destroyed.  When batch mode is on, calls to any of the
  40   // three keyword table modification functions below will result in locally
  41   // queueing the operation; on setting this back to false, all the
  42   // modifications will be performed at once.  This is a performance
  43   // optimization; see comments on KeywordTable::PerformOperations().
  44   //
  45   // If multiple scopers are in-scope simultaneously, batch mode will only be
  46   // exited when all are destroyed.  If |service| is NULL, the object will do
  47   // nothing.
  48   class BatchModeScoper {
  49    public:
  50     explicit BatchModeScoper(KeywordWebDataService* service);
  51     ~BatchModeScoper();
  52
  53    private:
  54     KeywordWebDataService* service_;
  55
  56     DISALLOW_COPY_AND_ASSIGN(BatchModeScoper);
  57   };
  58
  59   KeywordWebDataService(scoped_refptr<WebDatabaseService> wdbs,
  60                         scoped_refptr<base::SingleThreadTaskRunner> ui_thread,
  61                         const ProfileErrorCallback& callback);
  62
  63   // As the database processes requests at a later date, all deletion is
  64   // done on the background thread.
  65   //
  66   // Many of the keyword related methods do not return a handle. This is because
  67   // the caller (TemplateURLService) does not need to know when the request is
  68   // done.
  69
  70   void AddKeyword(const TemplateURLData& data);
  71   void RemoveKeyword(TemplateURLID id);
  72   void UpdateKeyword(const TemplateURLData& data);
  73
  74   // Fetches the keywords.
  75   // On success, consumer is notified with WDResult<KeywordTable::Keywords>.
  76   Handle GetKeywords(WebDataServiceConsumer* consumer);
  77
  78   // Sets the ID of the default search provider.
  79   void SetDefaultSearchProviderID(TemplateURLID id);
  80
  81   // Sets the version of the builtin keywords.
  82   void SetBuiltinKeywordVersion(int version);
  83
  84  protected:
  85   ~KeywordWebDataService() override;
  86
  87  private:
  88   // Called by the BatchModeScoper (see comments there).
  89   void AdjustBatchModeLevel(bool entering_batch_mode);
  90
  91   //////////////////////////////////////////////////////////////////////////////
  92   //
  93   // The following methods are only invoked on the DB thread.
  94   //
  95   //////////////////////////////////////////////////////////////////////////////
  96   WebDatabase::State PerformKeywordOperationsImpl(
  97       const KeywordTable::Operations& operations,
  98       WebDatabase* db);
  99   scoped_ptr<WDTypedResult> GetKeywordsImpl(WebDatabase* db);
 100   WebDatabase::State SetDefaultSearchProviderIDImpl(TemplateURLID id,
 101                                                     WebDatabase* db);
 102   WebDatabase::State SetBuiltinKeywordVersionImpl(int version, WebDatabase* db);
 103
 104   size_t batch_mode_level_;
 105   KeywordTable::Operations queued_keyword_operations_;
 106
 107   DISALLOW_COPY_AND_ASSIGN(KeywordWebDataService);
 108 };
 109
 110 #endif  // COMPONENTS_SEARCH_ENGINES_KEYWORD_WEB_DATA_SERVICE_H__