Prefetch cache pt1 - MRU

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all autocomplete entries that start with "Search <engine>
 // for ...", including searching for the current input string, search
 // history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "chrome/browser/autocomplete/answers_cache.h"
 #include "chrome/browser/autocomplete/base_search_provider.h"
 #include "components/metrics/proto/omnibox_input_type.pb.h"
 #include "components/search_engines/template_url.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
 class AutocompleteProviderListener;
 class AutocompleteResult;
 class Profile;
 class SearchProviderTest;
 class TemplateURLService;
@@ skipping 100 matching lines @@
     // Cached across the life of a query so we behave consistently even if the
     // user changes their default while the query is running.
     base::string16 default_provider_;
     base::string16 keyword_provider_;
 
     DISALLOW_COPY_AND_ASSIGN(Providers);
   };
 
   class CompareScoredResults;
 
-  struct AnswersQueryData {
-    base::string16 full_query_text;
-    base::string16 query_type;
-  };
-
   typedef std::vector<history::KeywordSearchTermVisit> HistoryResults;
 
   // Removes non-inlineable results until either the top result can inline
   // autocomplete the current input or verbatim outscores the top result.
   static void RemoveStaleResults(
       const base::string16& input,
       int verbatim_relevance,
       SearchSuggestionParser::SuggestResults* suggest_results,
       SearchSuggestionParser::NavigationResults* navigation_results);
 
@@ skipping 201 matching lines @@
   SearchSuggestionParser::Results default_results_;
   SearchSuggestionParser::Results keyword_results_;
 
   GURL current_page_url_;
 
   // Session token management.
   std::string current_token_;
   base::TimeTicks token_expiration_time_;
 
   // Answers prefetch management.
-  AnswersQueryData prefetch_data_;     // Data to use for query prefetching.
-  AnswersQueryData last_answer_seen_;  // Last answer seen.
+  AnswersCache answers_cache_;  // Cache for last answers seen.
+  AnswersQueryData prefetch_data_;  // Data to use for query prefetching.
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_