predictors: Add prefetching hit/miss histograms.

chrome/browser/predictors/resource_prefetch_predictor.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 #define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 25 matching lines @@
 class URLRequest;
 }
 
 namespace predictors {
 
 namespace internal {
 constexpr char kResourcePrefetchPredictorPrecisionHistogram[] =
     "ResourcePrefetchPredictor.LearningPrecision";
 constexpr char kResourcePrefetchPredictorRecallHistogram[] =
     "ResourcePrefetchPredictor.LearningRecall";
+constexpr char kResourcePrefetchPredictorPrefetchMissesCountCached[] =
+    "ResourcePrefetchPredictor.PrefetchMissesCount.Cached";
+constexpr char kResourcePrefetchPredictorPrefetchMissesCountNotCached[] =
+    "ResourcePrefetchPredictor.PrefetchMissesCount.NotCached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsCountCached[] =
+    "ResourcePrefetchPredictor.PrefetchHitsCount.Cached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsCountNotCached[] =
+    "ResourcePrefetchPredictor.PrefetchHitsCount.NotCached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsSize[] =
+    "ResourcePrefetchPredictor.PrefetchHitsSizeKB";
+constexpr char kResourcePrefetchPredictorPrefetchMissesSize[] =
+    "ResourcePrefetchPredictor.PrefetchMissesSizeKB";
+
 }  // namespace internal
 
 class TestObserver;
 class ResourcePrefetcherManager;
 
 // Contains logic for learning what can be prefetched and for kicking off
 // speculative prefetching.
 // - The class is a profile keyed service owned by the profile.
 // - All the non-static methods of this class need to be called on the UI
 //   thread.
@@ skipping 107 matching lines @@
   // Starts prefetching if it is enabled for |origin| and prefetching data
   // exists for the |main_frame_url| either at the URL or at the host level.
   void StartPrefetching(const GURL& main_frame_url, PrefetchOrigin origin);
 
   // Stops prefetching that may be in progress corresponding to
   // |main_frame_url|.
   void StopPrefetching(const GURL& main_frame_url);
 
   // Called when ResourcePrefetcher is finished, i.e. there is nothing pending
   // in flight.
-  void OnPrefetchingFinished(const GURL& main_frame_url);
+  void OnPrefetchingFinished(const GURL& main_frame_url,
+                             const ResourcePrefetcher::PrefetcherStats& stats);
 
   // Returns true if prefetching data exists for the |main_frame_url|.
   virtual bool IsUrlPrefetchable(const GURL& main_frame_url);
 
   // Sets the |observer| to be notified when the resource prefetch predictor
   // data changes. Previously registered observer will be discarded. Call
   // this with nullptr parameter to de-register observer.
   void SetObserverForTesting(TestObserver* observer);
 
  private:
@@ skipping 25 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ResourcePrefetchPredictorTest, GetRedirectEndpoint);
   FRIEND_TEST_ALL_PREFIXES(ResourcePrefetchPredictorTest, GetPrefetchData);
   FRIEND_TEST_ALL_PREFIXES(ResourcePrefetchPredictorTest,
                            TestPrecisionRecallHistograms);
 
   enum InitializationState {
     NOT_INITIALIZED = 0,
     INITIALIZING = 1,
     INITIALIZED = 2
   };
-
   typedef ResourcePrefetchPredictorTables::PrefetchDataMap PrefetchDataMap;
   typedef ResourcePrefetchPredictorTables::RedirectDataMap RedirectDataMap;
 
   typedef std::map<NavigationID, std::unique_ptr<PageRequestSummary>>
       NavigationMap;
 
   // Returns true if the main page request is supported for prediction.
   static bool IsHandledMainPage(net::URLRequest* request);
 
   // Returns true if the subresource request is supported for prediction.
@@ skipping 129 matching lines @@
   base::CancelableTaskTracker history_lookup_consumer_;
 
   // Copy of the data in the predictor tables.
   std::unique_ptr<PrefetchDataMap> url_table_cache_;
   std::unique_ptr<PrefetchDataMap> host_table_cache_;
   std::unique_ptr<RedirectDataMap> url_redirect_table_cache_;
   std::unique_ptr<RedirectDataMap> host_redirect_table_cache_;
 
   NavigationMap inflight_navigations_;
 
+  std::map<GURL, ResourcePrefetcher::PrefetcherStats> prefetcher_stats_;
+
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
 
 // An interface used to notify that data in the ResourcePrefetchPredictor
 // has changed. All methods are invoked on the UI thread.
 class TestObserver {
  public:
   // De-registers itself from |predictor_| on destruction.
   virtual ~TestObserver();
 
   virtual void OnNavigationLearned(
       size_t url_visit_count,
       const ResourcePrefetchPredictor::PageRequestSummary& summary) {}
 
-  virtual void OnPrefetchingFinished(const GURL& main_frame_url) {}
+  virtual void OnPrefetchingFinished(
+      const GURL& main_frame_url,
+      const ResourcePrefetcher::PrefetcherStats& stats) {}
 
   virtual void OnPredictorInitialized() {}
 
  protected:
   // |predictor| must be non-NULL and has to outlive the TestObserver.
   // Also the predictor must not have a TestObserver set.
   explicit TestObserver(ResourcePrefetchPredictor* predictor);
 
  private:
   ResourcePrefetchPredictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestObserver);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_