predictors: Refactor resource_prefetch_predictor triggering.

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>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "base/time/time.h"
 #include "chrome/browser/predictors/glowplug_key_value_data.h"
 #include "chrome/browser/predictors/loading_predictor_config.h"
 #include "chrome/browser/predictors/resource_prefetch_common.h"
 #include "chrome/browser/predictors/resource_prefetch_predictor_tables.h"
 #include "chrome/browser/predictors/resource_prefetcher.h"
+#include "chrome/browser/predictors/resource_prefetcher_manager.h"
 #include "components/history/core/browser/history_db_task.h"
 #include "components/history/core/browser/history_service_observer.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/precache/content/precache_manager.h"
 #include "content/public/common/resource_type.h"
 #include "url/gurl.h"
 
 class PredictorsHandler;
 class Profile;
@@ skipping 170 matching lines @@
     REDIRECT_WRONG_PREDICTED,
     REDIRECT_CORRECTLY_PREDICTED,
     MAX
   };
 
   ResourcePrefetchPredictor(const LoadingPredictorConfig& config,
                             Profile* profile);
   ~ResourcePrefetchPredictor() override;
 
   // Starts initialization by posting a task to the DB thread to read the
-  // predictor database.
-  void StartInitialization();
-  void Shutdown();
+  // predictor database. Virtual for testing.
+  virtual void StartInitialization();
+  virtual void Shutdown();
 
   // Thread safe.
   static bool ShouldRecordRequest(net::URLRequest* request,
                                   content::ResourceType resource_type);
   static bool ShouldRecordResponse(net::URLRequest* response);
   static bool ShouldRecordRedirect(net::URLRequest* response);
 
   // Determines the resource type from the declared one, falling back to MIME
   // type detection when it is not explicit.
   static content::ResourceType GetResourceType(
@@ skipping 21 matching lines @@
       const NavigationID& navigation_id,
       const base::TimeTicks& first_contentful_paint);
 
   // Called when ResourcePrefetcher is finished, i.e. there is nothing pending
   // in flight.
   void OnPrefetchingFinished(
       const GURL& main_frame_url,
       std::unique_ptr<ResourcePrefetcher::PrefetcherStats> stats);
 
   // Returns true if prefetching data exists for the |main_frame_url|.
-  virtual bool IsUrlPrefetchable(const GURL& main_frame_url);
+  virtual bool IsUrlPrefetchable(const GURL& main_frame_url) const;
 
   // Returns true iff |resource| has sufficient confidence level and required
   // number of hits.
   bool IsResourcePrefetchable(const ResourceData& resource) const;
 
   // precache::PrecacheManager::Delegate:
   void OnManifestFetched(const std::string& host,
                          const precache::PrecacheManifest& manifest) override;
 
   // 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:
-  // 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, HintOrigin origin);
+  // Starts prefetching if it is enabled 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);
 
   // Stops prefetching that may be in progress corresponding to
   // |main_frame_url|.
   void StopPrefetching(const GURL& main_frame_url);
 
   friend class LoadingPredictor;
   friend class ::PredictorsHandler;
   friend class ResourcePrefetchPredictorTest;
   friend class ResourcePrefetchPredictorBrowserTest;
 
@@ skipping 63 matching lines @@
                                     const std::string& mime_type);
 
   // Returns true if the request (should have a response in it) is "no-store".
   static bool IsNoStore(const net::URLRequest& request);
 
   static void SetAllowPortInUrlsForTesting(bool state);
 
   // Functions called on different network events pertaining to the loading of
   // main frame resource or sub resources.
   void OnMainFrameRequest(const URLRequestSummary& request);
-  void OnMainFrameResponse(const URLRequestSummary& response);
   void OnMainFrameRedirect(const URLRequestSummary& response);
   void OnSubresourceResponse(const URLRequestSummary& response);
   void OnSubresourceRedirect(const URLRequestSummary& response);
 
   // Called when onload completes for a navigation. We treat this point as the
   // "completion" of the navigation. The resources requested by the page up to
   // this point are the only ones considered for prefetching.
   void OnNavigationComplete(const NavigationID& nav_id_without_timing_info);
 
   // Returns true iff one of the following conditions is true
@@ skipping 24 matching lines @@
   // prefetched. |urls| may be nullptr to get the return value only.
   bool PopulateFromManifest(const std::string& manifest_host,
                             std::vector<GURL>* urls) const;
 
   void InitializeOnDBThread();
 
   // Called during initialization when history is read and the predictor
   // database has been read.
   void OnHistoryAndCacheLoaded();
 
-  // Cleanup inflight_navigations_, inflight_prefetches_, and prefetcher_stats_.
+  // Cleanup inflight_navigations_, and prefetcher_stats_.
   void CleanupAbandonedNavigations(const NavigationID& navigation_id);
 
   // Deletes all URLs from the predictor database, the caches and removes all
   // inflight navigations.
   void DeleteAllUrls();
 
   // Deletes data for the input |urls| and their corresponding hosts from the
   // predictor database and caches.
   void DeleteUrls(const history::URLRows& urls);
 
@@ skipping 37 matching lines @@
 
   // Used to connect to HistoryService or register for service loaded
   // notificatioan.
   void ConnectToHistoryService();
 
   // Used for testing to inject mock tables.
   void set_mock_tables(scoped_refptr<ResourcePrefetchPredictorTables> tables) {
     tables_ = tables;
   }
 
+  // For testing.
+  void set_mock_resource_prefetcher_manager(
+      scoped_refptr<ResourcePrefetcherManager> prefetch_manager) {
+    prefetch_manager_ = prefetch_manager;
+  }
+
   Profile* const profile_;
   TestObserver* observer_;
   const LoadingPredictorConfig config_;
   InitializationState initialization_state_;
   scoped_refptr<ResourcePrefetchPredictorTables> tables_;
   scoped_refptr<ResourcePrefetcherManager> prefetch_manager_;
   base::CancelableTaskTracker history_lookup_consumer_;
 
   std::unique_ptr<PrefetchDataMap> url_resource_data_;
   std::unique_ptr<PrefetchDataMap> host_resource_data_;
   std::unique_ptr<RedirectDataMap> url_redirect_data_;
   std::unique_ptr<RedirectDataMap> host_redirect_data_;
   std::unique_ptr<ManifestDataMap> manifest_data_;
   std::unique_ptr<OriginDataMap> origin_data_;
 
-  std::map<GURL, base::TimeTicks> inflight_prefetches_;
   NavigationMap inflight_navigations_;
 
   std::map<GURL, std::unique_ptr<ResourcePrefetcher::PrefetcherStats>>
       prefetcher_stats_;
 
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
@@ skipping 24 matching lines @@
 
  private:
   ResourcePrefetchPredictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestObserver);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_