chrome/browser/network_time/navigation_time_helper.h

   1 // Copyright 2013 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_NETWORK_TIME_NAVIGATION_TIME_HELPER_H_
   6 #define CHROME_BROWSER_NETWORK_TIME_NAVIGATION_TIME_HELPER_H_
   7
   8 #include <map>
   9
  10 #include "base/time/time.h"
  11 #include "content/public/browser/notification_observer.h"
  12 #include "content/public/browser/notification_registrar.h"
  13 #include "content/public/browser/web_contents_user_data.h"
  14
  15 namespace content {
  16 class WebContents;
  17 }
  18
  19 // NavigationTimeHelper returns the navigation time in network time for
  20 // given navigation entry.
  21 class NavigationTimeHelper
  22     : public content::NotificationObserver,
  23       public content::WebContentsUserData<NavigationTimeHelper> {
  24  public:
  25   virtual ~NavigationTimeHelper();
  26
  27   base::Time GetNavigationTime(const content::NavigationEntry* entry);
  28
  29  protected:
  30   // Tests only.
  31   NavigationTimeHelper();
  32
  33   // Return network time for given |local_time|.
  34   virtual base::Time GetNetworkTime(base::Time local_time);
  35
  36  private:
  37   explicit NavigationTimeHelper(content::WebContents* web_contents);
  38   friend class content::WebContentsUserData<NavigationTimeHelper>;
  39
  40   // content::NotificationObserver implementation.
  41   virtual void Observe(int type,
  42                        const content::NotificationSource& source,
  43                        const content::NotificationDetails& details) OVERRIDE;
  44
  45   content::NotificationRegistrar registrar_;
  46
  47   content::WebContents* web_contents_;
  48
  49   // Map from navigation entries to the navigation times calculated for them.
  50   struct NavigationTimeInfo {
  51     NavigationTimeInfo(base::Time local_time, base::Time network_time)
  52         : local_time(local_time), network_time(network_time) {}
  53     base::Time local_time;
  54     base::Time network_time;
  55   };
  56   typedef std::map<const void*, NavigationTimeInfo> NavigationTimeCache;
  57   NavigationTimeCache time_cache_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(NavigationTimeHelper);
  60 };
  61
  62 #endif  // CHROME_BROWSER_NETWORK_TIME_NAVIGATION_TIME_HELPER_H_