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      1 // Copyright (c) 2011 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_NET_NET_PREF_OBSERVER_H_
      6 #define CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "base/basictypes.h"
     12 #include "chrome/browser/prefs/pref_member.h"
     13 #include "content/common/notification_observer.h"
     14 
     15 class Profile;
     16 
     17 namespace prerender {
     18 class PrerenderManager;
     19 }
     20 
     21 // Monitors network-related preferences for changes and applies them.
     22 // The supplied PrefService must outlive this NetPrefObserver.
     23 // Must be used only on the UI thread.
     24 class NetPrefObserver : public NotificationObserver {
     25  public:
     26   // |prefs| must outlive this NetPrefObserver. A reference is
     27   // held to |prerender_manager| if it is non-NULL.
     28   NetPrefObserver(PrefService* prefs,
     29                   prerender::PrerenderManager* prerender_manager);
     30   ~NetPrefObserver();
     31 
     32   // NotificationObserver
     33   virtual void Observe(NotificationType type,
     34                        const NotificationSource& source,
     35                        const NotificationDetails& details);
     36 
     37   static void RegisterPrefs(PrefService* prefs);
     38 
     39  private:
     40   // If |pref_name| is NULL, all monitored preferences will be applied.
     41   void ApplySettings(const std::string* pref_name);
     42 
     43   BooleanPrefMember network_prediction_enabled_;
     44   BooleanPrefMember spdy_disabled_;
     45   BooleanPrefMember http_throttling_enabled_;
     46   scoped_refptr<prerender::PrerenderManager> prerender_manager_;
     47 
     48   DISALLOW_COPY_AND_ASSIGN(NetPrefObserver);
     49 };
     50 
     51 #endif  // CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_
     52 
     53