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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 #include "chrome/browser/net/net_pref_observer.h"
      6 
      7 #include "base/task.h"
      8 #include "chrome/browser/net/predictor_api.h"
      9 #include "chrome/browser/prefs/pref_service.h"
     10 #include "chrome/browser/prerender/prerender_manager.h"
     11 #include "chrome/browser/profiles/profile.h"
     12 #include "chrome/common/pref_names.h"
     13 #include "content/browser/browser_thread.h"
     14 #include "content/common/notification_type.h"
     15 #include "content/common/notification_details.h"
     16 #include "net/http/http_stream_factory.h"
     17 #include "net/url_request/url_request_throttler_manager.h"
     18 
     19 namespace {
     20 
     21 // Function (for NewRunnableFunction) to call the set_enforce_throttling
     22 // member on the URLRequestThrottlerManager singleton.
     23 void SetEnforceThrottlingOnThrottlerManager(bool enforce) {
     24   net::URLRequestThrottlerManager::GetInstance()->set_enforce_throttling(
     25       enforce);
     26 }
     27 
     28 }
     29 
     30 NetPrefObserver::NetPrefObserver(PrefService* prefs,
     31                                  prerender::PrerenderManager* prerender_manager)
     32     : prerender_manager_(prerender_manager) {
     33   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     34   DCHECK(prefs);
     35   network_prediction_enabled_.Init(prefs::kNetworkPredictionEnabled, prefs,
     36                                    this);
     37   spdy_disabled_.Init(prefs::kDisableSpdy, prefs, this);
     38   http_throttling_enabled_.Init(prefs::kHttpThrottlingEnabled, prefs, this);
     39 
     40   ApplySettings(NULL);
     41 }
     42 
     43 NetPrefObserver::~NetPrefObserver() {
     44   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     45 }
     46 
     47 void NetPrefObserver::Observe(NotificationType type,
     48                               const NotificationSource& source,
     49                               const NotificationDetails& details) {
     50   DCHECK_EQ(type.value, NotificationType::PREF_CHANGED);
     51 
     52   std::string* pref_name = Details<std::string>(details).ptr();
     53   ApplySettings(pref_name);
     54 }
     55 
     56 void NetPrefObserver::ApplySettings(const std::string* pref_name) {
     57   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     58 
     59   chrome_browser_net::EnablePredictor(*network_prediction_enabled_);
     60   if (prerender_manager_)
     61     prerender_manager_->set_enabled(*network_prediction_enabled_);
     62   net::HttpStreamFactory::set_spdy_enabled(!*spdy_disabled_);
     63 
     64   if (!pref_name || *pref_name == prefs::kHttpThrottlingEnabled) {
     65     BrowserThread::PostTask(
     66         BrowserThread::IO, FROM_HERE,
     67         NewRunnableFunction(SetEnforceThrottlingOnThrottlerManager,
     68                             *http_throttling_enabled_));
     69   }
     70 }
     71 
     72 // static
     73 void NetPrefObserver::RegisterPrefs(PrefService* prefs) {
     74   prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled, true);
     75   prefs->RegisterBooleanPref(prefs::kDisableSpdy, false);
     76   prefs->RegisterBooleanPref(prefs::kHttpThrottlingEnabled, false);
     77 }
     78