chrome/browser/prerender/prerender_manager_factory.cc

   1 // Copyright (c) 2012 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/prerender/prerender_manager_factory.h"
   6
   7 #include "base/sys_info.h"
   8 #include "base/trace_event/trace_event.h"
   9 #include "chrome/browser/browser_process.h"
  10 #include "chrome/browser/history/history_service_factory.h"
  11 #include "chrome/browser/predictors/predictor_database_factory.h"
  12 #include "chrome/browser/prerender/prerender_manager.h"
  13 #include "chrome/browser/profiles/incognito_helpers.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/browser/sync/profile_sync_service_factory.h"
  16 #include "components/keyed_service/content/browser_context_dependency_manager.h"
  17
  18 #if defined(ENABLE_EXTENSIONS)
  19 #include "extensions/browser/extension_system_provider.h"
  20 #include "extensions/browser/extensions_browser_client.h"
  21 #endif
  22
  23 namespace prerender {
  24
  25 // static
  26 PrerenderManager* PrerenderManagerFactory::GetForProfile(
  27     Profile* profile) {
  28   TRACE_EVENT0("browser", "PrerenderManagerFactory::GetForProfile")
  29   if (!PrerenderManager::IsPrerenderingPossible())
  30     return NULL;
  31   return static_cast<PrerenderManager*>(
  32       GetInstance()->GetServiceForBrowserContext(profile, true));
  33 }
  34
  35 // static
  36 PrerenderManagerFactory* PrerenderManagerFactory::GetInstance() {
  37   return base::Singleton<PrerenderManagerFactory>::get();
  38 }
  39
  40 PrerenderManagerFactory::PrerenderManagerFactory()
  41     : BrowserContextKeyedServiceFactory(
  42         "PrerenderManager",
  43         BrowserContextDependencyManager::GetInstance()) {
  44 #if defined(ENABLE_EXTENSIONS)
  45   DependsOn(
  46       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
  47 #endif
  48   // PrerenderLocalPredictor observers the history visit DB.
  49   DependsOn(HistoryServiceFactory::GetInstance());
  50   DependsOn(predictors::PredictorDatabaseFactory::GetInstance());
  51   DependsOn(ProfileSyncServiceFactory::GetInstance());
  52 }
  53
  54 PrerenderManagerFactory::~PrerenderManagerFactory() {
  55 }
  56
  57 KeyedService* PrerenderManagerFactory::BuildServiceInstanceFor(
  58     content::BrowserContext* browser_context) const {
  59   Profile* profile = Profile::FromBrowserContext(browser_context);
  60   if (base::SysInfo::IsLowEndDevice())
  61     return NULL;
  62
  63   return new PrerenderManager(profile);
  64 }
  65
  66 content::BrowserContext* PrerenderManagerFactory::GetBrowserContextToUse(
  67     content::BrowserContext* context) const {
  68   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
  69 }
  70
  71 }  // namespace prerender