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      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/debug/trace_event.h"
      8 #include "base/sys_info.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 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   CHECK(g_browser_process->prerender_tracker());
     61   if (base::SysInfo::IsLowEndDevice())
     62     return NULL;
     63 
     64   PrerenderManager* prerender_manager = new PrerenderManager(
     65       profile, g_browser_process->prerender_tracker());
     66   return prerender_manager;
     67 }
     68 
     69 content::BrowserContext* PrerenderManagerFactory::GetBrowserContextToUse(
     70     content::BrowserContext* context) const {
     71   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
     72 }
     73 
     74 }  // namespace prerender
     75