extensions/browser/renderer_startup_helper.h

   1 // Copyright 2014 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 EXTENSIONS_BROWSER_RENDERER_STARTUP_HELPER_H_
   6 #define EXTENSIONS_BROWSER_RENDERER_STARTUP_HELPER_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/singleton.h"
  10 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  11 #include "components/keyed_service/core/keyed_service.h"
  12 #include "content/public/browser/notification_observer.h"
  13 #include "content/public/browser/notification_registrar.h"
  14
  15 namespace content {
  16 class BrowserContext;
  17 class RenderProcessHost;
  18 }
  19
  20 namespace extensions {
  21
  22 // Informs renderers about extensions-related data (loaded extensions, available
  23 // functions, etc.) when they start. Sends this information to both extension
  24 // and non-extension renderers, as the non-extension renderers may have content
  25 // scripts. Lives on the UI thread. Shared between incognito and non-incognito
  26 // browser contexts.
  27 class RendererStartupHelper : public KeyedService,
  28                               public content::NotificationObserver {
  29  public:
  30   // This class sends messages to all renderers started for |browser_context|.
  31   explicit RendererStartupHelper(content::BrowserContext* browser_context);
  32   ~RendererStartupHelper() override;
  33
  34   // content::NotificationObserver overrides:
  35   void Observe(int type,
  36                const content::NotificationSource& source,
  37                const content::NotificationDetails& details) override;
  38
  39  private:
  40   content::BrowserContext* browser_context_;  // Not owned.
  41
  42   content::NotificationRegistrar registrar_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(RendererStartupHelper);
  45 };
  46
  47 // Factory for RendererStartupHelpers. Declared here because this header is
  48 // rarely included and it's probably cheaper to put it here than to make the
  49 // compiler generate another object file.
  50 class RendererStartupHelperFactory : public BrowserContextKeyedServiceFactory {
  51  public:
  52   static RendererStartupHelper* GetForBrowserContext(
  53       content::BrowserContext* context);
  54   static RendererStartupHelperFactory* GetInstance();
  55
  56  private:
  57   friend struct DefaultSingletonTraits<RendererStartupHelperFactory>;
  58
  59   RendererStartupHelperFactory();
  60   ~RendererStartupHelperFactory() override;
  61
  62   // BrowserContextKeyedServiceFactory implementation:
  63   KeyedService* BuildServiceInstanceFor(
  64       content::BrowserContext* profile) const override;
  65   content::BrowserContext* GetBrowserContextToUse(
  66       content::BrowserContext* context) const override;
  67   bool ServiceIsCreatedWithBrowserContext() const override;
  68
  69   DISALLOW_COPY_AND_ASSIGN(RendererStartupHelperFactory);
  70 };
  71
  72 }  // namespace extensions
  73
  74 #endif  // EXTENSIONS_BROWSER_RENDERER_STARTUP_HELPER_H_