extensions/browser/api/usb/usb_event_router.h

   1 // Copyright 2015 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_API_USB_USB_EVENT_ROUTER_H_
   6 #define EXTENSIONS_BROWSER_API_USB_USB_EVENT_ROUTER_H_
   7
   8 #include "content/public/browser/browser_thread.h"
   9 #include "device/usb/usb_service.h"
  10 #include "extensions/browser/browser_context_keyed_api_factory.h"
  11 #include "extensions/browser/event_router.h"
  12
  13 namespace device {
  14 class UsbDevice;
  15 }
  16
  17 namespace extensions {
  18
  19 // A BrowserContext-scoped object which is registered as an observer of the
  20 // EventRouter and UsbService in order to generate device add/remove events.
  21 class UsbEventRouter : public BrowserContextKeyedAPI,
  22                        public EventRouter::Observer,
  23                        public device::UsbService::Observer {
  24  public:
  25   // BrowserContextKeyedAPI implementation.
  26   static BrowserContextKeyedAPIFactory<UsbEventRouter>* GetFactoryInstance();
  27
  28  private:
  29   friend class BrowserContextKeyedAPIFactory<UsbEventRouter>;
  30
  31   explicit UsbEventRouter(content::BrowserContext* context);
  32   ~UsbEventRouter() override;
  33
  34   // BrowserContextKeyedAPI implementation.
  35   static const char* service_name() { return "UsbEventRouter"; }
  36   static const bool kServiceIsNULLWhileTesting = true;
  37
  38   // KeyedService implementation.
  39   void Shutdown() override;
  40
  41   // EventRouter::Observer implementation.
  42   void OnListenerAdded(const EventListenerInfo& details) override;
  43
  44   // UsbService::Observer implementation.
  45   void OnDeviceAdded(scoped_refptr<device::UsbDevice> device) override;
  46   void OnDeviceRemoved(scoped_refptr<device::UsbDevice> device) override;
  47
  48   // Broadcasts a device add or remove event for the given device.
  49   void DispatchEvent(const std::string& event_name,
  50                      scoped_refptr<device::UsbDevice> device);
  51
  52   content::BrowserContext* const browser_context_;
  53
  54   ScopedObserver<device::UsbService, device::UsbService::Observer> observer_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(UsbEventRouter);
  57 };
  58
  59 template <>
  60 void BrowserContextKeyedAPIFactory<
  61     UsbEventRouter>::DeclareFactoryDependencies();
  62
  63 }  // namespace extensions
  64
  65 #endif  // EXTENSIONS_BROWSER_API_USB_USB_EVENT_ROUTER_H_