device/devices_app/usb/device_manager_impl.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 DEVICE_USB_DEVICE_MANAGER_IMPL_H_
   6 #define DEVICE_USB_DEVICE_MANAGER_IMPL_H_
   7
   8 #include <queue>
   9 #include <set>
  10
  11 #include "base/containers/scoped_ptr_map.h"
  12 #include "base/macros.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "device/devices_app/usb/public/interfaces/device_manager.mojom.h"
  17 #include "third_party/mojo/src/mojo/public/cpp/bindings/array.h"
  18 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
  19 #include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
  20
  21 namespace base {
  22 class SequencedTaskRunner;
  23 }
  24
  25 namespace device {
  26
  27 class UsbDevice;
  28 class UsbDeviceFilter;
  29 class UsbDeviceHandle;
  30
  31 namespace usb {
  32
  33 class DeviceManagerDelegate;
  34
  35 // Implementation of the public DeviceManager interface. This interface can be
  36 // requested from the devices app located at "mojo:devices", if available.
  37 class DeviceManagerImpl : public DeviceManager {
  38  public:
  39   DeviceManagerImpl(
  40       mojo::InterfaceRequest<DeviceManager> request,
  41       scoped_ptr<DeviceManagerDelegate> delegate,
  42       scoped_refptr<base::SequencedTaskRunner> service_task_runner);
  43   ~DeviceManagerImpl() override;
  44
  45   void set_connection_error_handler(const mojo::Closure& error_handler);
  46
  47  private:
  48   class ServiceThreadHelper;
  49
  50   // DeviceManager implementation:
  51   void GetDevices(EnumerationOptionsPtr options,
  52                   const GetDevicesCallback& callback) override;
  53   void GetDeviceChanges(const GetDeviceChangesCallback& callback) override;
  54   void OpenDevice(const mojo::String& guid,
  55                   mojo::InterfaceRequest<Device> device_request,
  56                   const OpenDeviceCallback& callback) override;
  57
  58   // Callbacks to handle the async responses from the underlying UsbService.
  59   void OnGetDevices(const GetDevicesCallback& callback,
  60                     mojo::Array<DeviceInfoPtr> devices);
  61   void OnGetInitialDevices(const GetDeviceChangesCallback& callback,
  62                            mojo::Array<DeviceInfoPtr> devices);
  63
  64   // Methods called by |helper_| when devices are added or removed.
  65   void OnDeviceAdded(DeviceInfoPtr device);
  66   void OnDeviceRemoved(std::string device_guid);
  67   void MaybeRunDeviceChangesCallback();
  68
  69   mojo::StrongBinding<DeviceManager> binding_;
  70
  71   scoped_ptr<DeviceManagerDelegate> delegate_;
  72   scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
  73
  74   // If there are unfinished calls to GetDeviceChanges their callbacks
  75   // are stored in |device_change_callbacks_|. Otherwise device changes
  76   // are collected in |devices_added_| and |devices_removed_| until the
  77   // next call to GetDeviceChanges.
  78   std::queue<GetDeviceChangesCallback> device_change_callbacks_;
  79   mojo::Array<DeviceInfoPtr> devices_added_;
  80   std::set<std::string> devices_removed_;
  81
  82   // |helper_| is owned by the service thread and holds a weak reference
  83   // back to the device manager that created it.
  84   ServiceThreadHelper* helper_ = nullptr;
  85
  86   base::WeakPtrFactory<DeviceManagerImpl> weak_factory_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(DeviceManagerImpl);
  89 };
  90
  91 }  // namespace usb
  92 }  // namespace device
  93
  94 #endif  // DEVICE_USB_DEVICE_MANAGER_IMPL_H_