chrome/browser/usb/usb_context.h

   1 // Copyright 2013 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 CHROME_BROWSER_USB_USB_CONTEXT_H_
   6 #define CHROME_BROWSER_USB_USB_CONTEXT_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/threading/thread_checker.h"
  12 #include "content/public/browser/browser_thread.h"
  13
  14 struct libusb_context;
  15
  16 typedef libusb_context* PlatformUsbContext;
  17
  18 // Ref-counted wrapper for libusb_context*.
  19 // It also manages the life-cycle of UsbEventHandler.
  20 // It is a blocking operation to delete UsbContext.
  21 // Destructor must be called on FILE thread.
  22 class UsbContext : public base::RefCountedThreadSafe<UsbContext> {
  23  public:
  24   PlatformUsbContext context() const { return context_; }
  25
  26  protected:
  27   friend class UsbService;
  28   friend class base::RefCountedThreadSafe<UsbContext>;
  29
  30   explicit UsbContext(PlatformUsbContext context);
  31   virtual ~UsbContext();
  32
  33  private:
  34   class UsbEventHandler;
  35   PlatformUsbContext context_;
  36   UsbEventHandler* event_handler_;
  37   base::ThreadChecker thread_checker_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(UsbContext);
  40 };
  41
  42 #endif  // CHROME_BROWSER_USB_USB_CONTEXT_H_