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 COMPONENTS_USB_SERVICE_USB_CONTEXT_H_ 6 #define COMPONENTS_USB_SERVICE_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 "components/usb_service/usb_service_export.h" 13 14 struct libusb_context; 15 16 namespace usb_service { 17 18 typedef libusb_context* PlatformUsbContext; 19 20 // Ref-counted wrapper for libusb_context*. 21 // It also manages the life-cycle of UsbEventHandler. 22 // It is a blocking operation to delete UsbContext. 23 // Destructor must be called on FILE thread. 24 class USB_SERVICE_EXPORT UsbContext 25 : public base::RefCountedThreadSafe<UsbContext> { 26 public: context()27 PlatformUsbContext context() const { return context_; } 28 29 protected: 30 friend class UsbServiceImpl; 31 friend class base::RefCountedThreadSafe<UsbContext>; 32 33 explicit UsbContext(PlatformUsbContext context); 34 virtual ~UsbContext(); 35 36 private: 37 class UsbEventHandler; 38 PlatformUsbContext context_; 39 UsbEventHandler* event_handler_; 40 base::ThreadChecker thread_checker_; 41 42 DISALLOW_COPY_AND_ASSIGN(UsbContext); 43 }; 44 45 } // namespace usb_service 46 47 #endif // COMPONENTS_USB_SERVICE_USB_CONTEXT_H_ 48