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      1 // Copyright (c) 2012 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 PPAPI_PROXY_DEVICE_ENUMERATION_RESOURCE_HELPER_H_
      6 #define PPAPI_PROXY_DEVICE_ENUMERATION_RESOURCE_HELPER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/memory/weak_ptr.h"
     13 #include "ppapi/c/dev/ppb_device_ref_dev.h"
     14 #include "ppapi/proxy/ppapi_proxy_export.h"
     15 #include "ppapi/shared_impl/thread_aware_callback.h"
     16 
     17 namespace IPC {
     18 class Message;
     19 }
     20 
     21 struct PP_ArrayOutput;
     22 
     23 namespace ppapi {
     24 
     25 struct DeviceRefData;
     26 class TrackedCallback;
     27 
     28 namespace proxy {
     29 
     30 class PluginResource;
     31 class ResourceMessageReplyParams;
     32 
     33 class PPAPI_PROXY_EXPORT DeviceEnumerationResourceHelper
     34     : public base::SupportsWeakPtr<DeviceEnumerationResourceHelper> {
     35  public:
     36   // |owner| must outlive this object.
     37   explicit DeviceEnumerationResourceHelper(PluginResource* owner);
     38   ~DeviceEnumerationResourceHelper();
     39 
     40   int32_t EnumerateDevices(const PP_ArrayOutput& output,
     41                            scoped_refptr<TrackedCallback> callback);
     42   int32_t EnumerateDevicesSync(const PP_ArrayOutput& output);
     43   int32_t MonitorDeviceChange(PP_MonitorDeviceChangeCallback callback,
     44                               void* user_data);
     45 
     46   // Returns true if the message has been handled.
     47   bool HandleReply(const ResourceMessageReplyParams& params,
     48                    const IPC::Message& msg);
     49 
     50   void LastPluginRefWasDeleted();
     51 
     52  private:
     53   void OnPluginMsgEnumerateDevicesReply(
     54       const PP_ArrayOutput& output,
     55       scoped_refptr<TrackedCallback> callback,
     56       const ResourceMessageReplyParams& params,
     57       const std::vector<DeviceRefData>& devices);
     58   void OnPluginMsgNotifyDeviceChange(const ResourceMessageReplyParams& params,
     59                                      uint32_t callback_id,
     60                                      const std::vector<DeviceRefData>& devices);
     61 
     62   int32_t WriteToArrayOutput(const std::vector<DeviceRefData>& devices,
     63                              const PP_ArrayOutput& output);
     64 
     65   // Not owned by this object.
     66   PluginResource* owner_;
     67 
     68   bool pending_enumerate_devices_;
     69 
     70   uint32_t monitor_callback_id_;
     71   scoped_ptr<ThreadAwareCallback<PP_MonitorDeviceChangeCallback> >
     72       monitor_callback_;
     73   void* monitor_user_data_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(DeviceEnumerationResourceHelper);
     76 };
     77 
     78 }  // namespace proxy
     79 }  // namespace ppapi
     80 
     81 #endif  // PPAPI_PROXY_DEVICE_ENUMERATION_RESOURCE_HELPER_H_
     82