ppapi/native_client/src/trusted/plugin/callback_source.h

   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 NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_CALLBACK_SOURCE_H
   6 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_CALLBACK_SOURCE_H
   7
   8 #include "ppapi/cpp/completion_callback.h"
   9
  10 namespace plugin {
  11
  12 // Classes that implement this interface can be used with FileDownloader's
  13 // DOWNLOAD_STREAM mode. For each chunk of the file as it downloads,
  14 // The FileDownloader will get a callback of type
  15 // pp::CompletionCallbackWithOutput<std::vector<char>*> using the
  16 // GetCallback function, and call it immediately, passing a pointer to a
  17 // vector with the data as the output field. The class is templatized just
  18 // in case there are any other use cases in the future.
  19 // This class really only exists as a way to get callbacks
  20 // bound to an object (i.e. we don't need the asynchronous behavior of PPAPI)
  21 // All we really need is tr1::function or base::bind or some such, but we don't
  22 // have those in the plugin.
  23
  24 template<class T>
  25 class CallbackSource {
  26  public:
  27   virtual ~CallbackSource();
  28   // Returns a callback from callback_factory's NewCallbackWithOutput,
  29   // bound to the implementing object.
  30   virtual pp::CompletionCallbackWithOutput<T> GetCallback() = 0;
  31 };
  32 }
  33 #endif // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_CALLBACK_SOURCE_H