New thunk system for Pepper proxy and implementation

ppapi/shared_impl/tracker_base.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_SHARED_IMPL_TRACKER_BASE_H_
+#define PPAPI_SHARED_IMPL_TRACKER_BASE_H_
+
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/proxy/interface_id.h"
+
+namespace ppapi {
+namespace shared_impl {
+
+class FunctionGroupBase;
+class ResourceObjectBase;
+
+// Tracks resource and function APIs, providing a mapping between ID and
+// object.
+// TODO(brettw) Eventually this should be one object with global tracking and
+// called "Tracker", and this would be used in both the plugin side of the
+// proxy as well as the implementation in the renderer. Currently, all this
+// does is forward to the process-type-specific tracker to get the information.
+class TrackerBase {
+ public:
+  // Must be called before any other function that uses the TrackerBase.
+  // This sets the getter that returns the global implmenetation of
+  // TrackerBase. It will be different for in the renderer and in the plugin
+  // process.
+  static void Init(TrackerBase*(*getter)());
+
+  // Retrieves the global tracker. This will be NULL if you haven't called
+  // Init() first (it should be unnecessary to NULL-check this).
+  static TrackerBase* Get();
+
+  // Returns the resource object corresponding to the given ID, or NULL if
+  // there isn't one.
+  virtual ResourceObjectBase* GetResourceAPI(PP_Resource res) = 0;
+
+  // Returns the function object corresponding to the given ID, or NULL if
+  // there isn't one.
+  virtual FunctionGroupBase* GetFunctionAPI(PP_Instance inst,
+                                            pp::proxy::InterfaceID id) = 0;
+};
+
+}  // namespace shared_impl
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_TRACKER_BASE_H_