Implement Asynchronous Module Definition API for Mojo

gin/per_context_data.h

+// Copyright 2013 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 GIN_PER_CONTEXT_DATA_H_
+#define GIN_PER_CONTEXT_DATA_H_
+
+#include <vector>
+#include "base/basictypes.h"
+#include "v8/include/v8.h"
+
+namespace gin {
+
+class ContextSupplement {
+ public:
+  ContextSupplement();
+  virtual ~ContextSupplement();
+
+  virtual void Detach(v8::Handle<v8::Context> context) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContextSupplement);
+};
+
+class PerContextData {
+ public:
+  explicit PerContextData(v8::Handle<v8::Context> context);
+  ~PerContextData();
+
+  // Can return NULL after the ContextHolder has detached from context.
+  static PerContextData* From(v8::Handle<v8::Context>);
+  void Detach(v8::Handle<v8::Context> context);
+
+  // Takes ownership of the supplement.
+  void AddSupplement(ContextSupplement* supplement);
+
+ private:
+  typedef std::vector<ContextSupplement*> SuplementVector;
+
+  // Owning reference.
+  SuplementVector supplements_;
+
+  DISALLOW_COPY_AND_ASSIGN(PerContextData);
+};
+
+}  // namespace gin
+
+#endif  // GIN_PER_CONTEXT_DATA_H_