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 EXTENSIONS_RENDERER_NATIVE_HANDLER_H_
6#define EXTENSIONS_RENDERER_NATIVE_HANDLER_H_
7
8#include "base/basictypes.h"
9#include "v8/include/v8.h"
10
11namespace extensions {
12
13// NativeHandlers are intended to be used with a ModuleSystem. The ModuleSystem
14// will assume ownership of the NativeHandler, and as a ModuleSystem is tied to
15// a single v8::Context, this implies that NativeHandlers will also be tied to
16// a single v8::Context.
17// TODO(koz): Rename this to NativeJavaScriptModule.
18class NativeHandler {
19 public:
20  NativeHandler();
21  virtual ~NativeHandler();
22
23  // Create a new instance of the object this handler specifies.
24  virtual v8::Handle<v8::Object> NewInstance() = 0;
25
26  // Invalidate this object so it cannot be used any more. This is needed
27  // because it's possible for this to outlive its owner context. Invalidate
28  // must be called before this happens.
29  //
30  // Subclasses should override to invalidate their own V8 state. If they do
31  // they must call their superclass' Invalidate().
32  virtual void Invalidate();
33
34 protected:
35  // Allow subclasses to query valid state.
36  bool is_valid() { return is_valid_; }
37
38 private:
39  bool is_valid_;
40
41  DISALLOW_COPY_AND_ASSIGN(NativeHandler);
42};
43
44}  // namespace extensions
45
46#endif  // EXTENSIONS_RENDERER_NATIVE_HANDLER_H_
47