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Side by Side Diff: mojo/edk/js/handle.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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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 MOJO_EDK_JS_HANDLE_H_
6 #define MOJO_EDK_JS_HANDLE_H_
7
8 #include "base/observer_list.h"
9 #include "gin/converter.h"
10 #include "gin/handle.h"
11 #include "gin/wrappable.h"
12 #include "mojo/public/cpp/system/core.h"
13
14 namespace mojo {
15 namespace js {
16 class HandleCloseObserver;
17
18 // Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
19 // is Closed when its JS object is garbage collected.
20 class HandleWrapper : public gin::Wrappable<HandleWrapper> {
21 public:
22 static gin::WrapperInfo kWrapperInfo;
23
24 static gin::Handle<HandleWrapper> Create(v8::Isolate* isolate,
25 MojoHandle handle) {
26 return gin::CreateHandle(isolate, new HandleWrapper(handle));
27 }
28
29 mojo::Handle get() const { return handle_.get(); }
30 mojo::Handle release() { return handle_.release(); }
31 void Close();
32
33 void AddCloseObserver(HandleCloseObserver* observer);
34 void RemoveCloseObserver(HandleCloseObserver* observer);
35
36 protected:
37 HandleWrapper(MojoHandle handle);
38 ~HandleWrapper() override;
39 void NotifyCloseObservers();
40
41 mojo::ScopedHandle handle_;
42 ObserverList<HandleCloseObserver> close_observers_;
43 };
44
45 } // namespace js
46 } // namespace mojo
47
48 namespace gin {
49
50 // Note: It's important to use this converter rather than the one for
51 // MojoHandle, since that will do a simple int32 conversion. It's unfortunate
52 // there's no way to prevent against accidental use.
53 // TODO(mpcomplete): define converters for all Handle subtypes.
54 template<>
55 struct Converter<mojo::Handle> {
56 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
57 const mojo::Handle& val);
58 static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
59 mojo::Handle* out);
60 };
61
62 template<>
63 struct Converter<mojo::MessagePipeHandle> {
64 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
65 mojo::MessagePipeHandle val);
66 static bool FromV8(v8::Isolate* isolate,
67 v8::Handle<v8::Value> val,
68 mojo::MessagePipeHandle* out);
69 };
70
71 // We need to specialize the normal gin::Handle converter in order to handle
72 // converting |null| to a wrapper for an empty mojo::Handle.
73 template<>
74 struct Converter<gin::Handle<mojo::js::HandleWrapper> > {
75 static v8::Handle<v8::Value> ToV8(
76 v8::Isolate* isolate, const gin::Handle<mojo::js::HandleWrapper>& val) {
77 return val.ToV8();
78 }
79
80 static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
81 gin::Handle<mojo::js::HandleWrapper>* out) {
82 if (val->IsNull()) {
83 *out = mojo::js::HandleWrapper::Create(isolate, MOJO_HANDLE_INVALID);
84 return true;
85 }
86
87 mojo::js::HandleWrapper* object = NULL;
88 if (!Converter<mojo::js::HandleWrapper*>::FromV8(isolate, val, &object)) {
89 return false;
90 }
91 *out = gin::Handle<mojo::js::HandleWrapper>(val, object);
92 return true;
93 }
94 };
95
96 } // namespace gin
97
98 #endif // MOJO_EDK_JS_HANDLE_H_
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