106 lines
3.3 KiB
C++
106 lines
3.3 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_EDK_JS_HANDLE_H_
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#define MOJO_EDK_JS_HANDLE_H_
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#include <stdint.h>
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#include "base/observer_list.h"
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#include "gin/converter.h"
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#include "gin/handle.h"
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#include "gin/wrappable.h"
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#include "mojo/public/cpp/system/core.h"
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namespace mojo {
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namespace edk {
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namespace js {
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class HandleCloseObserver;
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// Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
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// is Closed when its JS object is garbage collected.
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class HandleWrapper : public gin::Wrappable<HandleWrapper> {
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public:
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static gin::WrapperInfo kWrapperInfo;
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static gin::Handle<HandleWrapper> Create(v8::Isolate* isolate,
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MojoHandle handle) {
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return gin::CreateHandle(isolate, new HandleWrapper(handle));
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}
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mojo::Handle get() const { return handle_.get(); }
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mojo::Handle release() { return handle_.release(); }
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void Close();
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void AddCloseObserver(HandleCloseObserver* observer);
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void RemoveCloseObserver(HandleCloseObserver* observer);
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protected:
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HandleWrapper(MojoHandle handle);
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~HandleWrapper() override;
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void NotifyCloseObservers();
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mojo::ScopedHandle handle_;
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base::ObserverList<HandleCloseObserver> close_observers_;
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};
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} // namespace js
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} // namespace edk
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} // namespace mojo
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namespace gin {
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// Note: It's important to use this converter rather than the one for
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// MojoHandle, since that will do a simple int32_t conversion. It's unfortunate
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// there's no way to prevent against accidental use.
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// TODO(mpcomplete): define converters for all Handle subtypes.
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template<>
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struct Converter<mojo::Handle> {
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static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
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const mojo::Handle& val);
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static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
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mojo::Handle* out);
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};
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template<>
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struct Converter<mojo::MessagePipeHandle> {
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static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
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mojo::MessagePipeHandle val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Handle<v8::Value> val,
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mojo::MessagePipeHandle* out);
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};
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// We need to specialize the normal gin::Handle converter in order to handle
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// converting |null| to a wrapper for an empty mojo::Handle.
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template <>
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struct Converter<gin::Handle<mojo::edk::js::HandleWrapper>> {
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static v8::Handle<v8::Value> ToV8(
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v8::Isolate* isolate,
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const gin::Handle<mojo::edk::js::HandleWrapper>& val) {
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return val.ToV8();
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Handle<v8::Value> val,
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gin::Handle<mojo::edk::js::HandleWrapper>* out) {
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if (val->IsNull()) {
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*out = mojo::edk::js::HandleWrapper::Create(isolate, MOJO_HANDLE_INVALID);
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return true;
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}
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mojo::edk::js::HandleWrapper* object = NULL;
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if (!Converter<mojo::edk::js::HandleWrapper*>::FromV8(isolate, val,
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&object)) {
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return false;
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}
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*out = gin::Handle<mojo::edk::js::HandleWrapper>(val, object);
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return true;
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}
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};
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} // namespace gin
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#endif // MOJO_EDK_JS_HANDLE_H_
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