102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
// Copyright 2014 Cheng Zhao. All rights reserved.
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// Use of this source code is governed by MIT license that can be found in the
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// LICENSE file.
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#ifndef NATIVE_MATE_NATIVE_MATE_SCOPED_PERSISTENT_H_
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#define NATIVE_MATE_NATIVE_MATE_SCOPED_PERSISTENT_H_
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#include "base/memory/ref_counted.h"
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#include "native_mate/converter.h"
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#include "v8/include/v8.h"
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namespace mate {
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// A v8::Persistent handle to a V8 value which destroys and clears the
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// underlying handle on destruction.
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template <typename T>
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class ScopedPersistent {
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public:
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ScopedPersistent() : isolate_(v8::Isolate::GetCurrent()) {}
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ScopedPersistent(v8::Isolate* isolate, v8::Local<v8::Value> handle)
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: isolate_(isolate) {
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reset(isolate, v8::Local<T>::Cast(handle));
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}
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~ScopedPersistent() { reset(); }
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void reset(v8::Isolate* isolate, v8::Local<T> handle) {
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if (!handle.IsEmpty()) {
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isolate_ = isolate;
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handle_.Reset(isolate, handle);
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} else {
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reset();
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}
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}
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void reset() { handle_.Reset(); }
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bool IsEmpty() const { return handle_.IsEmpty(); }
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v8::Local<T> NewHandle() const { return NewHandle(isolate_); }
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v8::Local<T> NewHandle(v8::Isolate* isolate) const {
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if (handle_.IsEmpty())
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return v8::Local<T>();
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return v8::Local<T>::New(isolate, handle_);
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}
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template <typename P, typename C>
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void SetWeak(P* parameter, C callback) {
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handle_.SetWeak(parameter, callback);
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}
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v8::Isolate* isolate() const { return isolate_; }
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private:
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v8::Isolate* isolate_;
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v8::Persistent<T> handle_;
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DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
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};
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template <typename T>
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class RefCountedPersistent : public ScopedPersistent<T>,
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public base::RefCounted<RefCountedPersistent<T>> {
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public:
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RefCountedPersistent() {}
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RefCountedPersistent(v8::Isolate* isolate, v8::Local<v8::Value> handle)
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: ScopedPersistent<T>(isolate, handle) {}
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protected:
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friend class base::RefCounted<RefCountedPersistent<T>>;
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~RefCountedPersistent() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(RefCountedPersistent);
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};
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template <typename T>
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struct Converter<ScopedPersistent<T>> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const ScopedPersistent<T>& val) {
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return val.NewHandle(isolate);
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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ScopedPersistent<T>* out) {
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v8::Local<T> converted;
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if (!Converter<v8::Local<T>>::FromV8(isolate, val, &converted))
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return false;
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out->reset(isolate, converted);
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return true;
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}
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};
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} // namespace mate
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#endif // NATIVE_MATE_NATIVE_MATE_SCOPED_PERSISTENT_H_
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