112 строки
2.7 KiB
C++
112 строки
2.7 KiB
C++
// Copyright 2014 Cheng Zhao. All rights reserved.
|
|
// Use of this source code is governed by MIT license that can be found in the
|
|
// LICENSE file.
|
|
|
|
#ifndef NATIVE_MATE_SCOPED_PERSISTENT_H_
|
|
#define NATIVE_MATE_SCOPED_PERSISTENT_H_
|
|
|
|
#include "base/memory/ref_counted.h"
|
|
#include "v8/include/v8.h"
|
|
|
|
namespace mate {
|
|
|
|
// A v8::Persistent handle to a V8 value which destroys and clears the
|
|
// underlying handle on destruction.
|
|
template <typename T>
|
|
class ScopedPersistent {
|
|
public:
|
|
ScopedPersistent() {
|
|
}
|
|
|
|
explicit ScopedPersistent(v8::Handle<T> handle) {
|
|
reset(handle);
|
|
}
|
|
|
|
~ScopedPersistent() {
|
|
reset();
|
|
}
|
|
|
|
void reset(v8::Handle<T> handle) {
|
|
if (!handle.IsEmpty())
|
|
handle_.Reset(GetIsolate(handle), handle);
|
|
else
|
|
reset();
|
|
}
|
|
|
|
void reset() {
|
|
handle_.Reset();
|
|
}
|
|
|
|
bool IsEmpty() const {
|
|
return handle_.IsEmpty();
|
|
}
|
|
|
|
v8::Handle<T> NewHandle() const {
|
|
if (handle_.IsEmpty())
|
|
return v8::Local<T>();
|
|
return v8::Local<T>::New(GetIsolate(handle_), handle_);
|
|
}
|
|
|
|
v8::Handle<T> NewHandle(v8::Isolate* isolate) const {
|
|
if (handle_.IsEmpty())
|
|
return v8::Local<T>();
|
|
return v8::Local<T>::New(isolate, handle_);
|
|
}
|
|
|
|
template <typename P>
|
|
void MakeWeak(P* parameters,
|
|
typename v8::WeakReferenceCallbacks<T, P>::Revivable callback) {
|
|
handle_.MakeWeak(parameters, callback);
|
|
}
|
|
|
|
private:
|
|
template <typename U>
|
|
static v8::Isolate* GetIsolate(v8::Handle<U> object_handle) {
|
|
// Only works for v8::Object and its subclasses. Add specialisations for
|
|
// anything else.
|
|
if (!object_handle.IsEmpty())
|
|
return GetIsolate(object_handle->CreationContext());
|
|
return v8::Isolate::GetCurrent();
|
|
}
|
|
static v8::Isolate* GetIsolate(v8::Handle<v8::Context> context_handle) {
|
|
if (!context_handle.IsEmpty())
|
|
return context_handle->GetIsolate();
|
|
return v8::Isolate::GetCurrent();
|
|
}
|
|
static v8::Isolate* GetIsolate(
|
|
v8::Handle<v8::ObjectTemplate> template_handle) {
|
|
return v8::Isolate::GetCurrent();
|
|
}
|
|
template <typename U>
|
|
static v8::Isolate* GetIsolate(const U& any_handle) {
|
|
return v8::Isolate::GetCurrent();
|
|
}
|
|
|
|
v8::Persistent<T> handle_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(ScopedPersistent);
|
|
};
|
|
|
|
template <typename T>
|
|
class RefCountedPersistent : public ScopedPersistent<T>,
|
|
public base::RefCounted<RefCountedPersistent<T>> {
|
|
public:
|
|
RefCountedPersistent() {}
|
|
|
|
explicit RefCountedPersistent(v8::Handle<T> handle)
|
|
: ScopedPersistent<T>(handle) {
|
|
}
|
|
|
|
protected:
|
|
friend class base::RefCounted<RefCountedPersistent<T>>;
|
|
|
|
~RefCountedPersistent() {}
|
|
|
|
private:
|
|
DISALLOW_COPY_AND_ASSIGN(RefCountedPersistent);
|
|
};
|
|
|
|
} // namespace mate
|
|
|
|
#endif // NATIVE_MATE_SCOPED_PERSISTENT_H_
|