node/src/node_object_wrap.h at master · bionicpill/node · GitHub

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#ifndef object_wrap_h

#define object_wrap_h

#include <v8.h>

#include <assert.h>

namespace node {

class ObjectWrap {

public:

ObjectWrap ( ) {

refs_ = 0;

}

virtual ~ObjectWrap ( ) {

if (!handle_.IsEmpty()) {

assert(handle_.IsNearDeath());

handle_->SetInternalField(0, v8::Undefined());

handle_.Dispose();

handle_.Clear();

}

template <class T>

static inline T* Unwrap (v8::Handle<v8::Object> handle)

{

assert(!handle.IsEmpty());

assert(handle->InternalFieldCount() > 0);

return static_cast<T*>(v8::Handle<v8::External>::Cast(

handle->GetInternalField(0))->Value());

}

v8::Persistent<v8::Object> handle_; // ro

protected:

inline void Wrap (v8::Handle<v8::Object> handle)

{

assert(handle_.IsEmpty());

assert(handle->InternalFieldCount() > 0);

handle_ = v8::Persistent<v8::Object>::New(handle);

handle_->SetInternalField(0, v8::External::New(this));

MakeWeak();

}

inline void MakeWeak (void)

{

handle_.MakeWeak(this, WeakCallback);

}

/* Ref() marks the object as being attached to an event loop.

* Refed objects will not be garbage collected, even if

* all references are lost.

virtual void Ref() {

assert(!handle_.IsEmpty());

refs_++;

handle_.ClearWeak();

}

/* Unref() marks an object as detached from the event loop. This is its

* default state. When an object with a "weak" reference changes from

* attached to detached state it will be freed. Be careful not to access

* the object after making this call as it might be gone!

* (A "weak reference" means an object that only has a

* persistant handle.)

* DO NOT CALL THIS FROM DESTRUCTOR

virtual void Unref() {

assert(!handle_.IsEmpty());

assert(!handle_.IsWeak());

assert(refs_ > 0);

if (--refs_ == 0) { MakeWeak(); }

}

int refs_; // ro

private:

static void WeakCallback (v8::Persistent<v8::Value> value, void *data)

{

ObjectWrap *obj = static_cast<ObjectWrap*>(data);

assert(value == obj->handle_);

assert(!obj->refs_);

if (value.IsNearDeath()) delete obj;

}

};

} // namespace node

#endif // object_wrap_h

node/src/node_object_wrap.h at master · bionicpill/node · GitHub

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