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92 lines (73 loc) · 2.12 KB
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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_.ClearWeak();
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*>(handle->GetPointerFromInternalField(0));
}
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_->SetPointerInInternalField(0, 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_);
assert(value.IsNearDeath());
delete obj;
}
};
} // namespace node
#endif // object_wrap_h