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92 lines
2.2 KiB
92 lines
2.2 KiB
#ifndef object_wrap_h
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#define object_wrap_h
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#include <v8.h>
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#include <assert.h>
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namespace node {
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class ObjectWrap {
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public:
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ObjectWrap ( ) {
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refs_ = 0;
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}
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virtual ~ObjectWrap ( ) {
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if (!handle_.IsEmpty()) {
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assert(handle_.IsNearDeath());
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handle_->SetInternalField(0, v8::Undefined());
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handle_.Dispose();
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handle_.Clear();
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}
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}
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protected:
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template <class T>
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static inline T* Unwrap (v8::Handle<v8::Object> handle)
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{
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assert(!handle.IsEmpty());
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assert(handle->InternalFieldCount() > 0);
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return static_cast<T*>(v8::Handle<v8::External>::Cast(
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handle->GetInternalField(0))->Value());
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}
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inline void Wrap (v8::Handle<v8::Object> handle)
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{
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assert(handle_.IsEmpty());
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assert(handle->InternalFieldCount() > 0);
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handle_ = v8::Persistent<v8::Object>::New(handle);
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handle_->SetInternalField(0, v8::External::New(this));
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MakeWeak();
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}
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inline void MakeWeak (void)
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{
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handle_.MakeWeak(this, WeakCallback);
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}
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/* Ref() marks the object as being attached to an event loop.
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* Refed objects will not be garbage collected, even if
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* all references are lost.
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*/
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virtual void Ref() {
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assert(!handle_.IsEmpty());
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assert(handle_.IsWeak());
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refs_++;
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}
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/* Unref() marks an object as detached from the event loop. This is its
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* default state. When an object with a "weak" reference changes from
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* attached to detached state it will be freed. Be careful not to access
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* the object after making this call as it might be gone!
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* (A "weak reference" means an object that only has a
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* persistant handle.)
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*
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* DO NOT CALL THIS FROM DESTRUCTOR
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*/
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virtual void Unref() {
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assert(!handle_.IsEmpty());
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assert(handle_.IsWeak());
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assert(refs_ > 0);
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refs_--;
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if (refs_ == 0 && handle_.IsNearDeath()) delete this;
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}
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v8::Persistent<v8::Object> handle_; // ro
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int refs_; // ro
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private:
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static void WeakCallback (v8::Persistent<v8::Value> value, void *data)
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{
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ObjectWrap *obj = static_cast<ObjectWrap*>(data);
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assert(value == obj->handle_);
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if (obj->refs_ == 0) {
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delete obj;
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} else {
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obj->MakeWeak();
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}
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}
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};
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} // namespace node
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#endif // object_wrap_h
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