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81 lines
2.0 KiB
81 lines
2.0 KiB
16 years ago
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#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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#define NODE_UNWRAP(type, value) static_cast<type*>(node::ObjectWrap::Unwrap(value))
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class ObjectWrap {
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public:
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ObjectWrap ( ) {
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weak_ = false;
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attached_ = false;
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}
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virtual ~ObjectWrap ( ) {
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if (!handle_.IsEmpty()) {
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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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static inline void* Unwrap (v8::Handle<v8::Object> handle)
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{
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assert(!handle.IsEmpty());
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assert(handle->InternalFieldCount() == 1);
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return 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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handle_.MakeWeak(this, MakeWeak);
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}
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/* Attach() marks the object as being attached to an event loop.
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* Attached objects will not be garbage collected, even if
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* all references are lost.
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*/
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void Attach() {
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assert(!handle_.IsEmpty());
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attached_ = true;
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}
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/* Detach() 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" is v8 terminology for an object that only has a
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* persistant handle.)
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*/
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void Detach() {
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assert(!handle_.IsEmpty());
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attached_ = false;
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if (weak_) delete this;
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}
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v8::Persistent<v8::Object> handle_;
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private:
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static void MakeWeak (v8::Persistent<v8::Value> value, void *data) {
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ObjectWrap *obj = static_cast<ObjectWrap*>(data);
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assert(value == obj->handle_);
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obj->weak_ = true;
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if (!obj->attached_) delete obj;
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}
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bool attached_;
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bool weak_;
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};
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} // namespace node
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#endif // object_wrap_h
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