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James M Snell
936c9ffb0f
* doc: improve http.abort description * doc: mention that mode is ignored if file exists * docs: Fix default options for fs.createWriteStream() * Documentation update about Buffer initialization * doc: add a note about readable in flowing mode * doc: Document http.request protocol option * doc, comments: Grammar and spelling fixes * updated documentation for fs.createReadStream * Update child_process.markdown, spelling * doc: Clarified read method with specified size argument. * docs:events clarify emitter.listener() behavior * doc: two minor stream doc improvements * doc: clarify Readable._read and Readable.push * doc: stream.unshift does not reset reading state * doc: readable event clarification * doc: additional refinement to readable event Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ben Noorduis <ben@strongloop.com> PR-URL: https://github.com/nodejs/io.js/pull/2302
117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
#ifndef SRC_NODE_OBJECT_WRAP_H_
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#define SRC_NODE_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 (persistent().IsEmpty())
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return;
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assert(persistent().IsNearDeath());
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persistent().ClearWeak();
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persistent().Reset();
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}
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template <class T>
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static inline T* Unwrap(v8::Handle<v8::Object> handle) {
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assert(!handle.IsEmpty());
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assert(handle->InternalFieldCount() > 0);
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// Cast to ObjectWrap before casting to T. A direct cast from void
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// to T won't work right when T has more than one base class.
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void* ptr = handle->GetAlignedPointerFromInternalField(0);
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ObjectWrap* wrap = static_cast<ObjectWrap*>(ptr);
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return static_cast<T*>(wrap);
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}
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inline v8::Local<v8::Object> handle() {
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return handle(v8::Isolate::GetCurrent());
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}
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inline v8::Local<v8::Object> handle(v8::Isolate* isolate) {
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return v8::Local<v8::Object>::New(isolate, persistent());
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}
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inline v8::Persistent<v8::Object>& persistent() {
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return handle_;
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}
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protected:
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inline void Wrap(v8::Handle<v8::Object> handle) {
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assert(persistent().IsEmpty());
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assert(handle->InternalFieldCount() > 0);
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handle->SetAlignedPointerInInternalField(0, this);
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persistent().Reset(v8::Isolate::GetCurrent(), handle);
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MakeWeak();
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}
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inline void MakeWeak(void) {
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persistent().SetWeak(this, WeakCallback);
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persistent().MarkIndependent();
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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(!persistent().IsEmpty());
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persistent().ClearWeak();
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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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* persistent 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(!persistent().IsEmpty());
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assert(!persistent().IsWeak());
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assert(refs_ > 0);
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if (--refs_ == 0)
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MakeWeak();
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}
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int refs_; // ro
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private:
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static void WeakCallback(
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const v8::WeakCallbackData<v8::Object, ObjectWrap>& data) {
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v8::Isolate* isolate = data.GetIsolate();
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v8::HandleScope scope(isolate);
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ObjectWrap* wrap = data.GetParameter();
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assert(wrap->refs_ == 0);
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assert(wrap->handle_.IsNearDeath());
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assert(
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data.GetValue() == v8::Local<v8::Object>::New(isolate, wrap->handle_));
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wrap->handle_.Reset();
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delete wrap;
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}
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v8::Persistent<v8::Object> handle_;
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};
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} // namespace node
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#endif // SRC_NODE_OBJECT_WRAP_H_
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