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124 lines
3.6 KiB
124 lines
3.6 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef object_wrap_h
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#define object_wrap_h
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#include "node.h"
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#include "v8.h"
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#include <assert.h>
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// Explicitly instantiate some template classes, so we're sure they will be
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// present in the binary / shared object. There isn't much doubt that they will
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// be, but MSVC tends to complain about these things.
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#ifdef _MSC_VER
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template class NODE_EXTERN v8::Persistent<v8::Object>;
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template class NODE_EXTERN v8::Persistent<v8::FunctionTemplate>;
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#endif
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namespace node {
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class NODE_EXTERN 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_.ClearWeak();
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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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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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return static_cast<T*>(handle->GetPointerFromInternalField(0));
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}
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v8::Persistent<v8::Object> handle_; // ro
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protected:
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inline void Wrap (v8::Handle<v8::Object> handle) {
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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_->SetPointerInInternalField(0, this);
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MakeWeak();
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}
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inline void MakeWeak (void) {
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handle_.MakeWeak(this, WeakCallback);
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handle_.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(!handle_.IsEmpty());
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refs_++;
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handle_.ClearWeak();
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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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if (--refs_ == 0) { MakeWeak(); }
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}
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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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ObjectWrap *obj = static_cast<ObjectWrap*>(data);
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assert(value == obj->handle_);
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assert(!obj->refs_);
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assert(value.IsNearDeath());
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delete obj;
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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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