I assume you're storing references to the objects as Persistent? All you
need to do then is call SetWeak()
https://v8docs.nodesource.com/node-0.10/d2/d78/classv8_1_1_persistent.html
void MakeWeak (void *parameters, WeakReferenceCallback callback)
the callback is called when the object is GC'd.
On Wed, Nov 15, 2017 at 8:37 AM, Jean-Marc Le Roux <jeanmarc.ler...@aerys.in
> wrote:
> So I've found a solution to make things lazy: I set an accessor instead of
> decoding/setting the actual value.
>
> void
> getter(Local<Name> property, const PropertyCallbackInfo<Value>& info)
> {
> Isolate* isolate = info.GetIsolate();
>
> const bson_t* document = reinterpret_cast<bson_t*>(
> info.This()
> ->Get(String::NewFromUtf8(isolate, "__bson_document_ptr"))
> ->ToInt32()->Value()
> );
>
> char key[255];
> property->ToString(isolate)->WriteUtf8(key, 255);
>
> bson_iter_t iter;
> bson_iter_init(&iter, document);
> // FIXME: index the property so we don't have to find it
> bson_iter_find(&iter, key);
>
> // FIXME: replace the accessor with the deserialized value
>
> info.GetReturnValue().Set(iterator_to_value(isolate, &iter));
> }
>
> Local<Value>
> fill_object(Isolate* isolate, Local<Object>& obj, const bson_t* document)
> {
> obj->Set(
> String::NewFromUtf8(isolate, "__bson_document_ptr"),
> Int32::New(isolate, reinterpret_cast<intptr_t>(document))
> );
>
> bson_iter_t iter;
> if (bson_iter_init(&iter, document))
> {
> while (bson_iter_next(&iter))
> {
> const char* key = bson_iter_key(&iter);
>
> if (!obj->Has(String::NewFromUtf8(isolate, key)))
> {
> obj->SetAccessor(
> isolate->GetCurrentContext(),
> String::NewFromUtf8(isolate, key),
> &getter
> );
> }
> }
> }
> }
>
> The secret sauce is to :
>
> - keep the original data (the bson_t) allocated
> - store the corresponding pointer in a v8::Object
>
> But now I have a memory leak because those pointers will never be freed.
> How can I know when the Object will be disposed by the GC?
>
> Thanks,
>
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