I'm writing an addon for nodejs with v8. The library is libxmljs and it provides an implementation of a DOM using the libxml2 library. I would appreciate some guidance on a problem I need to solve.
The short description of my problem is I've got C++ objects referencing libxml structs. The structs themselves are organized into the DOM tree by libxml. So the C++ objects don't reference each other directly. I'm using persistent handles point to the C++ objects to keep them from being collected. But what I need is a to keep the Persistent handles from being weak. Right now they're always weak and they get collected during idle times when the GC runs. I have two likely strategies for this. 1. Reference counting. I can add reference updates in my api that inc/ dec the count when a node is added to or removed from the DOM tree. This would work and is my second option. It's not at the top of my list simply because I can imagine #2 being a little easier to maintain. 2. References to all persistent handles to a DOM node are non-weak and kept in a persistence list. They are added when the node is added to the DOM tree and they are kept around for the life of the document. When the document is freed, the list is released and the handles are all made weak and eligible for collection. This seems sensible and you only have to manage the list in 2 places. On node creation and on document destruction. I was pointed to the api method v8::V8::AddObjectGroup to try and accomplish this. But I can't find very much info on how to use it effectively. Also, even if I could populate it with my objects, the api description says it is released after every GC. Is there a way to prevent that? I would like it to stick around until explicitly released? I would appreciate input on either of these methods. Thanks. :Marco -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users
