I've recently had to fix a problem in the SDO for PHP code where the
user was holding a reference to a DataObjectList, the containing
DataObject was dropped, and the list went eerily empty.
Example:
DataObjectPtr dop = xmlDocumentPtr->getRootDataObject();
DataObjectList& dol = dop->getList(propertyName);
/* print the list - it's populated */
dop = NULL;
/* print the list - it's now empty */
I fixed this by making the PHP wrapper for the list also hold a
reference to the containing DataObject, so that it will not be freed
whilst the user is working on the list.
I think this is Working As Designed according to the specification, and
it was just my carelessness in assuming that a DataObjectList is
reference-counted in the same way as a DataObject. But I'm inclined to
see this as a spec issue - I don't see why DataObjectLists would behave
differently from DataObjects, and it makes the API quite confusing.
What's the rationale for this?
A related issue is that I don't see a (public) way to reach the
containing DataObject from a DataObjectList. Did I miss something?
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