Re: [cp-patches] [RFA/JDWP] IdManager

[Archie Cobbs]

Keith Seitz wrote:
> > > +  /* Mapping of class (Class) to IDs (ReferenceTypeId) for reference
> > > +     types. Unlike other types, reference id types are NEVER released. */
> > > +  private Hashtable _classTable;
> >
> > What if a class(loader)s are garbage collected? Would this hash table
> > then become a memory leak?gets
>
> Yes, but unfortunately, JDWP specifically says that reference type IDs
> are never reused, even if the classes are gc'd or unloaded. The same ID
> is valid for any reference type for the entirety of the debugging
> session. Or at least that's how I interpret this explanation of
> "referenceTypeId":
>
> "Uniquely identifies a reference type in the target VM. It should not be
> assumed that for a particular class, the classObjectID and the
> referenceTypeID are the same. A particular reference type will be
> identified by exactly one ID in JDWP commands and replies throughout its
> lifetime A referenceTypeID is not reused to identify a different
> reference type, regardless of whether the referenced class has been
> unloaded."

This seems to only imply that whoever is creating ReferenceTypeID's
must create a new and unique one every time, not that you need to
cache them after the associated class has been unloaded... ?

In any case, how is a class ever going to be unloaded if your
Hashtable is referencing it? :-)

-Archie

__________________________________________________________________________
Archie Cobbs      *        CTO, Awarix        *      http://www.awarix.com