[jboss-dev-forums] [Design of JBossCache] - Re: Common marshalling infrastructure

[manik.surtani@jboss.com]

Re: ref counting, I understand about class data, but as long as instance data is also only written once then that is fine.  

Re: version headers, perhaps I could swap ObjectMarshallers midway?

e.g., 


  | Map<Short, ObjectMarshaller> objectMarshallers = ... ;
  | ByteInput in = new ByteBufferByteInputAdapter(byteBuffer);
  | unmarshaller.start(in);
  | short versionId = (Short) unmarshaller.readObjectUnshared();
  | unmarshaller.setObjectMarshaller( objectMarshallers.get(versionId) );
  | // ...
  | // continue unmarshalling rest of my state
  | // ...
  | 
  | 


And when marshalling how would object marshallers be selected?  I'm guessing a preference for anything that uses magic numbers (how would you denote that an internal class - which *may* implement Externalizable as well - should be marshalled based on a magic number?  Another marker interface, perhaps?  Or a sub-interface to Externalizable - Marshallable?  And if this is not present then test for Externalizable, and then Serializable, etc., and finally falling back to an Externalizer?

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