private static ProtobufMessages.NodeMemory writeRIANodeMemory(final int nodeId,
final MarshallerWriteContext context,
final BaseNode node,
final NodeMemories memories,
final Memory memory) {
RightInputAdapterNode riaNode = (RightInputAdapterNode) node;
ObjectSink[] sinks = riaNode.getSinkPropagator().getSinks();
BetaNode betaNode = (BetaNode) sinks[0];
Memory betaMemory = memories.peekNodeMemory( betaNode.getId() );
if ( betaMemory == null ) {
return null;