@Override
    public String toString() {
        return "StatefulProcessorNode{" +
            "storeNames=" + Arrays.toString(storeNames) +
            ", storeBuilder=" + storeFactory +
            "} " + super.toString();
    }
Create a node representing a stateful processor,
where the store needs to be built and registered as part of building this node.
streams/src/main/java/org/apache/kafka/streams/kstream/internals/graph/StatefulProcessorNode.java