public Collection<String> allFullSourceTopicNames() {
        final List<String> sourceTopics = new ArrayList<>();
        applyToEachBuilder(b -> sourceTopics.addAll(b.fullSourceTopicNames()));
        return sourceTopics;
    }
@return true iff any of the topologies have no local (aka non-global) topology
streams/src/main/java/org/apache/kafka/streams/processor/internals/TopologyMetadata.java