@Override
        public AnalysisListener create(ModuleManager moduleManager, AnalyzerModuleConfig config) {
            return new RPCAnalysisListener(
                sourceReceiver, config, networkAddressAliasCache, namingControl);
        }
Identify the layer of remote service. Such as  ${@link Layer#DATABASE} and ${@link Layer#CACHE}.
oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/trace/parser/listener/RPCAnalysisListener.java