@Override
    public DefaultServiceConfigSetters defaultServiceName(String defaultServiceName) {
        requireNonNull(defaultServiceName, "defaultServiceName");
        this.defaultServiceName = defaultServiceName;
        defaultServiceNaming = ServiceNaming.of(defaultServiceName);
        return this;
    }
A default implementation of {@link ServiceConfigSetters} that stores service related settings
and provides a method {@link DefaultServiceConfigSetters#toServiceConfigBuilder(Route, String, HttpService)}
to build {@link ServiceConfigBuilder}.
core/src/main/java/com/linecorp/armeria/server/DefaultServiceConfigSetters.java