private IZipkinQueryDAO getZipkinQueryDAO() {
        if (zipkinQueryDAO == null) {
            zipkinQueryDAO = moduleManager.find(StorageModule.NAME).provider().getService(IZipkinQueryDAO.class);
        }
        return zipkinQueryDAO;
    }
Reference from zipkin2.server.internal.ZipkinQueryApiV2 for the API consistent.
oap-server/server-query-plugin/zipkin-query-plugin/src/main/java/org/apache/skywalking/oap/query/zipkin/handler/ZipkinQueryHandler.java