private ISpanAttachedEventQueryDAO getSpanAttachedEventQueryDAO() {
        if (spanAttachedEventQueryDAO == null) {
            this.spanAttachedEventQueryDAO = moduleManager.find(StorageModule.NAME).provider().getService(ISpanAttachedEventQueryDAO.class);
        }
        return spanAttachedEventQueryDAO;
    }
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