private void save(final Stats stats) {
    db.thenApply(db -> {
        try {
            final Sample sample = db.createSample();
            sample.setValue("projects!", stats.projects.get());
            sample.setValue("sources!", stats.sources.get());
            sample.setValue("processors!", stats.processors.get());
            sample.setValue("endpoints!", stats.endpoints.get());
            stats.facets.forEach((k, v) -> sample.setValue(k + '!', v.get()));
            sample.update();
            savedData = true;
            log.debug("Updated RRD storage");

            final long autoDumpTimeout = config.getAutoDumpTimeout();
            long now;
            if (autoDumpTimeout > 0 && ((now = System.currentTimeMillis()) - lastDump) > autoDumpTimeout) {
                doDump(db);
                lastDump = now;
            }
        } catch (final IOException e) {
            log.error(e.getMessage() + ", stats: " + stats, e);
        }
        return db;
    });
}