public boolean isZero() {
            return refStreamDefsDeletedCount == 0
                   && refStreamDefsFailedCount == 0
                   && refStreamPurgeCounts.isZero();
        }
For use in testing at SMALL scale. Dumps the content of each DB to the logger.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/offheapstore/RefDataOffHeapStore.java