func (udc *UpsideDownCouch) batchRows(writer store.KVWriter, addRows []UpsideDownCouchRow, updateRows []UpsideDownCouchRow, deleteRows []UpsideDownCouchRow) (err error) {
// prepare batch
wb := writer.NewBatch()
// add
for _, row := range addRows {
tfr, ok := row.(*TermFrequencyRow)
if ok {
// need to increment counter
dictionaryKey := tfr.DictionaryRowKey()
wb.Merge(dictionaryKey, dictionaryTermIncr)
}
wb.Set(row.Key(), row.Value())
}
// update
for _, row := range updateRows {
wb.Set(row.Key(), row.Value())
}
// delete
for _, row := range deleteRows {
tfr, ok := row.(*TermFrequencyRow)
if ok {
// need to decrement counter
dictionaryKey := tfr.DictionaryRowKey()
wb.Merge(dictionaryKey, dictionaryTermDecr)
}
wb.Delete(row.Key())
}
// write out the batch
err = wb.Execute()
if err != nil {
return
}
return
}
