public async Task <MultiTaggedReadResult <TEntry, TMeasureType> > ReadGroupsAsync(string measureTypeName, IEnumerable <AggregatedField> fields, IEnumerable <KeyValuePair <string, string> > requiredTags, IEnumerable <string> groupByTags, Sort sort = Sort.Descending)
{
using (await _cc.ReadAsync().ConfigureAwait(false))
{
await CreateDatabase().ConfigureAwait(false);
requiredTags = requiredTags.ToList();
groupByTags = groupByTags.ToList();
var measureType = await _typeStorage.GetMeasureTypeAsync(measureTypeName).ConfigureAwait(false);
var fieldQueryInfos = GetFieldQueryInfos(measureType, fields.ToArray());
var resultSet = await _client.ReadAsync <DynamicInfluxRow>(_database, CreateGroupedSelectQuery( measureType, fieldQueryInfos, requiredTags, groupByTags, sort )).ConfigureAwait(false);
return(Convert(measureType, fieldQueryInfos, resultSet, sort));
}
}
private async Task <MultiTaggedReadResult <TEntry, TMeasureType> > MergeTaggedResultsAsync(
string measureTypeName,
AggregatedField[] fields,
Sort sort,
List <MultiTaggedReadResult <TEntry, TMeasureType> > results)
{
if (results.Count == 1)
{
return(results[0]);
}
else
{
// figure out which to merge together
var finalResultDictionary = new Dictionary <TagCollection, TaggedReadResult <TEntry, TMeasureType> >();
// foreach tag combination!
var groupings = new Dictionary <TagCollection, List <TaggedReadResult <TEntry, TMeasureType> > >();
TMeasureType measureType = default(TMeasureType);
bool anyResults = false;
foreach (var multiTaggedReadResult in results)
{
measureType = multiTaggedReadResult.MeasureType;
foreach (var taggedReadResult in multiTaggedReadResult)
{
anyResults = true;
List <TaggedReadResult <TEntry, TMeasureType> > existingList;
if (!groupings.TryGetValue(taggedReadResult.GroupedTags, out existingList))
{
existingList = new List <TaggedReadResult <TEntry, TMeasureType> >();
groupings.Add(taggedReadResult.GroupedTags, existingList);
}
existingList.Add(taggedReadResult);
}
}
if (anyResults)
{
// need fields and aggregate method
var calculators = CreateFieldCalculators(fields, measureType.GetFields().ToDictionary(x => x.Key));
return(Merge(measureType, calculators, sort, groupings));
}
else
{
measureType = await _typedKeyStorage.GetMeasureTypeAsync(measureTypeName);
return(new MultiTaggedReadResult <TEntry, TMeasureType>(measureType));
}
}
}