public IEnumerable <TimeSeriesItem> GetTimeSeries(List <string> collectionsToExport)
{
Debug.Assert(_context != null);
var initialState = new TimeSeriesIterationState(_context, _database.Configuration.Databases.PulseReadTransactionLimit)
{
StartEtag = _startDocumentEtag,
StartEtagByCollection = collectionsToExport.ToDictionary(x => x, x => _startDocumentEtag)
};
var enumerator = new PulsedTransactionEnumerator <TimeSeriesItem, TimeSeriesIterationState>(_context,
state =>
{
if (state.StartEtagByCollection.Count != 0)
{
return(GetTimeSeriesFromCollections(_context, state));
}
return(GetAllTimeSeriesItems(_context, state.StartEtag));
}, initialState);
while (enumerator.MoveNext())
{
yield return(enumerator.Current);
}
}
#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
public async IAsyncEnumerable <TimeSeriesItem> GetTimeSeriesAsync(List <string> collectionsToExport)
#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously
{
Debug.Assert(_context != null);
var initialState = new TimeSeriesIterationState(_context, _database.Configuration.Databases.PulseReadTransactionLimit)
{
StartEtag = _startDocumentEtag,
StartEtagByCollection = collectionsToExport.ToDictionary(x => x, x => _startDocumentEtag)
};
var enumerator = new PulsedTransactionEnumerator <TimeSeriesItem, TimeSeriesIterationState>(_context,
state =>
{
if (state.StartEtagByCollection.Count != 0)
{
return(GetTimeSeriesFromCollections(_context, state));
}
return(GetAllTimeSeriesItems(_context, state.StartEtag));
}, initialState);
while (enumerator.MoveNext())
{
yield return(enumerator.Current);
}
}
private static IEnumerable <TimeSeriesItem> GetTimeSeriesFromCollections(DocumentsOperationContext context, TimeSeriesIterationState state)
{
var database = context.DocumentDatabase;
var collections = state.StartEtagByCollection.Keys.ToList();
foreach (var collection in collections)
{
var etag = state.StartEtagByCollection[collection];
state.CurrentCollection = collection;
foreach (var ts in database.DocumentsStorage.TimeSeriesStorage.GetTimeSeriesFrom(context, collection, etag, long.MaxValue))
{
yield return(new TimeSeriesItem
{
Name = database.DocumentsStorage.TimeSeriesStorage.GetOriginalName(context, ts.DocId, ts.Name),
DocId = ts.DocId,
Baseline = ts.Start,
ChangeVector = ts.ChangeVector,
Collection = ts.Collection,
SegmentSize = ts.SegmentSize,
Segment = ts.Segment,
Etag = ts.Etag,
});
}
}
}