public Course(string title, StreamValue stream, TypeValue type, DateTime startDate, DateTime endDate)
{
if (String.IsNullOrWhiteSpace(title))
{
throw new ArgumentNullException("title", "Course's title cannot be null or empty!");
}
Title = title;
Stream = stream;
Type = type;
StartDate = startDate;
EndDate = endDate;
}
public static void CreateCell(this StreamValueDTO svd, ref StreamValue sv)
{
if (svd.CellValue.HasValue)
{
sv = new StreamValue(CellValue: svd.CellValue);
}
if (svd.DigitalValue.HasValue)
{
sv = new StreamValue(DigitalValue: svd.DigitalValue);
}
if (svd.NumericValue.HasValue)
{
sv = new StreamValue(NumericValue: svd.NumericValue);
}
if (svd.StringValue != null)
{
sv = new StreamValue(StringValue: svd.StringValue);
}
}
public static void CreateCell(this StreamValueDTO_Accessor svda, ref StreamValue sv)
{
if (svda.Contains_CellValue)
{
sv = new StreamValue(CellValue: svda.CellValue);
}
if (svda.Contains_DigitalValue)
{
sv = new StreamValue(DigitalValue: svda.DigitalValue);
}
if (svda.Contains_NumericValue)
{
sv = new StreamValue(NumericValue: svda.NumericValue);
}
if (svda.Contains_StringValue)
{
sv = new StreamValue(StringValue: svda.StringValue);
}
}
public override void InsertStreamValueHandler(StreamValueCollectionDTOReader request)
{
long streamCellId = request.StreamCellId;
long streamSnapshotCellId;
StreamType streamType;
int indexHeight;
//Stream
using (var streamCell = Storage.UseTempanyStream(streamCellId, CellAccessOptions.ThrowExceptionOnCellNotFound))
{
indexHeight = streamCell.IndexHeight;
streamType = (StreamType)streamCell.ValueType;
streamSnapshotCellId = streamCell.Snapshot;
}
//New values
List <StreamValue> newValueCells = new List <StreamValue>(request.Values.Count);
foreach (var valuesDto in request.Values)
{
StreamValue valueCell = new StreamValue(); //ugly struct hack, unnecessary construction
valuesDto.CreateCell(ref valueCell);
Storage.SaveStreamValue(valueCell);
newValueCells.Add(valueCell);
}
List <long> newValueCellsIds = newValueCells.Select(sv => sv.CellID).ToList();
//New values collection
StreamValueCollection newValues = new StreamValueCollection(newValueCellsIds);
Storage.SaveStreamValueCollection(newValues);
int newLevel = GetRandomLevel(indexHeight);
//Existing snapshot
List <long> existingPreviousPointers;
long existingTimestamp;
long existingValues;
using (var streamSnapshotCell = Storage.UseTimestamp(streamSnapshotCellId, CellAccessOptions.ThrowExceptionOnCellNotFound))
{
existingTimestamp = streamSnapshotCell.Ticks;
existingValues = streamSnapshotCell.Values;
existingPreviousPointers = streamSnapshotCell.Previous;
}
//For now, only support monotonic increasing timestamps
if (request.Timestamp <= existingTimestamp)
{
throw new NotSupportedException("Specified timestamp is earlier than snapshot time. Stream timestamp must be monotonically increasing (CTP limitation).");
}
//New timestamp to hold existing snapshot
List <long> trimmedExistingPreviousPointers = existingPreviousPointers.Take(newLevel).ToList();
Timestamp shiftedExistingSnapshot = new Timestamp(existingTimestamp, existingValues, trimmedExistingPreviousPointers);
Storage.SaveTimestamp(shiftedExistingSnapshot);
//Update existing snapshot
List <long> newPreviousPointers = Enumerable.Range(0, newLevel).Select(i => shiftedExistingSnapshot.CellID).Concat(existingPreviousPointers.Skip(newLevel)).ToList();
using (var streamSnapshotCell = Storage.UseTimestamp(streamSnapshotCellId, CellAccessOptions.ThrowExceptionOnCellNotFound))
{
streamSnapshotCell.Ticks = request.Timestamp;
streamSnapshotCell.Values = newValues.CellID;
streamSnapshotCell.Previous = newPreviousPointers;
}
//update index height if increased
if (newLevel > indexHeight)
{
using (var streamCell = Storage.UseTempanyStream(streamCellId, CellAccessOptions.ThrowExceptionOnCellNotFound))
{
streamCell.IndexHeight = newLevel;
}
}
}
