public async Task <FetchEventsResult> FetchStreamEvents(string stream, EventStreamHeader header, StreamVersion fromVersion, int sliceSize)
{
// fromVersion already in slice
var isFetchingCompleted = false;
var nextSliceVersion = fromVersion.Increment(sliceSize - 1);
if (nextSliceVersion >= header.Version)
{
nextSliceVersion = header.Version;
isFetchingCompleted = true;
}
const string queryTemplate =
"((PartitionKey eq '{0}') and (RowKey eq 'HEAD')) or " +
"((PartitionKey eq '{0}') and (RowKey ge '{1}' and RowKey le '{2}'))";
var query = m_table.PrepareEntityFilterRangeQuery(
queryTemplate.FormatString(
stream,
fromVersion.ToString(),
nextSliceVersion.ToString()));
var queryResult = await query.ExecuteAsync();
var events = new SortedList <StreamVersion, JournaledEvent>(sliceSize);
foreach (var properties in queryResult)
{
var rowKey = (string)properties[KnownProperties.RowKey];
if (!rowKey.EqualsCi("HEAD"))
{
events.Add(StreamVersion.Parse((string)properties[KnownProperties.RowKey]), JournaledEvent.Create(properties));
}
}
return(new FetchEventsResult(isFetchingCompleted, events));
}
private static string GetRowKey(string streamName, StreamVersion streamVersion)
{
return("{0}|{1}".FormatString(streamName, streamVersion.ToString()));
}
private async Task<SortedList<StreamVersion, JournaledEvent>> FetchEvents(
string stream,
StreamVersion fromVersion,
StreamVersion toVersion,
int sliceSize)
{
var nextSliceVersion = fromVersion.Increment(sliceSize);
if (nextSliceVersion >= toVersion)
{
nextSliceVersion = toVersion;
}
var query = m_table.PrepareEntityFilterRangeQuery(
"(PartitionKey eq '{0}') and (RowKey ge '{1}' and RowKey le '{2}')".FormatString(
stream,
fromVersion.ToString(),
nextSliceVersion.ToString()), JournaledEventPropertyNames.All);
var queryResult = await query.ExecuteAsync();
var result = new SortedList<StreamVersion, JournaledEvent>(sliceSize);
foreach (var properties in queryResult)
{
result.Add(StreamVersion.Parse((string)properties[KnownProperties.RowKey]), JournaledEvent.Create(properties));
}
return result;
}