public async Task <EventRecord[]> LoadAsync(Guid streamId, int fromVersion, bool pessimisticLock, CancellationToken cancellationToken = new CancellationToken())
{
List <EventRecord> list = null;
using (var cnn = new SqlConnection(_connectionString))
{
using (var cmd = await cnn.OpenAndCreateCommandAsync(SqlQueries.SelectEvents.Query, cancellationToken).NotOnCapturedContext())
{
cmd
.AddInputParam(SqlQueries.SelectEvents.ParamStreamId, DbType.Guid, streamId)
.AddInputParam(SqlQueries.SelectEvents.ParamFromVersion, DbType.Int32, fromVersion)
.AddInputParam(SqlQueries.SelectEvents.ParamPessimisticLock, DbType.Boolean, pessimisticLock);
using (var reader = await cmd.ExecuteReaderAsync(CommandBehavior.SequentialAccess, cancellationToken).NotOnCapturedContext())
{
if (reader.HasRows)
{
list = new List <EventRecord>(100);
}
while (await reader.ReadAsync(cancellationToken).NotOnCapturedContext()) // read snapshot
{
if (await reader.IsDBNullAsync(colIndexForContractName, cancellationToken).NotOnCapturedContext())
{
break;
}
list.Add(EventRecord.Snapshot(
await reader.GetFieldValueAsync <string>(colIndexForContractName, cancellationToken).NotOnCapturedContext(),
await reader.GetFieldValueAsync <int>(colIndexForVersion, cancellationToken).NotOnCapturedContext(),
await reader.GetFieldValueAsync <byte[]>(colIndexForPayload, cancellationToken).NotOnCapturedContext()));
}
await reader.NextResultAsync(cancellationToken).NotOnCapturedContext();
if (list == null && reader.HasRows)
{
list = new List <EventRecord>(30);
}
while (await reader.ReadAsync(cancellationToken).NotOnCapturedContext()) // read events
{
list.Add(EventRecord.Event(
await reader.GetFieldValueAsync <string>(colIndexForContractName, cancellationToken).NotOnCapturedContext(),
await reader.GetFieldValueAsync <int>(colIndexForVersion, cancellationToken).NotOnCapturedContext(),
await reader.GetFieldValueAsync <byte[]>(colIndexForPayload, cancellationToken).NotOnCapturedContext()));
}
}
}
}
return(list?.ToArray() ?? new EventRecord[0]);
}
private static EventRecord CreateEventObject(InMemoryEventRecord arg)
{
return(EventRecord.Event(arg.ContractName, arg.Version, arg.EventData));
}
public EventRecord[] Load(Guid streamId, int fromVersion, bool pessimisticLock)
{
List <EventRecord> list = null;
try
{
using (var cnn = new SqlConnection(_connectionString))
{
using (var cmd = cnn.OpenAndCreateCommand(SqlQueries.SelectEvents.Query))
{
cmd
.AddInputParam(SqlQueries.SelectEvents.ParamStreamId, DbType.Guid, streamId)
.AddInputParam(SqlQueries.SelectEvents.ParamFromVersion, DbType.Int32, fromVersion)
.AddInputParam(SqlQueries.SelectEvents.ParamPessimisticLock, DbType.Boolean, pessimisticLock);
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
if (reader.HasRows)
{
list = new List <EventRecord>(100);
}
while (reader.Read()) // read snapshot
{
if (reader[0] == DBNull.Value)
{
break;
}
list.Add(EventRecord.Snapshot(
reader.GetString(colIndexForContractName),
reader.GetInt32(colIndexForVersion),
GetBytes(reader)));
}
reader.NextResult();
if (list == null && reader.HasRows)
{
list = new List <EventRecord>(30);
}
while (reader.Read()) // read events
{
list.Add(EventRecord.Event(
reader.GetString(colIndexForContractName),
reader.GetInt32(colIndexForVersion),
GetBytes(reader)));
}
}
}
}
}
catch (SqlException ex)
{
if (ex.IsStreamNotLockable())
{
throw new InvalidOperationException($"Can not load and lock stream {streamId} because it is not created with param 'isLockable' set to true.", ex);
}
throw;
}
return(list?.ToArray() ?? new EventRecord[0]);
}
