/// <summary>
/// AppendStream appends the provides messages to the specified stream.
/// </summary>
/// <param name="streamId">The stream to append to. If the stream does not exists, it will be created.</param>
/// <param name="concurrencyCheck">The optimistic concurrency check. See <see cref="ConcurrencyCheck"/> for different options.</param>
/// <param name="messages">The messages to append.</param>
/// <returns>The position in the stream of the first message that has been written.</returns>
public async Task <long> AppendStream(string streamId, ConcurrencyCheck concurrencyCheck, IEnumerable <MessageInput> messages)
{
var request = new AppendStreamRequest
{
Database = _db,
Stream = streamId,
ExpectedVersion = -2,
};
concurrencyCheck.InterceptRequest(request);
foreach (var m in messages)
{
if (string.IsNullOrEmpty(m.Type))
{
throw new ArgumentNullException(nameof(m.Type), "missing type name");
}
request.Messages.Add(new Wire.MessageInput
{
Type = m.Type,
Header = ByteString.CopyFrom(m.Header ?? new byte[0]),
Value = ByteString.CopyFrom(m.Value ?? new byte[0]),
});
}
var reply = await _client.AppendStreamAsync(request, _metadata);
return(reply.From);
}
internal override void InterceptRequest(AppendStreamRequest request)
{
request.ExpectedVersion = _version;
}