public void Encode(object obj, Stream stream)
{
var msg = obj as Datagram;
if (msg == null)
{
return;
}
int start = (int)stream.Position;
int headerStart = start + RemotingHeader.LengthFieldLen;
stream.Position = headerStart;
byte[] buffer = new byte[4];
EncodeHeader(msg.Header, buffer, stream);
int headerSize = (int)stream.Position - headerStart;
msg.WriteBody(stream);
int end = (int)stream.Position;
int total = end - start - RemotingHeader.TotalSizeLen;
stream.Position = start;
ByteBufHelper.WriteInt32(total, buffer, stream);
ByteBufHelper.WriteInt16((short)headerSize, buffer, stream);
stream.Position = end;
}
private void SerializeMessage(BaseMessage message, Stream output)
{
var crcIndex = (int)output.Position;
output.Position = crcIndex + 8; //这里预留8保存crc信息
var messageStart = (int)output.Position;
Flag flag = Flags.GetMessageFlags(message);
// flag
ByteBufHelper.WriteByte((byte)flag, output);
byte[] buffer = new byte[8];
// created time
ByteBufHelper.WriteInt64(message.CreatedTime.Value.ToTime(), buffer, output);
if (Flags.IsDelayMessage(flag))
{
//Schedule Time
ByteBufHelper.WriteInt64(message.ScheduleReceiveTime.Value.ToTime(), buffer, output);
}
else
{
// expired time
ByteBufHelper.WriteInt64(message.ExpiredTime.Value.ToTime(), buffer, output);
}
// subject
ByteBufHelper.WriteString(message.Subject, buffer, output);
// message id
ByteBufHelper.WriteString(message.MessageId, buffer, output);
WriteTags(flag, message, output);
//记录当前指针位置
int writerIndex = (int)output.Position;
int bodyStart = writerIndex + 4;
output.Position = bodyStart;
//指针 预留4个位置开始写 Attrs
SerializeMap(message.Attrs, buffer, output);
int end = (int)output.Position;
int bodyLen = end - bodyStart;
int messageLength = end - messageStart;
output.Position = writerIndex;
//记录 body 的长度
ByteBufHelper.WriteInt32(bodyLen, buffer, output);
//write crc32
output.Position = crcIndex;
ByteBufHelper.WriteInt64(Crc32.GetCRC32(output, messageStart, messageLength), buffer, output);
//指针重置到尾端
output.Position = end;
}
private void EncodeHeader(RemotingHeader header, byte[] buffer, Stream stream)
{
ByteBufHelper.WriteInt32(RemotingHeader.QmqMagicCode, buffer, stream);
ByteBufHelper.WriteInt16(header.Code, buffer, stream);
ByteBufHelper.WriteInt16(header.Version, buffer, stream);
ByteBufHelper.WriteInt32(header.Opaque, buffer, stream);
ByteBufHelper.WriteInt32(header.Flag, buffer, stream);
ByteBufHelper.WriteInt16(header.RequestCode, buffer, stream);
}
public void Write(Stream output)
{
byte[] buffer = new byte[8];
ByteBufHelper.WriteString(_request.Subject, buffer, output);
ByteBufHelper.WriteString(_request.Group, buffer, output);
ByteBufHelper.WriteString(_request.ConsumerId, buffer, output);
ByteBufHelper.WriteInt32(_request.BatchSize, buffer, output);
ByteBufHelper.WriteInt64(_request.Offset, buffer, output);
ByteBufHelper.WriteInt64(_request.PullOffsetBegin, buffer, output);
ByteBufHelper.WriteInt64(_request.PullOffsetEnd, buffer, output);
ByteBufHelper.WriteInt64(_request.TimeoutMillis, buffer, output);
ByteBufHelper.WriteByte(_request.IsBroadcast, output);
WriteTags(_request, buffer, output);
}