public byte ReadHeader(ITransport trans, HeaderParams param, OperationsFactory opFac, HotRodOperation op)
{
byte magic = trans.ReadByte(); //Reads magic byte: indicates whether the header is a request or a response
if (magic != HotRodConstants.RESPONSE_MAGIC)
{
String message = "Invalid magic number! Expected " + HotRodConstants.RESPONSE_MAGIC + "received " + magic;
InvalidResponseException e = new InvalidResponseException(message);
logger.Warn(e);
throw e;
}
long receivedMessageId = trans.ReadVLong(); //Reads the message ID. Should be similar to the msg ID of the request
if (receivedMessageId != param.Messageid && receivedMessageId != 0)
{
String message = "Invalid Message ID! Expected " + param.Messageid + "received " + receivedMessageId;
InvalidResponseException e = new InvalidResponseException(message);
logger.Warn(e);
throw new InvalidResponseException(message);
}
byte receivedOpCode = trans.ReadByte(); //Reads the OP Code
logger.Trace(String.Format("response code recieved = " + receivedOpCode));
if (receivedOpCode != param.OpRespCode) //Checks whether the recieved OP code is the corrsponding OPCode for the request sent
{
if (receivedOpCode == HotRodConstants.ERROR_RESPONSE) //In case of any error indication by the server
{
logger.Warn(String.Format("Error Response Recieved : " + receivedOpCode));
throw new InvalidResponseException("Error Response Recieved");
}
logger.Warn(String.Format("Invalid Response Recieved : Expected " + param.OpRespCode + " Recieved " + receivedOpCode));
throw new InvalidResponseException("Invalid Response Operation.");
}
byte status = trans.ReadByte(); //Reads the status
logger.Trace(String.Format("Status : " + status));
byte topchange = trans.ReadByte(); //Reads the Topology change byte. Equals 0 for No Change in topology
logger.Trace(String.Format("Topology change indicator value : " + topchange));
int newTopology = param.Topologyid;
if (topchange == 1)
ReadNewTopologyAndHash(trans, param, opFac, op);
return status;
}