public int CompareTo(RFCSeqNum value)
{
int delta = this.sequenceNumber - value.sequenceNumber;
if (delta == int.MinValue)
{
// Behavior of comparing 0u-2147483648u, 1u-2147483649u, ...
// is undefined, so we do not allow it.
throw new AmqpException(ErrorCode.NotAllowed
, $"Comparison of {this.sequenceNumber.ToString()} and {value.sequenceNumber.ToString()} is invalid because the result is undefined.");
}
return(delta);
}
private void InterceptFlowFrame(Flow flow)
{
if (!State.CanReceiveFrames())
{
throw new AmqpException(ErrorCode.IllegalState, $"Received Flow frame but session state is {State.ToString()}.");
}
if (State == SessionStateEnum.DISCARDING)
{
return;
}
nextIncomingId = flow.NextOutgoingId; // their next id
remoteOutgoingWindow = flow.OutgoingWindow; // their advertised outgoing window
// recalculate the remote session's advertised incoming-window based on the difference
// between the advertized next-incoming-id and our actual next-outgoing-id
// our outgoing-window is synchronized with the remote-incoming-window
if (flow.NextIncomingId.HasValue)
{
outgoingWindow = remoteIncomingWindow = flow.IncomingWindow + flow.NextIncomingId.Value - (uint)nextOutgoingId;
}
else
{
outgoingWindow = remoteIncomingWindow = flow.IncomingWindow + InitialOutgoingId - (uint)nextOutgoingId;
}
if (outgoingWindow > 0)
{
// TODO: flush queued outgoing transfers
}
if (flow.Handle != null)
{
var link = GetRemoteLink(flow.Handle.Value);
if (link.State == LinkStateEnum.DESTROYED)
{
throw new AmqpException(ErrorCode.ErrantLink, "If any input (other than a detach) related to the endpoint either via the input handle or delivery-ids be received, the session MUST be terminated with an errant-link session-error.");
}
link.HandleLinkFrame(flow);
}
else if (flow.Echo)
{
SendFlow(new Flow()
{
Echo = false,
});
}
}
private void HandleBeginFrame(Begin begin)
{
if (State != SessionStateEnum.UNMAPPED && State != SessionStateEnum.BEGIN_SENT)
{
throw new AmqpException(ErrorCode.IllegalState, $"Received Begin frame but session state is {State.ToString()}.");
}
nextOutgoingId = InitialOutgoingId; // our next id
incomingWindow = DefaultWindowSize; // our incoming window
nextIncomingId = begin.NextOutgoingId; // their next id
outgoingWindow = remoteIncomingWindow = begin.IncomingWindow; // their incoming window (and now our outgoing window)
remoteOutgoingWindow = begin.OutgoingWindow; // their advertized outgoing window
sessionMaxHandle = Math.Min(DefaultMaxHandle, begin.HandleMax ?? DefaultMaxHandle);
if (State == SessionStateEnum.BEGIN_SENT)
{
if (begin.RemoteChannel == null)
{
throw new AmqpException(ErrorCode.InvalidField, "Expecting to receive RemoteChannel");
}
RemoteChannelNumber = begin.RemoteChannel.Value;
State = SessionStateEnum.MAPPED;
return;
}
else
{
State = SessionStateEnum.BEGIN_RCVD;
// reset values and send back the frame
begin.RemoteChannel = RemoteChannelNumber;
begin.NextOutgoingId = nextOutgoingId;
begin.IncomingWindow = incomingWindow;
begin.OutgoingWindow = outgoingWindow;
begin.HandleMax = sessionMaxHandle;
Connection.SendFrame(begin, ChannelNumber);
State = SessionStateEnum.MAPPED;
return;
}
}
private void InterceptTransferFrame(Transfer transfer, ByteBuffer buffer)
{
if (!State.CanReceiveFrames())
{
throw new AmqpException(ErrorCode.IllegalState, $"Received Transfer frame but session state is {State.ToString()}.");
}
if (State == SessionStateEnum.DISCARDING)
{
return;
}
if (incomingWindow == 0)
{
// received a transfer frame when our incoming window is at zero
throw new AmqpException(ErrorCode.WindowViolation, "incoming-window is 0");
}
nextIncomingId++;
if (transfer.DeliveryId.HasValue)
{
nextIncomingId = transfer.DeliveryId.Value + 1;
}
remoteOutgoingWindow--;
incomingWindow--; // TODO: do we want to handle flow control?
if (incomingWindow == 0)
{
// TODO: ... do we just reset the window like AMQPlite?
}
var link = GetRemoteLink(transfer.Handle);
if (link.State == LinkStateEnum.DESTROYED)
{
throw new AmqpException(ErrorCode.ErrantLink, "If any input (other than a detach) related to the endpoint either via the input handle or delivery-ids be received, the session MUST be terminated with an errant-link session-error.");
}
link.HandleLinkFrame(transfer, buffer);
}
public AmqpSession(AmqpConnection connection, ushort channelNumber, ushort remoteChannelNumber)
{
this.Connection = connection;
this.ChannelNumber = channelNumber;
this.RemoteChannelNumber = remoteChannelNumber;
State = SessionStateEnum.UNMAPPED;
nextOutgoingId = InitialOutgoingId;
}
private void InterceptTransferFrame(Transfer transfer, ByteBuffer buffer)
{
if (!State.CanReceiveFrames())
throw new AmqpException(ErrorCode.IllegalState, $"Received Transfer frame but session state is {State.ToString()}.");
if (State == SessionStateEnum.DISCARDING)
return;
if (incomingWindow == 0)
{
// received a transfer frame when our incoming window is at zero
throw new AmqpException(ErrorCode.WindowViolation, "incoming-window is 0");
}
nextIncomingId++;
if (transfer.DeliveryId.HasValue)
{
nextIncomingId = transfer.DeliveryId.Value + 1;
}
remoteOutgoingWindow--;
incomingWindow--; // TODO: do we want to handle flow control?
if (incomingWindow == 0)
{
// TODO: ... do we just reset the window like AMQPlite?
}
var link = GetRemoteLink(transfer.Handle);
if (link.State == LinkStateEnum.DESTROYED)
throw new AmqpException(ErrorCode.ErrantLink, "If any input (other than a detach) related to the endpoint either via the input handle or delivery-ids be received, the session MUST be terminated with an errant-link session-error.");
link.HandleLinkFrame(transfer, buffer);
}
private void InterceptFlowFrame(Flow flow)
{
if (!State.CanReceiveFrames())
throw new AmqpException(ErrorCode.IllegalState, $"Received Flow frame but session state is {State.ToString()}.");
if (State == SessionStateEnum.DISCARDING)
return;
nextIncomingId = flow.NextOutgoingId; // their next id
remoteOutgoingWindow = flow.OutgoingWindow; // their advertised outgoing window
// recalculate the remote session's advertised incoming-window based on the difference
// between the advertized next-incoming-id and our actual next-outgoing-id
// our outgoing-window is synchronized with the remote-incoming-window
if (flow.NextIncomingId.HasValue)
outgoingWindow = remoteIncomingWindow = flow.IncomingWindow + flow.NextIncomingId.Value - (uint)nextOutgoingId;
else
outgoingWindow = remoteIncomingWindow = flow.IncomingWindow + InitialOutgoingId - (uint)nextOutgoingId;
if (outgoingWindow > 0)
{
// TODO: flush queued outgoing transfers
}
if (flow.Handle != null)
{
var link = GetRemoteLink(flow.Handle.Value);
if (link.State == LinkStateEnum.DESTROYED)
throw new AmqpException(ErrorCode.ErrantLink, "If any input (other than a detach) related to the endpoint either via the input handle or delivery-ids be received, the session MUST be terminated with an errant-link session-error.");
link.HandleLinkFrame(flow);
}
else if (flow.Echo)
{
SendFlow(new Flow()
{
Echo = false,
});
}
}
private void HandleBeginFrame(Begin begin)
{
if (State != SessionStateEnum.UNMAPPED && State != SessionStateEnum.BEGIN_SENT)
throw new AmqpException(ErrorCode.IllegalState, $"Received Begin frame but session state is {State.ToString()}.");
nextOutgoingId = InitialOutgoingId; // our next id
incomingWindow = DefaultWindowSize; // our incoming window
nextIncomingId = begin.NextOutgoingId; // their next id
outgoingWindow = remoteIncomingWindow = begin.IncomingWindow; // their incoming window (and now our outgoing window)
remoteOutgoingWindow = begin.OutgoingWindow; // their advertized outgoing window
sessionMaxHandle = Math.Min(DefaultMaxHandle, begin.HandleMax ?? DefaultMaxHandle);
if (State == SessionStateEnum.BEGIN_SENT)
{
if (begin.RemoteChannel == null)
{
throw new AmqpException(ErrorCode.InvalidField, "Expecting to receive RemoteChannel");
}
RemoteChannelNumber = begin.RemoteChannel.Value;
State = SessionStateEnum.MAPPED;
return;
}
else
{
State = SessionStateEnum.BEGIN_RCVD;
// reset values and send back the frame
begin.RemoteChannel = RemoteChannelNumber;
begin.NextOutgoingId = nextOutgoingId;
begin.IncomingWindow = incomingWindow;
begin.OutgoingWindow = outgoingWindow;
begin.HandleMax = sessionMaxHandle;
Connection.SendFrame(begin, ChannelNumber);
State = SessionStateEnum.MAPPED;
return;
}
}
