public static bool CanReceiveFrames(this SessionStateEnum state)
{
return(state == SessionStateEnum.BEGIN_RCVD ||
state == SessionStateEnum.MAPPED ||
state == SessionStateEnum.END_SENT ||
state == SessionStateEnum.DISCARDING);
}
private void Init()
{
SessionState = SessionStateEnum.Running;
CreateModules();
InitModules();
Inited = true;
}
protected override void UnloadData()
{
SessionState = SessionStateEnum.Unloading;
UnloadModules();
}
public override void LoadData()
{
SessionState = SessionStateEnum.Loading;
LoadModules();
}
public static bool CanSendFrames(this SessionStateEnum state)
{
return(state == SessionStateEnum.BEGIN_SENT ||
state == SessionStateEnum.MAPPED ||
state == SessionStateEnum.END_RCVD);
}
private void UnmapSession()
{
// TODO: detach links
State = SessionStateEnum.UNMAPPED;
Connection.NotifySessionUnmapped(this);
}
private void HandleEndFrame(End end)
{
if (State != SessionStateEnum.MAPPED && State != SessionStateEnum.END_SENT && State != SessionStateEnum.DISCARDING)
throw new AmqpException(ErrorCode.IllegalState, $"Received End frame but session state is {State.ToString()}.");
if (end.Error != null)
{
trace.Debug("Ending Session {0} Due to Error From Remote Session: '{1}'", ChannelNumber, end.Error);
}
// TODO detach links
if (State == SessionStateEnum.MAPPED)
State = SessionStateEnum.END_RCVD;
EndSession(error: null); // don't pass the error: that's only if the error occured in our session
}
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;
}
}
public void EndSession(Error error)
{
if (State == SessionStateEnum.MAPPED
|| State == SessionStateEnum.END_RCVD
|| State == SessionStateEnum.DISCARDING)
{
Connection.SendFrame(new End()
{
Error = error,
}, ChannelNumber);
if (State == SessionStateEnum.MAPPED)
{
State = SessionStateEnum.END_SENT;
if (error != null)
State = SessionStateEnum.DISCARDING;
}
else if (State == SessionStateEnum.END_RCVD || State == SessionStateEnum.DISCARDING)
{
UnmapSession();
}
return;
}
if (error != null)
{
// no session to end, so close the connection
Connection.CloseConnection(error);
return;
}
}
