public static AmqpLinkSettings Create(Attach attach)
{
AmqpLinkSettings settings = new AmqpLinkSettings();
settings.LinkName = attach.LinkName;
settings.Role = !attach.Role.Value;
settings.Source = attach.Source;
settings.Target = attach.Target;
settings.SndSettleMode = attach.SndSettleMode;
settings.RcvSettleMode = attach.RcvSettleMode;
settings.MaxMessageSize = attach.MaxMessageSize;
settings.Properties = attach.Properties;
if (settings.Role.Value)
{
settings.TransferLimit = AmqpConstants.DefaultLinkCredit;
}
else
{
settings.InitialDeliveryCount = 0;
}
return settings;
}
public static Attach Clone(this Attach attach)
{
Attach clone = new Attach();
clone.LinkName = attach.LinkName;
clone.Role = attach.Role;
clone.SndSettleMode = attach.SndSettleMode;
clone.RcvSettleMode = attach.RcvSettleMode;
clone.Source = attach.Source;
clone.Target = attach.Target;
clone.Unsettled = attach.Unsettled;
clone.IncompleteUnsettled = attach.IncompleteUnsettled;
clone.InitialDeliveryCount = attach.InitialDeliveryCount;
clone.MaxMessageSize = attach.MaxMessageSize;
clone.OfferedCapabilities = attach.OfferedCapabilities;
clone.DesiredCapabilities = attach.DesiredCapabilities;
clone.Properties = attach.Properties;
return clone;
}
bool TryCreateRemoteLink(Attach attach, out AmqpLink link)
{
link = null;
AmqpLinkSettings linkSettings = AmqpLinkSettings.Create(attach);
try
{
link = this.linkFactory.CreateLink(this, linkSettings);
link.RemoteHandle = attach.Handle;
this.linksByRemoteHandle.Add(attach.Handle.Value, link);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
attach.Source = null;
attach.Target = null;
this.SendCommand(attach);
if (link != null)
{
link.TryClose(exception);
}
return false;
}
return true;
}
Error Negotiate(Attach attach)
{
if (attach.MaxMessageSize.HasValue && attach.MaxMessageSize.Value != 0)
{
this.settings.MaxMessageSize = this.settings.MaxMessageSize.HasValue ?
Math.Min(this.settings.MaxMessageSize.Value, attach.MaxMessageSize.Value) :
attach.MaxMessageSize.Value;
}
return null;
}
void OnReceiveAttach(Attach attach)
{
StateTransition stateTransition;
this.TransitState("R:ATTACH", StateTransition.ReceiveOpen, out stateTransition);
Error error = this.Negotiate(attach);
if (error != null)
{
this.OnLinkOpenFailed(new AmqpException(error));
return;
}
if (stateTransition.From == AmqpObjectState.OpenSent)
{
if (this.IsReceiver)
{
Source source = this.settings.Source as Source;
if (source != null && source.Dynamic())
{
source.Address = ((Source)attach.Source).Address;
}
}
else
{
Target target = this.settings.Target as Target;
if (target != null && target.Dynamic())
{
target.Address = ((Target)attach.Target).Address;
}
}
}
if (stateTransition.To == AmqpObjectState.Opened)
{
if ((this.IsReceiver && attach.Source == null) ||
(!this.IsReceiver && attach.Target == null))
{
// not linkendpoint was created on the remote side
// a detach should be sent immediately by peer with error
return;
}
if (this.IsReceiver)
{
this.deliveryCount = attach.InitialDeliveryCount.Value;
this.settings.Source = attach.Source;
}
else
{
this.settings.Target = attach.Target;
}
this.CompleteOpen(false, null);
}
else if (stateTransition.To == AmqpObjectState.OpenReceived)
{
Utils.Trace(TraceLevel.Verbose, "{0}: opending.", this);
try
{
this.Session.Connection.AmqpSettings.RuntimeProvider.BeginOpenLink(this, this.DefaultOpenTimeout, this.OnProviderLinkOpened, null);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
this.OnLinkOpenFailed(exception);
}
}
}
