/// <summary>
/// Sends a netgram using a supplied route
/// </summary>
/// <param name="route">The route to send with</param>
/// <param name="content">The content to of the netgram to send</param>
private void _sendWithRoute(Route route, NetgramContent content)
{
var destination = content.Destination;
byte portId;
Mac mac;
if (destination.IsGlobalBroadcast())
{
// global broadcast
content.Header.Destination = Address.GlobalBroadcast;
portId = 255;
mac = Mac.Broadcast;
}
else if (destination.IsDirectedlyConnectedBroadcast())
{
// broadcast on all directly connected networks
content.Header.Destination = null;
portId = 255;
mac = Mac.Broadcast;
}
else if (route.NextHop.IsBroadcast())
{
// directly attached network
content.Header.Destination = null;
portId = route.PortId;
mac = destination.Mac;
}
else
{
// not directly attached
content.Header.Destination = destination;
portId = route.PortId;
mac = route.NextHop;
}
OutboundNetgram netgram = new OutboundNetgram();
netgram.PortId = portId;
netgram.Destination = mac;
netgram.Content = content;
if (_portManager != null)
{
_portManager.SendNetgram(netgram);
}
}
/// <summary>
/// Sends an appgram
/// </summary>
/// <param name="appgram">The appgram to send</param>
public void SendAppgram(OutboundAppgram appgram)
{
Contract.Requires(appgram != null);
Contract.Requires(appgram.Destination != null);
Contract.Requires(appgram.Content != null);
var header = new NetgramHeader();
header.Destination = null;
header.Source = null;
header.HopCount = 64;
header.IsNetworkMessage = false;
header.ExpectingReply = appgram.ExpectingReply;
header.Priority = appgram.Priority;
var content = new NetgramContent(appgram.Destination, header, appgram.Content);
lock (_lock)
{
_send(content);
}
}
/// <summary>
/// Sends a netgram containing either a network message or an appgram
/// </summary>
/// <param name="content">The netgram content to send</param>
private void _send(NetgramContent content)
{
var destination = content.Destination;
Route route = null;
if (destination.IsGlobalBroadcast() || destination.IsDirectedlyConnectedBroadcast())
{
// don't need a route, since we are globally broadcasting
_sendWithRoute(null, content);
}
else if ((route = _table.GetRoute(destination.Network)) != null)
{
// we have a route to the destination network, which we can use
_sendWithRoute(route, content);
}
else
{
// we currently have no route to the network, so we
// need to enqueue the netgram and search for this network
_netgramQueue.AddLast(content);
_queueNetworkSearch(destination.Network);
}
}
