/// <summary>
/// Handles the not reachable route.
/// </summary>
/// <param name="nextHopId">The next hop identifier.</param>
/// <param name="frameMessage">The frame message.</param>
private void HandleNotReachableRoute(string nextHopId, DsrFrameMessage frameMessage)
{
var dsrTable = this.Table as DsrTable;
// remove notreachable route
dsrTable?.HandleError(this.Client.Id, nextHopId);
// broadcast route error to neighbors - Neighbors remove every route with sender -> notreachable in path
this.Client.BroadcastMessage(
new DsrRouteErrorMessage()
{
Sender = this.Client.Id, NotReachableNode = nextHopId,
});
if (frameMessage != null)
{
// send route error to sender with back path in message
// receiver removes every route with sender - notreachable in path
this.SendMessage(
new DsrRouteErrorMessage()
{
Sender = this.Client.Id,
Receiver = frameMessage.Sender,
Route = frameMessage.Route,
NotReachableNode = nextHopId,
FailedMessage = frameMessage.Data
});
}
}
/// <summary>
/// Handles the new outgoing message.
/// </summary>
/// <param name="queuedMessage">The queued message.</param>
private void HandleRouteDiscoveryForOutgoingMessage(NetSimQueuedMessage queuedMessage)
{
// search the route for message (also in cache)
var searchedRoute = this.GetDsrRoute(queuedMessage.Message.Receiver);
// if route found - send the message via the connection
if (searchedRoute != null)
{
var sendMessage = queuedMessage.Message;
// pack message in dsrframemessage and set found route
var dsrFrame = new DsrFrameMessage()
{
Data = (NetSimMessage)sendMessage.Clone(),
Receiver = sendMessage.Receiver,
Sender = sendMessage.Sender,
Route = new List <string>(searchedRoute.Route),
};
// determine the next hop of the requested route
var nextHopId = dsrFrame.GetNextHop(this.Client.Id);
// lay message on wire - intial send
if (this.IsConnectionReachable(nextHopId))
{
this.Client.Connections[nextHopId].StartTransportMessage(dsrFrame, this.Client.Id, nextHopId);
}
else
{
this.HandleNotReachableRoute(nextHopId, null);
}
}
else
{
// if route not found and route discovery is not started for this message
if (!queuedMessage.IsRouteDiscoveryStarted)
{
// mark as started
queuedMessage.IsRouteDiscoveryStarted = true;
// broadcast to all neighbors
this.Client.BroadcastMessage(
new DsrRouteRequestMessage()
{
Sender = this.Client.Id,
Receiver = queuedMessage.Message.Receiver,
RequestId = this.CurrentRequestId,
Nodes = { this.Client.Id }
},
false);
// increase route request id
this.CurrentRequestId++;
}
// and enqueue message again
this.OutputQueue.Enqueue(queuedMessage);
}
}
/// <summary>
/// Clones this instance.
/// </summary>
/// <returns>
/// A new object that is a copy of this instance.
/// </returns>
public override object Clone()
{
var clone = new DsrFrameMessage()
{
Route = new List <string>(this.Route),
Data = (NetSimMessage)this.Data.Clone()
};
return(this.CopyTo(clone));
}