/// <summary>
/// Clones this instance.
/// </summary>
/// <returns>The cloned instance.</returns>
public override object Clone()
{
var clone = new DsrRouteReplyMessage()
{
Route = new List <string>(this.Route)
};
return(this.CopyTo(clone));
}
/// <summary>
/// Handles the response.
/// </summary>
/// <param name="message">The message.</param>
public void HandleResponse(DsrRouteReplyMessage message)
{
// search for a route for this destination
var entry = this.GetRouteFor(message.Sender);
// if no route found or the metric of the found route is bigger
if (entry == null || entry.Metric > message.Route.Count - 1)
{
this.Entries.Add(
new DsrTableEntry()
{
Destination = message.Sender,
Metric = message.Route.Count - 1,
Route = new List <string>(message.Route)
});
}
}
/// <summary>
/// Handles the request route caching.
/// </summary>
/// <param name="repMessage">The rep message.</param>
/// <param name="clientId">The client identifier.</param>
public void HandleReplyRouteCaching(DsrRouteReplyMessage repMessage, string clientId)
{
// search for already cached route
var route = (DsrTableEntry)this.GetRouteFor(repMessage.Sender);
// skip the route until the own id is found in it - the rest is the path to the endpointFrom
var cachedRoute = repMessage.Route.SkipWhile(e => !e.Equals(clientId)).ToList();
// if route is empty drop
if (cachedRoute.Count == 0)
{
return;
}
if (route == null)
{
// add route to table
this.Entries.Add(
new DsrTableEntry()
{
Destination = repMessage.Sender,
Route = cachedRoute,
Metric = cachedRoute.Count - 1
});
}
else
{
// check if new route is shorter
if (cachedRoute.Count - 1 < route.Metric)
{
// remove route and add new one
this.Entries.Remove(route);
// add new route
this.Entries.Add(
new DsrTableEntry()
{
Destination = repMessage.Sender,
Route = cachedRoute,
Metric = cachedRoute.Count - 1
});
}
}
}
private void IncomingDsrRouteReplyMessageHandler(NetSimMessage message)
{
DsrTable dsrTable = this.Table as DsrTable;
DsrRouteReplyMessage repMessage = (DsrRouteReplyMessage)message;
// handle route caching
dsrTable?.HandleReplyRouteCaching(repMessage, this.Client.Id);
// check if the respone is for this node
if (repMessage.Receiver.Equals(this.Client.Id))
{
// save found route to table
dsrTable?.HandleResponse(repMessage);
}
else
{
// forward message
this.SendMessage(repMessage);
}
}
private void IncomingDsrRouteRequestMessageHandler(NetSimMessage message)
{
DsrTable dsrTable = (DsrTable)this.Table;
DsrRouteRequestMessage reqMessage = (DsrRouteRequestMessage)message;
// if duplicate
if (this.HasCachedRequest(reqMessage))
{
// ignore message and proceed
return;
}
// add request to cache
this.AddCachedRequest(reqMessage);
// add this node id to message Route
reqMessage.Nodes.Add(this.Client.Id);
// if this node was sender of request - ignore
if (this.IsOwnRequest(reqMessage))
{
return;
}
// cache route
dsrTable.HandleRequestRouteCaching(reqMessage);
// check if message destination is current node (me)
if (reqMessage.Receiver.Equals(this.Client.Id))
{
// send back rrep mesage the reverse way with found route
var response = new DsrRouteReplyMessage()
{
Receiver = reqMessage.Sender,
Sender = this.Client.Id,
Route = new List <string>(reqMessage.Nodes)
};
// enqueue message for sending
this.SendMessage(response);
return;
}
else
{
// Check if route to the end destination for request is cached
var route = this.Table.GetRouteFor(reqMessage.Receiver);
if (route != null)
{
var dsrRoute = (DsrTableEntry)route;
var newRoute = new List <string>(reqMessage.Nodes);
// remove last entry
newRoute.RemoveAt(newRoute.Count - 1);
// add cached route entries
newRoute.AddRange(dsrRoute.Route);
// send back rrep mesage the reverse way with found route
// note: sender is the orig. receiver of the req
var response = new DsrRouteReplyMessage()
{
Receiver = reqMessage.Sender,
Sender = reqMessage.Receiver,
Route = newRoute
};
// enqueue message for sending
this.SendMessage(response);
return;
}
}
// forward message to outgoing messages
this.SendMessage(reqMessage);
}