private void UpdateRoute(TopologyEntry newEntry)
{
lock (tablesLock)
{
var oldEntry = RoutingTable.FirstOrDefault(r => r.Destination.Equals(newEntry.Destination));
if (oldEntry == null && newEntry.Feasible != -1)
{
RoutingTable.Add(new RouteEntry(newEntry.Destination, newEntry.Neighbor, DateTime.Now));
}
else
{
var fastest = TopologyTable.Where(t => t.Destination.Equals(newEntry.Destination)).OrderBy(t => t.Feasible).FirstOrDefault();
if (fastest == null)
{
RoutingTable.Remove(oldEntry);
}
else if (!oldEntry.Neighbor.Equals(fastest.Neighbor))
{
RoutingTable.Remove(oldEntry);
RoutingTable.Add(new RouteEntry(fastest.Destination, fastest.Neighbor, DateTime.Now));
}
}
}
}
public void AddTopology(TopologyEntry entry)
{
/*
* if(entry.Feasible == -1)
* {
* //remove topology
* lock(tablesLock)
* {
* var existing = TopologyTable.FirstOrDefault(t => t.Destination.Equals(entry.Destination) && t.Neighbor.Equals(entry.Neighbor));
* if(existing != null)
* {
* TopologyTable.Remove(existing);
* UpdateRoute(entry);
* }
* return;
* }
* }
*/
if (entry.Destination.Equals(Text))
{
return;
}
if (entry.Feasible != -1)
{
lock (tablesLock)
{
var fastest = TopologyTable.Where(t => t.Destination.Equals(entry.Destination))?.OrderBy(t => t.Feasible).FirstOrDefault();
if (fastest != null && entry.Advertised >= fastest.Feasible)
{
return;
}
var existing = TopologyTable.Where(t => t.Destination.Equals(entry.Destination) && t.Neighbor.Equals(entry.Neighbor) && t.Feasible == entry.Feasible).FirstOrDefault();
if (existing != null)
{
return;
}
TopologyTable.Add(entry);
}
}
else
{
lock (tablesLock)
{
var existing = TopologyTable.FirstOrDefault(t => t.Destination.Equals(entry.Destination) && t.Neighbor.Equals(entry.Neighbor));
if (existing != null)
{
TopologyTable.Remove(existing);
}
}
}
UpdateRoute(entry);
var neighbors = NeighborhoodTable.Where(n => !n.Address.Equals(entry.Neighbor)).ToList();
foreach (var neighbor in neighbors)
{
var node = Nodes.FirstOrDefault(n => (n as RouterNode).Text.Equals(neighbor.Address)) as RouterNode;
var link = Links.FirstOrDefault(l => l.ToNode.Equals(node) || l.FromNode.Equals(node)) as GoLabeledLink;
if (node == null || link == null)
{
continue;
}
TopologyEntry fastest;
lock (tablesLock)
{
fastest = TopologyTable.Where(t => t.Destination.Equals(entry.Destination)).OrderBy(t => t.Feasible).FirstOrDefault();
}
node.AddTopology(new TopologyEntry(entry.Destination, Text, fastest == null ? -1 : fastest.Feasible + link.UserFlags, fastest.Feasible));
}
}
