private static void printDiamond(UInt32 pointASN, UInt32 stub, List <UInt32> competitors, SecureSimulator.NetworkGraph g, StreamWriter output)
{
SecureSimulator.AsNode pointASNode = g.GetNode(pointASN);
SecureSimulator.AsNode stubASNode = g.GetNode(stub);
foreach (UInt32 c in competitors)
{
SecureSimulator.AsNode cASNode = g.GetNode(c);
output.WriteLine("{0} {1} {2} {3} {4}", pointASN,
relationshipToString(cASNode.GetRelationshipTypeOfNeighbor(pointASNode)),
c,
relationshipToString(stubASNode.GetRelationshipTypeOfNeighbor(cASNode)),
stub);
}
}
/// <summary>
/// Extension method on the NetworkGraph class that performs a [modified] BFS on the
/// specified graph from the specified source ndoe. The allowedRelationships specifies
/// which edges may be traversed during the BFS.
/// This algorithm breaks ties by picking the node with the lower node number.
/// This algorithm allows you to execute multiple BFS iterations on a single graph, with the
/// constraint that any previous BFS trees created in a prior BFS run will not be modified (only
/// added to).
/// If limitedDiscovery is true, the BFS will only find new nodes that are 1 edge away from any existing
/// BFS tree.
/// If includeSibling is true, then ties are broken by first taking non-siblings over siblings.
///
/// Modified by PGill Oct. 2010 to take in references to the Best, BucketTable and ChosenPaths sets. The function
/// was also modified to populate these for our new sims.
/// </summary>
public static void ExecuteBfs(NetworkGraph graph, List <UInt32> srcNodeNums, bool limitedDiscovery, bool includeSibling,
RelationshipType allowedRelationships, ref List <UInt32>[] Best, ref List <UInt32>[] BestNew, ref List <UInt32>[][] BucketTable, ref List <UInt32>[] ChosenPath,
ref UInt32[] ChosenParent, ref byte[] L, ref byte[] BestRelation)
{
Destination utility = new Destination();
// Initialize some stuff...
Queue <AsNode> nodeQueue = new Queue <AsNode>(graph.NodeCount);
graph.BfsTreeNodeCount = 0;
// "Visit" the source nodes
foreach (UInt32 srcNodeNum in srcNodeNums)
{
AsNode currentNode = graph.GetNode(srcNodeNum);
currentNode.InProcessBfsStatus = NodeInProcessBfsStatus.SeenInCurrentRun;
currentNode.BfsDepth = 0;
nodeQueue.Enqueue(currentNode);
graph.BfsTreeNodeCount++;
//init the destination's path to itself
ChosenPath[srcNodeNum] = new List <UInt32>();
ChosenPath[srcNodeNum].Add(srcNodeNum);
Best[srcNodeNum] = new List <UInt32>();
Best[srcNodeNum].Add(srcNodeNum);
//if (allowedRelationships.HasFlag(RelationshipType.CustomerOf))
if ((allowedRelationships & RelationshipType.CustomerOf) == RelationshipType.CustomerOf || allowedRelationships == RelationshipType.NullRelationship)
{
BucketTable[0][Destination._CUSTOMERCOLUMN] = new List <UInt32>();
BucketTable[0][Destination._CUSTOMERCOLUMN].Add(srcNodeNum);
}
}
// While there's still nodes to be examined...
while (nodeQueue.Count > 0)
{
// Dequeue a node to examine. Iterate through all of its neighbors of the specified type (plus
// existing BFS children) and visit them.
AsNode currentNode = nodeQueue.Dequeue();
foreach (AsNode oppositeNode in currentNode.GetNeighborsByType(allowedRelationships | RelationshipType.BfsParentOf).Distinct())
{
bool addedtoBest = false;
// If this is the first time we've see this node, mark it and possibly enqueue it for later examination
if (oppositeNode.InProcessBfsStatus == NodeInProcessBfsStatus.UnseenInCurrentRun)
{
// Case 1: oppositeNode is a newly discovered node, also unseen in any previous BFS runs
if (oppositeNode.PriorBfsStatus == NodePriorBfsStatus.NotDiscoveredInPriorBfs)
{
oppositeNode.InProcessBfsStatus = NodeInProcessBfsStatus.SeenInCurrentRun;
oppositeNode.BfsDepth = currentNode.BfsDepth + 1;
oppositeNode.BfsParentNode = currentNode;
currentNode.AddBfsChild(oppositeNode);
graph.BfsTreeDepth = Math.Max(graph.BfsTreeDepth, oppositeNode.BfsDepth);
graph.BfsTreeNodeCount++;
if (!oppositeNode.isStub() || !OnlyNonStubs)
{
L[oppositeNode.NodeNum] = (byte)oppositeNode.BfsDepth;
/*** add this node to the buckettable and update its chosen path, parent and BFS depth***/
//if (allowedRelationships.HasFlag(RelationshipType.CustomerOf)) -- this is .NET 4, downgraded to make comptabilte with .NET 3.5
if ((allowedRelationships & RelationshipType.CustomerOf) == RelationshipType.CustomerOf || allowedRelationships == RelationshipType.NullRelationship)
{
//init this spot in the bucket table (if needed)
if (BucketTable[oppositeNode.BfsDepth][Destination._CUSTOMERCOLUMN] == null)
{
BucketTable[oppositeNode.BfsDepth][Destination._CUSTOMERCOLUMN] = new List <UInt32>();
}
BestRelation[oppositeNode.NodeNum] = Destination._CUSTOMERCOLUMN;
BucketTable[oppositeNode.BfsDepth][Destination._CUSTOMERCOLUMN].Add(oppositeNode.NodeNum);
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._CUSTOMERCOLUMN, ref ChosenPath);
}
//else if (allowedRelationships.HasFlag(RelationshipType.ProviderTo)) -- this is .NET 4, downgraded to make comptabilte with .NET 3.5
else if ((allowedRelationships & RelationshipType.ProviderTo) == RelationshipType.ProviderTo)
{
//init this spot in the bucket table (if needed)
if (BucketTable[oppositeNode.BfsDepth][Destination._PROVIDERCOLUMN] == null)
{
BucketTable[oppositeNode.BfsDepth][Destination._PROVIDERCOLUMN] = new List <UInt32>();
}
BestRelation[oppositeNode.NodeNum] = Destination._PROVIDERCOLUMN;
BucketTable[oppositeNode.BfsDepth][Destination._PROVIDERCOLUMN].Add(oppositeNode.NodeNum);
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._PROVIDERCOLUMN, ref ChosenPath);
}
//else if (allowedRelationships.HasFlag(RelationshipType.PeerOf)) -- this is .NET 4, downgraded to make comptabilte with .NET 3.5
else if ((allowedRelationships & RelationshipType.PeerOf) == RelationshipType.PeerOf)
{
//init this spot in the bucket table (if needed)
if (BucketTable[oppositeNode.BfsDepth][Destination._PEERCOLUMN] == null)
{
BucketTable[oppositeNode.BfsDepth][Destination._PEERCOLUMN] = new List <UInt32>();
}
BestRelation[oppositeNode.NodeNum] = Destination._PEERCOLUMN;
BucketTable[oppositeNode.BfsDepth][Destination._PEERCOLUMN].Add(oppositeNode.NodeNum);
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._PEERCOLUMN, ref ChosenPath);
}
/*** update this node's Best set ***/
if (Best[oppositeNode.NodeNum] == null)
{
Best[oppositeNode.NodeNum] = new List <UInt32>();
}
Best[oppositeNode.NodeNum].Add(currentNode.NodeNum);
ChosenParent[oppositeNode.NodeNum] = currentNode.NodeNum;
if (BestNew[oppositeNode.NodeNum] == null)
{
BestNew[oppositeNode.NodeNum] = new List <UInt32>();
}
UInt32 encoded = 0;
UInt32 NodeNumx = currentNode.NodeNum;
if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.ProviderTo)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._PROVIDERCOLUMN);
}
else if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.CustomerOf || allowedRelationships == RelationshipType.NullRelationship)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._CUSTOMERCOLUMN);
}
else if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.PeerOf)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._PEERCOLUMN);
}
BestNew[oppositeNode.NodeNum].Add(encoded);
}
// If we want to continue discovering past this newly found node, enqueue it
if (!limitedDiscovery)
{
nodeQueue.Enqueue(oppositeNode);
}
}
// Case 2: oppositeNode was found in a prior BFS run, and the path to oppositeNode went through currentNode
else if (oppositeNode.BfsParentNode == currentNode)
{
// Don't need to do any marking of the opposite node because it's already in the BFS tree.
// Just enqueue it so we can continue our BFS from that node at some later time.
oppositeNode.InProcessBfsStatus = NodeInProcessBfsStatus.SeenInCurrentRun;
nodeQueue.Enqueue(oppositeNode);
graph.BfsTreeDepth = Math.Max(graph.BfsTreeDepth, oppositeNode.BfsDepth);
graph.BfsTreeNodeCount++;
// Sanity check... the depth should be the same, right?
if (oppositeNode.BfsDepth != currentNode.BfsDepth + 1)
{
throw new Exception("Unexpected BFS depth during BFS re-run");
}
}
// Case 3: oppositeNode was found in a prior BFS run, and the path to oppositeNode did NOT go through currentNode
// No action necessary. We can't process oppositeNode now because we aren't allow to follow this edge.
// Eventually we will hit the already-existing edge that's part of a prior BFS run, and we'll enter Case 2 above.
}
// We've seen this node before...
else
{
// Did we find an alternate route to the opposite node?
// We cannot change the route if this node was found in a prior BFS run.
// This is where tie-breaking happens...
if ((oppositeNode.InProcessBfsStatus == NodeInProcessBfsStatus.SeenInCurrentRun) &&
(oppositeNode.BfsDepth == (currentNode.BfsDepth + 1)) &&
(oppositeNode.PriorBfsStatus != NodePriorBfsStatus.DiscoveredInPriorBfs))
{
// This is an alternate route... break the tie
//note that current node is a potential parent of opposite node here.
//equivalent to current node being one of the nodes in the tiebreak set
//Console.WriteLine("Ties Breaker");
//UPDATED CONDITION TO DEAL WITH HASH FLAG
if ((Hash && NewRouteWinsTieBreak(currentNode, oppositeNode, includeSibling)) || (!Hash && NewRouteWinsTieBreakOriginal(currentNode, oppositeNode, includeSibling)))
{
// Tie-break algorithm says we have a new, better route to this node.
// We need to switch the route through the current node instead.
oppositeNode.BfsParentNode.RemoveBfsChild(oppositeNode);
oppositeNode.BfsParentNode = currentNode;
currentNode.AddBfsChild(oppositeNode);
if (!oppositeNode.isStub() || !OnlyNonStubs)
{
/*** update chosen parent***/
ChosenParent[oppositeNode.NodeNum] = currentNode.NodeNum;
/*** update its chosen path ***/
//if (allowedRelationships.HasFlag(RelationshipType.CustomerOf))
if ((allowedRelationships & RelationshipType.CustomerOf) == RelationshipType.CustomerOf || allowedRelationships == RelationshipType.NullRelationship)
{
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._CUSTOMERCOLUMN, ref ChosenPath);
}
//else if (allowedRelationships.HasFlag(RelationshipType.ProviderTo))
else if ((allowedRelationships & RelationshipType.ProviderTo) == RelationshipType.ProviderTo)
{
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._PROVIDERCOLUMN, ref ChosenPath);
}
//else if (allowedRelationships.HasFlag(RelationshipType.PeerOf))
else if ((allowedRelationships & RelationshipType.PeerOf) == RelationshipType.PeerOf)
{
utility.updatePath(oppositeNode.NodeNum, ChosenPath[currentNode.NodeNum], Destination._PEERCOLUMN, ref ChosenPath);
}
}
}
/*** NEED TO UPDATE BEST SET WHETHER OR NOT THIS WINS THE TIE BREAK!! **/
if (!oppositeNode.isStub() || !OnlyNonStubs)
{
Best[oppositeNode.NodeNum].Add(currentNode.NodeNum);
addedtoBest = true;
}
}
}
if ((Best[oppositeNode.NodeNum] != null))// && addedtoBest)// &&
//(oppositeNode.PriorBfsStatus != NodePriorBfsStatus.DiscoveredInPriorBfs))
{
if (BestNew[oppositeNode.NodeNum] == null)
{
BestNew[oppositeNode.NodeNum] = new List <UInt32>();
}
UInt32 encoded = 0;
UInt32 NodeNumx = currentNode.NodeNum;
if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.ProviderTo)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._PROVIDERCOLUMN);
}
else if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.CustomerOf || allowedRelationships == RelationshipType.NullRelationship)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._CUSTOMERCOLUMN);
}
else if ((allowedRelationships & currentNode.GetRelationshipTypeOfNeighbor(oppositeNode)) == RelationshipType.PeerOf)
{
encoded = (UInt32)((NodeNumx << 3) + Destination._PEERCOLUMN);
}
UInt32 encoded0 = (UInt32)((NodeNumx << 3) + Destination._PROVIDERCOLUMN);
UInt32 encoded1 = (UInt32)((NodeNumx << 3) + Destination._CUSTOMERCOLUMN);
UInt32 encoded2 = (UInt32)((NodeNumx << 3) + Destination._PEERCOLUMN);
if (!((BestNew[oppositeNode.NodeNum].Exists(element => element == encoded0)) || (BestNew[oppositeNode.NodeNum].Exists(element => element == encoded1)) || (BestNew[oppositeNode.NodeNum].Exists(element => element == encoded2))))
{
//Console.WriteLine(oppositeNode.NodeNum + "--> Entered for: " + ((UInt32)(((uint)encoded) >> 3) + " relation: " + (int)(encoded & 7)));
//Console.WriteLine("encoded = " + encoded);
if (encoded != 0)
{
//Console.WriteLine(oppositeNode.NodeNum + "--> Entered for: " + ((UInt32)(((uint)encoded) >> 3) + " relation: " + (int)(encoded & 7)));
//if ((((allowedRelationships & RelationshipType.ProviderTo) == RelationshipType.ProviderTo) && oppositeNode.InProcessBfsStatus == NodeInProcessBfsStatus.ProcessedInCurrentRun))
//{
// Console.Write("Rel: " + allowedRelationships + " & Node status: " + oppositeNode.InProcessBfsStatus + "\n");
//}
//else
{
BestNew[oppositeNode.NodeNum].Add(encoded);
}
}
}
}
}
// Update the in-process BFS status
currentNode.InProcessBfsStatus = NodeInProcessBfsStatus.ProcessedInCurrentRun;
}
// Finished the BFS... lock the discovered nodes into the BFS tree
foreach (AsNode node in graph.GetAllNodes())
{
// FYI In limitedDiscovery mode, some nodes may have been left in the SeenInCurrentRun state
// (instead of ProcessedInCurrentRun).
if (node.InProcessBfsStatus != NodeInProcessBfsStatus.UnseenInCurrentRun)
{
node.PriorBfsStatus = NodePriorBfsStatus.DiscoveredInPriorBfs;
}
node.InProcessBfsStatus = NodeInProcessBfsStatus.UnseenInCurrentRun;
}
}
