public Set<Cloudlet> allCloudletLinked(Cloudlet cloudlet) {
Set<Cloudlet> set = new HashSet<Cloudlet>();
// adds all the cloudlets in the same vertex
ApplicationVertex av = this.getVertexForCloudlet(cloudlet);
set.addAll(av.getCloudlets());
// adds the cloudlets from the connected vertex
for (ApplicationEdge ae : graph.edgesOf(av)) {
ApplicationVertex source = graph.getEdgeSource(ae);
if (source.equals(av) == false) set.addAll(source.getCloudlets());
ApplicationVertex target = graph.getEdgeTarget(ae);
if (target.equals(av) == false) set.addAll(source.getCloudlets());
}
return set;
}
public void addVertex(ApplicationVertex av) {
cloudlets.addAll(av.getCloudlets());
for (Cloudlet c : av.getCloudlets()) {
cloudletToVertex.put(c, av);
}
for (Vm vm : av.getVms()) {
vmToVertex.put(vm, av);
}
graph.addVertex(av);
}
/**
* Tests graph types: In case of invalid graph types or invalid combination of graph arguments
* UnsupportedOperationException or InvalidArgumentException is expected
*/
@Test
public void testGraphTypes() {
DirectedGraph<Integer, DefaultEdge> dg1 = new DefaultDirectedGraph<>(DefaultEdge.class);
dg1.addVertex(1);
dg1.addVertex(2);
dg1.addEdge(1, 2);
SimpleGraph<Integer, DefaultEdge> sg1 = new SimpleGraph<>(DefaultEdge.class);
sg1.addVertex(1);
sg1.addVertex(2);
sg1.addEdge(1, 2);
Multigraph<Integer, DefaultEdge> mg1 = new Multigraph<>(DefaultEdge.class);
mg1.addVertex(1);
mg1.addVertex(2);
mg1.addEdge(1, 2);
Pseudograph<Integer, DefaultEdge> pg1 = new Pseudograph<>(DefaultEdge.class);
pg1.addVertex(1);
pg1.addVertex(2);
pg1.addEdge(1, 2);
/* GT-0 test graph=null */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt0 =
new VF2SubgraphIsomorphismInspector<>(null, sg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (NullPointerException ex) {
}
/* GT-1: multigraphs */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt1 =
new VF2SubgraphIsomorphismInspector<>(mg1, mg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-2: pseudographs */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt2 =
new VF2SubgraphIsomorphismInspector<>(pg1, pg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-3: simple graphs */
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt3 =
new VF2SubgraphIsomorphismInspector<>(sg1, sg1);
assertEquals(true, gt3.getMappings().hasNext());
/* GT-4: directed graphs */
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt4 =
new VF2SubgraphIsomorphismInspector<>(dg1, dg1);
assertEquals("[1=1 2=2]", gt4.getMappings().next().toString());
/* GT-5: simple graph + multigraph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt5 =
new VF2SubgraphIsomorphismInspector<>(sg1, mg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-6: simple graph + pseudograph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt6 =
new VF2SubgraphIsomorphismInspector<>(sg1, pg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-7: directed graph + multigraph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt7 =
new VF2SubgraphIsomorphismInspector<>(dg1, mg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-8: directed graph + pseudograph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt8 =
new VF2SubgraphIsomorphismInspector<>(dg1, pg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-9: pseudograph + multigraph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt9 =
new VF2SubgraphIsomorphismInspector<>(pg1, mg1);
Assert.fail("Expected UnsupportedOperationException");
} catch (UnsupportedOperationException ex) {
}
/* GT-10: simple graph + directed graph */
try {
@SuppressWarnings("unused")
VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt10 =
new VF2SubgraphIsomorphismInspector<>(sg1, dg1);
Assert.fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException ex) {
}
}
// Calculate the contribution of current vertex's shortest-path graph to final edge betweenness
// (Newman algorithm)
// M. E. J. Newman and M. Girvan, Finding and evaluating community structure in networks, Physical
// Review E69, 026113 (2004)
private SimpleWeightedGraph<String, DefaultWeightedEdge> NewmanAlgorithm(
Multigraph<String, DefaultEdge> shortestPathGraph, String thisVertex) {
if (shortestPathGraph.edgeSet().size() == 0) // No outer degree
return null;
// 1. Initialize the edge betweenness digraph
SimpleWeightedGraph<String, DefaultWeightedEdge> edgeBetweennessDigraph =
new SimpleWeightedGraph<String, DefaultWeightedEdge>(DefaultWeightedEdge.class);
// Add vertices
for (String curVertex : shortestPathGraph.vertexSet())
edgeBetweennessDigraph.addVertex(curVertex);
// 2. Deal with corresponding edges
// 2.1. Calculate vertex distance and weight
// 2.1.1. Initialize related variables
HashMap<String, Integer> mapVertexDistance = new HashMap<String, Integer>(); // Vertex distance
for (String curVertex : shortestPathGraph.vertexSet()) mapVertexDistance.put(curVertex, 0);
HashMap<String, Double> mapVertexWeight = new HashMap<String, Double>(); // Vertex weight
for (String curVertex : shortestPathGraph.vertexSet()) mapVertexWeight.put(curVertex, 1.0);
Queue<String> verticesQueue = new LinkedList<String>(); // Store the queue of operated vertices
// 2.1.2. Traverse the shortest-path digraph, get corresponding vertex distance and weight
verticesQueue.add(thisVertex);
String currentVertex = thisVertex;
while (!verticesQueue.isEmpty()) {
// 2.1.2.1. Read the bottom vertex in the queue, deal with all adjacent edges
for (DefaultEdge curEdge : shortestPathGraph.edgesOf(currentVertex)) {
String targetVertex = shortestPathGraph.getEdgeTarget(curEdge);
if (mapVertexDistance.get(targetVertex)
== 0) { // Target vertex value hasn't been evaluated yet
mapVertexDistance.put(targetVertex, mapVertexDistance.get(currentVertex) + 1);
mapVertexWeight.put(targetVertex, mapVertexWeight.get(currentVertex));
verticesQueue.add(targetVertex);
}
// Target vertex value has already been set to source vertex distance plus 1
else if (mapVertexDistance.get(targetVertex) == (mapVertexDistance.get(currentVertex) + 1))
mapVertexWeight.put(
targetVertex, mapVertexWeight.get(targetVertex) + mapVertexWeight.get(currentVertex));
}
// 2.1.2.2. All adjacent edges have been treated, remove the bottom element
verticesQueue.remove();
currentVertex = verticesQueue.peek();
}
// 2.2. Calculate the contribution of every edges to the edge betweenness
// 2.2.1. Sort the vertices descendingly by the distance to the first vertex
List<Map.Entry<String, Integer>> listVertexDistance =
new ArrayList<Map.Entry<String, Integer>>(mapVertexDistance.entrySet());
Collections.sort(
listVertexDistance,
new Comparator<Map.Entry<String, Integer>>() { // Sorting the list descendingly
@Override
public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) {
return (o2.getValue().compareTo(o1.getValue()));
}
});
// 2.2.2. Traverse the shortest-path digraph with the sorted vertices list
for (Map.Entry<String, Integer> thisVertexDistance : listVertexDistance) {
currentVertex = thisVertexDistance.getKey();
for (DefaultEdge curEdge : shortestPathGraph.edgesOf(currentVertex)) {
// 2.2.2.1. Get the source vertex
String sourceVertex = shortestPathGraph.getEdgeSource(curEdge);
String targetVertex = shortestPathGraph.getEdgeTarget(curEdge);
String anotherVertex = "";
if (currentVertex.equals(sourceVertex)) anotherVertex = targetVertex;
else if (currentVertex.equals(targetVertex)) anotherVertex = sourceVertex;
// 2.2.2.2. Calculate the value of the sum of all adjacent edges plus 1
double totalSubWeights = 1.0;
for (DefaultWeightedEdge curSubEdge : edgeBetweennessDigraph.edgesOf(currentVertex))
totalSubWeights += edgeBetweennessDigraph.getEdgeWeight(curSubEdge);
// 2.2.2.3. The new edge weight is calculated as totalSubWeights * (the quotient of the
// weights of the two terminals)
double wi = mapVertexWeight.get(anotherVertex);
double wj = mapVertexWeight.get(currentVertex);
totalSubWeights /= wi / wj;
// 2.2.2.4. Add new edge with correct weight into the edge betweenness digraph
DefaultWeightedEdge newEdge = new DefaultWeightedEdge();
edgeBetweennessDigraph.addEdge(anotherVertex, currentVertex, newEdge);
edgeBetweennessDigraph.setEdgeWeight(newEdge, totalSubWeights);
}
}
return edgeBetweennessDigraph;
}
// Create shortest-path graph for every vertex by depth-first traversal algorithm
private Multigraph<String, DefaultEdge> DijkstraAlgorithm(
WeightedMultigraph<String, DefaultWeightedEdge> originalGraph, String thisVertex) {
// 1. Simplify the multi-graph of the active power flow into a simple graph
SimpleWeightedGraph<String, DefaultWeightedEdge> originalSimpleGraph =
new SimpleWeightedGraph<String, DefaultWeightedEdge>(DefaultWeightedEdge.class);
for (String curVertex : originalGraph.vertexSet()) originalSimpleGraph.addVertex(curVertex);
for (DefaultWeightedEdge curEdge : originalGraph.edgeSet()) {
String sourceVertex = originalGraph.getEdgeSource(curEdge);
String targetVertex = originalGraph.getEdgeTarget(curEdge);
if (originalSimpleGraph.containsEdge(sourceVertex, targetVertex)) {
DefaultWeightedEdge modifiedEdge = originalSimpleGraph.getEdge(sourceVertex, targetVertex);
double newEdgeWeight =
originalSimpleGraph.getEdgeWeight(modifiedEdge) + originalGraph.getEdgeWeight(curEdge);
originalSimpleGraph.setEdgeWeight(modifiedEdge, newEdgeWeight);
} else {
DefaultWeightedEdge newEdge = new DefaultWeightedEdge();
originalSimpleGraph.addEdge(sourceVertex, targetVertex, newEdge);
originalSimpleGraph.setEdgeWeight(newEdge, originalGraph.getEdgeWeight(curEdge));
}
}
// Issue (2010/10/25): Maybe larger amount of active power transfer still means weaker
// relationship between the two terminal buses of a certain branch,
// thus originalSimpleGraph other than inverseGraph should be used here.
// Use the inverse of active power to build a new weighted directed graph (the larger the active
// power is, the close the two buses will be)
// SimpleDirectedWeightedGraph<String, DefaultWeightedEdge> inverseGraph =
// new SimpleDirectedWeightedGraph<String, DefaultWeightedEdge>(DefaultWeightedEdge.class);
// for (String curVertex : originalSimpleGraph.vertexSet())
// inverseGraph.addVertex(curVertex);
// for (DefaultWeightedEdge curEdge : originalSimpleGraph.edgeSet()) {
// String sourceVertex = originalSimpleGraph.getEdgeSource(curEdge);
// String targetVertex = originalSimpleGraph.getEdgeTarget(curEdge);
// DefaultWeightedEdge newEdge = new DefaultWeightedEdge();
// inverseGraph.addEdge(sourceVertex, targetVertex, newEdge);
// inverseGraph.setEdgeWeight(newEdge, 1 / originalSimpleGraph.getEdgeWeight(curEdge));
// }
// 2. Initialize the map of vertices and the corresponding weights (distance from current vertex
// to the first vertex)
HashMap<String, Double> mapVertexShortestDistance = new HashMap<String, Double>();
// for (String thisOriginalVertex : inverseGraph.vertexSet())
for (String thisOriginalVertex : originalSimpleGraph.vertexSet())
mapVertexShortestDistance.put(thisOriginalVertex, 10E10);
// The weight of the first vertex is zero
mapVertexShortestDistance.put(thisVertex, 0.0);
// 3. Depth-first traversing, update the shortest-path values
Stack<String> bfiVertices =
new Stack<String>(); // Stack to store passed vertices in a breadth-first traversing
// The map of a weighted edge and the flag of having been visited
// HashMap<DefaultWeightedEdge, Boolean> mapEdgeVisited = new HashMap<DefaultWeightedEdge,
// Boolean>();
// for (DefaultWeightedEdge thisEdge : inverseGraph.edgeSet())
// mapEdgeVisited.put(thisEdge, false);
String currentVertex = thisVertex;
bfiVertices.push(currentVertex);
// System.out.println(bfiVertices.toString());
while (!bfiVertices.isEmpty()) {
// Operate the following codes for those edges started with current vertex
boolean hasNewEdge = false;
// for (DefaultWeightedEdge curEdge : inverseGraph.outgoingEdgesOf(currentVertex)) {
for (DefaultWeightedEdge curEdge : originalSimpleGraph.edgesOf(currentVertex)) {
// if (!mapEdgeVisited.get(curEdge)) { // Used for those edges that have not been treated
// yet
// 3.1. Mark current edge as already been visited
// mapEdgeVisited.put(curEdge, true);
// String nextVertex = inverseGraph.getEdgeTarget(curEdge);
String nextVertex = originalSimpleGraph.getEdgeTarget(curEdge);
// 3.2. Update shortest-path values
double curSD = mapVertexShortestDistance.get(currentVertex);
// double edgeWeight = inverseGraph.getEdgeWeight(curEdge);
double edgeWeight = originalSimpleGraph.getEdgeWeight(curEdge);
double newSD = curSD + edgeWeight;
if (mapVertexShortestDistance.get(nextVertex) > newSD) {
hasNewEdge = true;
mapVertexShortestDistance.put(nextVertex, newSD);
// 3.3. Push the target vertex of current edge into the stack
bfiVertices.push(nextVertex);
// System.out.println(bfiVertices.toString());
break;
// System.out.println("New shortest path [" + nextVertex + "]: " + newSD);
}
// }
}
if (!hasNewEdge) {
bfiVertices.pop();
}
if (!bfiVertices.isEmpty()) currentVertex = bfiVertices.peek();
}
// 4. Create shortest-path digraph of current vertex
// 4.1. Initialize the shortest-path digraph
Multigraph<String, DefaultEdge> shortestPathGraph =
new Multigraph<String, DefaultEdge>(DefaultEdge.class);
// 4.2. Add all qualified edges
// for (DefaultWeightedEdge curEdge : inverseGraph.edgeSet()) {
for (DefaultWeightedEdge curEdge : originalSimpleGraph.edgeSet()) {
// 4.2.1. Evaluate if current edge is suitable
// String sourceVertex = inverseGraph.getEdgeSource(curEdge);
// String targetVertex = inverseGraph.getEdgeTarget(curEdge);
String sourceVertex = originalSimpleGraph.getEdgeSource(curEdge);
String targetVertex = originalSimpleGraph.getEdgeTarget(curEdge);
// if (Math.abs(inverseGraph.getEdgeWeight(curEdge) -
if (originalSimpleGraph.getEdgeWeight(curEdge) > 1.0E-5) {
if (Math.abs(
originalSimpleGraph.getEdgeWeight(curEdge)
- (mapVertexShortestDistance.get(targetVertex)
- mapVertexShortestDistance.get(sourceVertex)))
< 1.0E-5) {
// 4.2.2. Add suitable edge that found just now
DefaultEdge newEdge = new DefaultEdge();
if (!shortestPathGraph.containsVertex(sourceVertex))
shortestPathGraph.addVertex(sourceVertex);
if (!shortestPathGraph.containsVertex(targetVertex))
shortestPathGraph.addVertex(targetVertex);
shortestPathGraph.addEdge(sourceVertex, targetVertex, newEdge);
}
}
}
return shortestPathGraph;
}
public Set<ApplicationVertex> vertexSet() {
return graph.vertexSet();
}
public ApplicationEdge edgeBetween(ApplicationVertex av1, ApplicationVertex av2) {
return graph.getEdge(av1, av2);
}
public Set<ApplicationEdge> edgesOf(ApplicationVertex av1) {
return graph.edgesOf(av1);
}
public void addEdge(ApplicationEdge ed, ApplicationVertex av1, ApplicationVertex av2) {
graph.addEdge(av1, av2, ed);
}