/**
* Generate the topological ordering for the given jobGraph.
*
* @param jobgraph the job graph
* @return a {@link List} of the {@link IndigoJob} in topological order
* @throws IllegalArgumentException if the graph has cycles (hence no topological order exists).
*/
protected List<IndigoJob> getJobsTopologicalOrder(Map<String, IndigoJob> jobgraph) {
DefaultDirectedGraph<IndigoJob, DefaultEdge> graph =
new DefaultDirectedGraph<IndigoJob, DefaultEdge>(DefaultEdge.class);
for (IndigoJob job : jobgraph.values()) {
graph.addVertex(job);
}
for (IndigoJob job : jobgraph.values()) {
for (IndigoJob parent : job.getParents()) {
graph.addEdge(parent, job); // job depends on parent
}
}
LOG.debug("IndigoJob graph: {}", graph.toString());
// Are there cycles in the dependencies.
CycleDetector<IndigoJob, DefaultEdge> cycleDetector =
new CycleDetector<IndigoJob, DefaultEdge>(graph);
if (cycleDetector.detectCycles()) {
LOG.error("Job graph has cycles!");
throw new IllegalArgumentException(
String.format(
"Failed to generate topological order for a graph with cycles: <%s>", graph));
}
TopologicalOrderIterator<IndigoJob, DefaultEdge> orderIterator =
new TopologicalOrderIterator<IndigoJob, DefaultEdge>(graph);
List<IndigoJob> topoOrder = Lists.newArrayList(orderIterator);
LOG.debug("IndigoJob topological order: {}", topoOrder);
return topoOrder;
}
public TsGraph(ArrayList<tsNode> nodes) {
rawGraph = new DefaultDirectedGraph<tsNode, DefaultEdge>(DefaultEdge.class);
// TODOo make sure number of nodes is high enough
// TODO is there an upper limit?
for (int i = 0; i < nodes.size(); i++) {
rawGraph.addVertex(nodes.get(i));
}
// First generation nodes
for (int i = 1; i < nodes.size(); i++) {
rawGraph.addEdge(nodes.get(0), nodes.get(i));
}
// Brute force connect all non zero nodes to each other
for (int i = 1; i < nodes.size(); i++) {
for (int j = 1; j < nodes.size(); j++) {
if (i != j) {
// TODO make this a weighted edge based on distance matrix
rawGraph.addEdge(nodes.get(i), nodes.get(j));
}
}
}
}
/** Rigourous Test :-) */
public void testBFS() {
DefaultDirectedGraph<Vertex, Double> graph =
new DefaultDirectedGraph<Vertex, Double>(Double.class);
Vertex v = null;
for (int i = 0; i < this.numOfVertices; i++) {
v = new Vertex("v" + i);
graph.addVertex(v);
}
// use last vertex as start point of search
Vertex lastVertex = v;
Set<Vertex> vertices = graph.vertexSet();
// add edges to graph
Random rand = new Random();
Double nextEdge = 0.0;
for (Vertex start : vertices)
for (Vertex end : vertices)
if (!start.equals(end) && !graph.containsEdge(start, end)) {
nextEdge = rand.nextDouble();
if (nextEdge > 0.9) graph.addEdge(start, end, nextEdge);
}
System.out.println("Vertices: " + vertices.size());
System.out.println("Edges: " + graph.edgeSet().size());
BreadthFirstIterator<Vertex, Double> bfsIter =
new BreadthFirstIterator<Vertex, Double>(graph, lastVertex);
BFS<Double> bfs = new BFS<Double>(graph);
Vertex[] bfsResult = bfs.breadthFirstTree(lastVertex);
for (int i = 0; i < this.numOfVertices && bfsIter.hasNext(); i++) {
System.out.println(bfsResult[i] + " " + bfsIter.next());
}
}
@Test
public void testAutomorphism() {
/*
* v1-----v2
* \ /
* \ /
* v3
*/
SimpleGraph<String, DefaultEdge> g1 = new SimpleGraph<String, DefaultEdge>(DefaultEdge.class);
String v1 = "v1", v2 = "v2", v3 = "v3";
g1.addVertex(v1);
g1.addVertex(v2);
g1.addVertex(v3);
g1.addEdge(v1, v2);
g1.addEdge(v2, v3);
g1.addEdge(v3, v1);
VF2GraphIsomorphismInspector<String, DefaultEdge> vf2 =
new VF2GraphIsomorphismInspector<String, DefaultEdge>(g1, g1);
Iterator<GraphMapping<String, DefaultEdge>> iter = vf2.getMappings();
Set<String> mappings =
new HashSet<String>(
Arrays.asList(
"[v1=v1 v2=v2 v3=v3]",
"[v1=v1 v2=v3 v3=v2]",
"[v1=v2 v2=v1 v3=v3]",
"[v1=v2 v2=v3 v3=v1]",
"[v1=v3 v2=v1 v3=v2]",
"[v1=v3 v2=v2 v3=v1]"));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(true, mappings.remove(iter.next().toString()));
assertEquals(false, iter.hasNext());
/*
* 1 ---> 2 <--- 3
*/
DefaultDirectedGraph<Integer, DefaultEdge> g2 =
new DefaultDirectedGraph<Integer, DefaultEdge>(DefaultEdge.class);
g2.addVertex(1);
g2.addVertex(2);
g2.addVertex(3);
g2.addEdge(1, 2);
g2.addEdge(3, 2);
VF2GraphIsomorphismInspector<Integer, DefaultEdge> vf3 =
new VF2GraphIsomorphismInspector<Integer, DefaultEdge>(g2, g2);
Iterator<GraphMapping<Integer, DefaultEdge>> iter2 = vf3.getMappings();
Set<String> mappings2 = new HashSet<String>(Arrays.asList("[1=1 2=2 3=3]", "[1=3 2=2 3=1]"));
assertEquals(true, mappings2.remove(iter2.next().toString()));
assertEquals(true, mappings2.remove(iter2.next().toString()));
assertEquals(false, iter2.hasNext());
}