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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onlab.graph;
import org.junit.Test;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import static com.google.common.collect.ImmutableSet.of;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.onlab.graph.GraphPathSearch.ALL_PATHS;
/**
* Test of the Suurballe backup path algorithm.
*/
public class SrlgGraphSearchTest extends BreadthFirstSearchTest {
@Override
protected AbstractGraphPathSearch<TestVertex, TestEdge> graphSearch() {
return new SrlgGraphSearch<>(null);
}
public void setDefaultWeights() {
weight = null;
}
@Override
public void defaultGraphTest() {
}
@Override
public void defaultHopCountWeight() {
}
@Test
public void onePathPair() {
setDefaultWeights();
TestEdge aB = new TestEdge(A, B, 1);
TestEdge bC = new TestEdge(B, C, 1);
TestEdge aD = new TestEdge(A, D, 1);
TestEdge dC = new TestEdge(D, C, 1);
Graph<TestVertex, TestEdge> graph = new AdjacencyListsGraph<>(of(A, B, C, D),
of(aB, bC, aD, dC));
Map<TestEdge, Integer> riskProfile = new HashMap<>();
riskProfile.put(aB, 0);
riskProfile.put(bC, 0);
riskProfile.put(aD, 1);
riskProfile.put(dC, 1);
SrlgGraphSearch<TestVertex, TestEdge> search = new SrlgGraphSearch<>(2, riskProfile);
Set<Path<TestVertex, TestEdge>> paths = search.search(graph, A, C, weight, ALL_PATHS).paths();
System.out.println("\n\n\n" + paths + "\n\n\n");
assertEquals("one disjoint path pair found", 1, paths.size());
checkIsDisjoint(paths.iterator().next(), riskProfile);
}
public void checkIsDisjoint(Path<TestVertex, TestEdge> p, Map<TestEdge, Integer> risks) {
assertTrue("The path is not a DisjointPathPair", (p instanceof DisjointPathPair));
DisjointPathPair<TestVertex, TestEdge> q = (DisjointPathPair) p;
Set<Integer> p1Risks = new HashSet<>();
for (TestEdge e : q.edges()) {
p1Risks.add(risks.get(e));
}
if (!q.hasBackup()) {
return;
}
Path<TestVertex, TestEdge> pq = q.secondary();
for (TestEdge e: pq.edges()) {
assertTrue("The paths are not disjoint", !p1Risks.contains(risks.get(e)));
}
}
@Test
public void complexGraphTest() {
setDefaultWeights();
TestEdge aB = new TestEdge(A, B, 1);
TestEdge bC = new TestEdge(B, C, 1);
TestEdge aD = new TestEdge(A, D, 1);
TestEdge dC = new TestEdge(D, C, 1);
TestEdge cE = new TestEdge(C, E, 1);
TestEdge bE = new TestEdge(B, E, 1);
Graph<TestVertex, TestEdge> graph = new AdjacencyListsGraph<>(of(A, B, C, D, E),
of(aB, bC, aD, dC, cE, bE));
Map<TestEdge, Integer> riskProfile = new HashMap<>();
riskProfile.put(aB, 0);
riskProfile.put(bC, 0);
riskProfile.put(aD, 1);
riskProfile.put(dC, 1);
riskProfile.put(cE, 2);
riskProfile.put(bE, 3);
SrlgGraphSearch<TestVertex, TestEdge> search = new SrlgGraphSearch<>(4, riskProfile);
search.search(graph, A, E, weight, ALL_PATHS).paths();
}
@Test
public void multiplePathGraphTest() {
setDefaultWeights();
TestEdge aB = new TestEdge(A, B, 1);
TestEdge bE = new TestEdge(B, E, 1);
TestEdge aD = new TestEdge(A, D, 1);
TestEdge dE = new TestEdge(D, E, 1);
TestEdge aC = new TestEdge(A, C, 1);
TestEdge cE = new TestEdge(C, E, 1);
Graph<TestVertex, TestEdge> graph = new AdjacencyListsGraph<>(of(A, B, C, D, E),
of(aB, bE, aD, dE, aC, cE));
Map<TestEdge, Integer> riskProfile = new HashMap<>();
riskProfile.put(aB, 0);
riskProfile.put(bE, 1);
riskProfile.put(aD, 2);
riskProfile.put(dE, 3);
riskProfile.put(aC, 4);
riskProfile.put(cE, 5);
SrlgGraphSearch<TestVertex, TestEdge> search = new SrlgGraphSearch<>(6, riskProfile);
Set<Path<TestVertex, TestEdge>> paths = search.search(graph, A, E, weight, ALL_PATHS).paths();
assertTrue("> one disjoint path pair found", paths.size() >= 1);
checkIsDisjoint(paths.iterator().next(), riskProfile);
}
@Test
public void onePath() {
setDefaultWeights();
TestEdge aB = new TestEdge(A, B, 1);
TestEdge bC = new TestEdge(B, C, 1);
TestEdge aD = new TestEdge(A, D, 1);
TestEdge dC = new TestEdge(D, C, 1);
Graph<TestVertex, TestEdge> graph = new AdjacencyListsGraph<>(of(A, B, C, D),
of(aB, bC, aD, dC));
Map<TestEdge, Integer> riskProfile = new HashMap<>();
riskProfile.put(aB, 0);
riskProfile.put(bC, 0);
riskProfile.put(aD, 1);
riskProfile.put(dC, 0);
SrlgGraphSearch<TestVertex, TestEdge> search = new SrlgGraphSearch<>(2, riskProfile);
Set<Path<TestVertex, TestEdge>> paths = search.search(graph, A, C, weight, ALL_PATHS).paths();
System.out.println(paths);
assertTrue("no disjoint path pairs found", paths.size() == 0);
}
@Test
public void noPath() {
setDefaultWeights();
TestEdge aB = new TestEdge(A, B, 1);
TestEdge bC = new TestEdge(B, C, 1);
TestEdge aD = new TestEdge(A, D, 1);
TestEdge dC = new TestEdge(D, C, 1);
Graph<TestVertex, TestEdge> graph = new AdjacencyListsGraph<>(of(A, B, C, D, E),
of(aB, bC, aD, dC));
Map<TestEdge, Integer> riskProfile = new HashMap<>();
riskProfile.put(aB, 0);
riskProfile.put(bC, 0);
riskProfile.put(aD, 1);
riskProfile.put(dC, 0);
SrlgGraphSearch<TestVertex, TestEdge> search = new SrlgGraphSearch<>(2, riskProfile);
Set<Path<TestVertex, TestEdge>> paths = search.search(graph, A, E, weight, ALL_PATHS).paths();
assertTrue("no disjoint path pairs found", paths.size() == 0);
}
}
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