Nikhil Cheerla | 1cf0f9a | 2015-07-09 12:26:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.net; |
| 18 | |
| 19 | import org.onosproject.net.provider.ProviderId; |
| 20 | |
| 21 | import java.util.List; |
| 22 | import java.util.Objects; |
| 23 | import static com.google.common.collect.ImmutableSet.of; |
| 24 | |
| 25 | /** |
| 26 | * Default implementation of a network disjoint path pair. |
| 27 | */ |
| 28 | public class DefaultDisjointPath extends DefaultPath implements DisjointPath { |
| 29 | |
| 30 | private final DefaultPath path1; |
| 31 | private final DefaultPath path2; |
| 32 | |
| 33 | boolean usingPath1 = true; |
| 34 | |
| 35 | /** |
| 36 | * Creates a disjoint path pair from two default paths. |
| 37 | * |
| 38 | * @param providerId provider identity |
| 39 | * @param path1 primary path |
| 40 | * @param path2 backup path |
| 41 | */ |
| 42 | public DefaultDisjointPath(ProviderId providerId, DefaultPath path1, DefaultPath path2) { |
| 43 | super(providerId, path1.links(), path1.cost() + path2.cost()); |
| 44 | this.path1 = path1; |
| 45 | this.path2 = path2; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public List<Link> links() { |
| 50 | if (usingPath1) { |
| 51 | return path1.links(); |
| 52 | } else { |
| 53 | return path2.links(); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public double cost() { |
| 59 | if (usingPath1) { |
| 60 | return path1.cost(); |
| 61 | } |
| 62 | return path2.cost(); |
| 63 | } |
| 64 | |
| 65 | @Override |
| 66 | public Path primary() { |
| 67 | return path1; |
| 68 | } |
| 69 | |
| 70 | @Override |
| 71 | public Path backup() { |
| 72 | return path2; |
| 73 | } |
| 74 | |
| 75 | @Override |
| 76 | public int hashCode() { |
| 77 | return Objects.hash(of(path1, path2), src(), dst()); |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public boolean equals(Object obj) { |
| 82 | if (this == obj) { |
| 83 | return true; |
| 84 | } |
| 85 | if (obj instanceof DefaultDisjointPath) { |
| 86 | final DefaultDisjointPath other = (DefaultDisjointPath) obj; |
| 87 | return Objects.equals(this.path1, other.path1) && Objects.equals(this.path2, other.path2); |
| 88 | } |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public boolean useBackup() { |
| 94 | if (path2 == null || path2.links() == null) { |
| 95 | return false; |
| 96 | } |
| 97 | usingPath1 = !usingPath1; |
| 98 | return true; |
| 99 | } |
| 100 | } |