Priyanka B | b696358 | 2016-05-20 20:21:20 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016-present 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 | package org.onosproject.pce.pceservice.constraint; |
| 17 | |
| 18 | import org.onlab.util.Bandwidth; |
| 19 | import org.onosproject.net.Link; |
| 20 | import org.onosproject.net.intent.ResourceContext; |
| 21 | import org.onosproject.net.intent.constraint.BooleanConstraint; |
| 22 | import org.onosproject.net.resource.Resources; |
| 23 | |
| 24 | import java.util.List; |
| 25 | import java.util.Objects; |
| 26 | import java.util.stream.Stream; |
| 27 | |
| 28 | import static com.google.common.base.MoreObjects.toStringHelper; |
| 29 | |
| 30 | /** |
| 31 | * Constraint that evaluates whether links satisfies sharedbandwidth request. |
| 32 | */ |
| 33 | public final class SharedBandwidthConstraint extends BooleanConstraint { |
| 34 | |
| 35 | private final List<Link> links; |
| 36 | private final Bandwidth sharedBwValue; |
| 37 | private final Bandwidth requestBwValue; |
| 38 | //temporary variable declared to hold changed bandwidth value |
| 39 | private Bandwidth changedBwValue; |
| 40 | |
| 41 | // Constructor for serialization |
| 42 | private SharedBandwidthConstraint() { |
| 43 | links = null; |
| 44 | sharedBwValue = null; |
| 45 | requestBwValue = null; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Creates a new SharedBandwidth constraint. |
| 50 | * |
| 51 | * @param links shared links |
| 52 | * @param sharedBwValue shared bandwidth of the links |
| 53 | * @param requestBwValue requested bandwidth value |
| 54 | */ |
| 55 | public SharedBandwidthConstraint(List<Link> links, Bandwidth sharedBwValue, Bandwidth requestBwValue) { |
| 56 | this.links = links; |
| 57 | this.sharedBwValue = sharedBwValue; |
| 58 | this.requestBwValue = requestBwValue; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Creates a new SharedBandwidth constraint. |
| 63 | * |
| 64 | * @param links shared links |
| 65 | * @param sharedBwValue shared bandwidth of the links |
| 66 | * @param requestBwValue requested bandwidth value |
| 67 | * @return SharedBandwidth instance |
| 68 | */ |
| 69 | public static SharedBandwidthConstraint of(List<Link> links, Bandwidth sharedBwValue, Bandwidth requestBwValue) { |
| 70 | return new SharedBandwidthConstraint(links, sharedBwValue, requestBwValue); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Obtains shared links. |
| 75 | * |
| 76 | * @return shared links |
| 77 | */ |
| 78 | public List<Link> links() { |
| 79 | return links; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Obtains shared bandwidth of the links. |
| 84 | * |
| 85 | * @return shared bandwidth |
| 86 | */ |
| 87 | public Bandwidth sharedBwValue() { |
| 88 | return sharedBwValue; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Obtains requested bandwidth value. |
| 93 | * |
| 94 | * @return requested bandwidth value |
| 95 | */ |
| 96 | public Bandwidth requestBwValue() { |
| 97 | return requestBwValue; |
| 98 | } |
| 99 | |
| 100 | @Override |
| 101 | public boolean isValid(Link link, ResourceContext context) { |
| 102 | changedBwValue = requestBwValue; |
| 103 | if (links.contains(link)) { |
| 104 | changedBwValue = requestBwValue.isGreaterThan(sharedBwValue) ? requestBwValue.subtract(sharedBwValue) |
| 105 | : Bandwidth.bps(0); |
| 106 | } |
| 107 | |
| 108 | return Stream |
| 109 | .of(link.src(), link.dst()) |
| 110 | .map(cp -> Resources.continuous(cp.deviceId(), cp.port(), Bandwidth.class).resource( |
| 111 | changedBwValue.bps())).allMatch(context::isAvailable); |
| 112 | } |
| 113 | |
| 114 | @Override |
| 115 | public int hashCode() { |
| 116 | return Objects.hash(requestBwValue, sharedBwValue, links); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public boolean equals(Object obj) { |
| 121 | if (this == obj) { |
| 122 | return true; |
| 123 | } |
| 124 | |
| 125 | if (obj instanceof SharedBandwidthConstraint) { |
| 126 | SharedBandwidthConstraint other = (SharedBandwidthConstraint) obj; |
| 127 | return Objects.equals(this.requestBwValue, other.requestBwValue) |
| 128 | && Objects.equals(this.sharedBwValue, other.sharedBwValue) |
| 129 | && Objects.equals(this.links, other.links); |
| 130 | } |
| 131 | |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | @Override |
| 136 | public String toString() { |
| 137 | return toStringHelper(this) |
| 138 | .add("requestBwValue", requestBwValue) |
| 139 | .add("sharedBwValue", sharedBwValue) |
| 140 | .add("links", links) |
| 141 | .toString(); |
| 142 | } |
| 143 | } |