Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 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 | */ |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 16 | package org.onosproject.net.intent.constraint; |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 17 | |
Brian O'Connor | 9476fa1 | 2015-06-25 15:17:17 -0400 | [diff] [blame] | 18 | import com.google.common.annotations.Beta; |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 19 | import com.google.common.base.MoreObjects; |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 20 | import org.onosproject.net.Link; |
| 21 | import org.onosproject.net.Path; |
| 22 | import org.onosproject.net.intent.Constraint; |
Brian O'Connor | 6de2e20 | 2015-05-21 14:30:41 -0700 | [diff] [blame] | 23 | import org.onosproject.net.resource.link.LinkResourceService; |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 24 | |
| 25 | import java.time.Duration; |
| 26 | import java.time.temporal.ChronoUnit; |
| 27 | import java.util.Objects; |
| 28 | |
Brian O'Connor | abafb50 | 2014-12-02 22:26:20 -0800 | [diff] [blame] | 29 | import static org.onosproject.net.AnnotationKeys.LATENCY; |
| 30 | import static org.onosproject.net.AnnotationKeys.getAnnotatedValue; |
Sho SHIMIZU | fe129db | 2014-11-11 14:24:51 -0800 | [diff] [blame] | 31 | |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 32 | /** |
| 33 | * Constraint that evaluates the latency through a path. |
| 34 | */ |
Brian O'Connor | 9476fa1 | 2015-06-25 15:17:17 -0400 | [diff] [blame] | 35 | @Beta |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 36 | public class LatencyConstraint implements Constraint { |
| 37 | |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 38 | private final Duration latency; |
| 39 | |
| 40 | /** |
| 41 | * Creates a new constraint to keep under specified latency through a path. |
| 42 | * @param latency latency to be kept |
| 43 | */ |
| 44 | public LatencyConstraint(Duration latency) { |
| 45 | this.latency = latency; |
| 46 | } |
| 47 | |
Sho SHIMIZU | cd4bac8 | 2014-11-11 17:07:25 -0800 | [diff] [blame] | 48 | // Constructor for serialization |
| 49 | private LatencyConstraint() { |
| 50 | this.latency = Duration.ZERO; |
| 51 | } |
| 52 | |
Sho SHIMIZU | 412a239 | 2014-11-10 18:11:48 -0800 | [diff] [blame] | 53 | public Duration latency() { |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 54 | return latency; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public double cost(Link link, LinkResourceService resourceService) { |
Sho SHIMIZU | 97a64cd | 2014-11-11 16:31:21 -0800 | [diff] [blame] | 59 | return getAnnotatedValue(link, LATENCY); |
Sho SHIMIZU | 1df945b | 2014-11-06 18:36:11 -0800 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public boolean validate(Path path, LinkResourceService resourceService) { |
| 64 | double pathLatency = path.links().stream().mapToDouble(link -> cost(link, resourceService)).sum(); |
| 65 | return Duration.of((long) pathLatency, ChronoUnit.MICROS).compareTo(latency) <= 0; |
| 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public int hashCode() { |
| 70 | return Objects.hash(latency); |
| 71 | } |
| 72 | |
| 73 | @Override |
| 74 | public boolean equals(Object obj) { |
| 75 | if (this == obj) { |
| 76 | return true; |
| 77 | } |
| 78 | |
| 79 | if (!(obj instanceof LatencyConstraint)) { |
| 80 | return false; |
| 81 | } |
| 82 | |
| 83 | final LatencyConstraint that = (LatencyConstraint) obj; |
| 84 | return Objects.equals(this.latency, that.latency); |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public String toString() { |
| 89 | return MoreObjects.toStringHelper(this) |
| 90 | .add("latency", latency) |
| 91 | .toString(); |
| 92 | } |
| 93 | } |