2 * Copyright 2014 Open Networking Laboratory
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 package org.onosproject.net.intent.constraint;
18 import com.google.common.annotations.Beta;
19 import com.google.common.base.MoreObjects;
20 import org.onosproject.net.Link;
21 import org.onosproject.net.Path;
22 import org.onosproject.net.intent.Constraint;
23 import org.onosproject.net.resource.link.LinkResourceService;
25 import java.time.Duration;
26 import java.time.temporal.ChronoUnit;
27 import java.util.Objects;
29 import static org.onosproject.net.AnnotationKeys.LATENCY;
30 import static org.onosproject.net.AnnotationKeys.getAnnotatedValue;
33 * Constraint that evaluates the latency through a path.
36 public class LatencyConstraint implements Constraint {
38 private final Duration latency;
41 * Creates a new constraint to keep under specified latency through a path.
42 * @param latency latency to be kept
44 public LatencyConstraint(Duration latency) {
45 this.latency = latency;
48 // Constructor for serialization
49 private LatencyConstraint() {
50 this.latency = Duration.ZERO;
53 public Duration latency() {
58 public double cost(Link link, LinkResourceService resourceService) {
59 return getAnnotatedValue(link, LATENCY);
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;
69 public int hashCode() {
70 return Objects.hash(latency);
74 public boolean equals(Object obj) {
79 if (!(obj instanceof LatencyConstraint)) {
83 final LatencyConstraint that = (LatencyConstraint) obj;
84 return Objects.equals(this.latency, that.latency);
88 public String toString() {
89 return MoreObjects.toStringHelper(this)
90 .add("latency", latency)