| /* |
| * Copyright 2014-present 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.onosproject.net.intent.constraint; |
| |
| import com.google.common.annotations.Beta; |
| import com.google.common.base.MoreObjects; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.Path; |
| import org.onosproject.net.intent.Constraint; |
| import org.onosproject.net.intent.ResourceContext; |
| |
| import java.time.Duration; |
| import java.time.temporal.ChronoUnit; |
| import java.util.Objects; |
| |
| import static org.onosproject.net.AnnotationKeys.LATENCY; |
| import static org.onosproject.net.AnnotationKeys.getAnnotatedValue; |
| |
| /** |
| * Constraint that evaluates the latency through a path. |
| */ |
| @Beta |
| public class LatencyConstraint implements Constraint { |
| |
| private final Duration latency; |
| |
| /** |
| * Creates a new constraint to keep under specified latency through a path. |
| * @param latency latency to be kept |
| */ |
| public LatencyConstraint(Duration latency) { |
| this.latency = latency; |
| } |
| |
| // Constructor for serialization |
| private LatencyConstraint() { |
| this.latency = Duration.ZERO; |
| } |
| |
| public Duration latency() { |
| return latency; |
| } |
| |
| // doesn't use LinkResourceService |
| @Override |
| public double cost(Link link, ResourceContext context) { |
| // explicitly call a method not depending on LinkResourceService |
| return cost(link); |
| } |
| |
| private double cost(Link link) { |
| return getAnnotatedValue(link, LATENCY); |
| } |
| |
| // doesn't use LinkResourceService |
| @Override |
| public boolean validate(Path path, ResourceContext context) { |
| // explicitly call a method not depending on LinkResourceService |
| return validate(path); |
| } |
| |
| private boolean validate(Path path) { |
| double pathLatency = path.links().stream().mapToDouble(this::cost).sum(); |
| return Duration.of((long) pathLatency, ChronoUnit.MICROS).compareTo(latency) <= 0; |
| } |
| |
| @Override |
| public int hashCode() { |
| return latency.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| |
| if (!(obj instanceof LatencyConstraint)) { |
| return false; |
| } |
| |
| final LatencyConstraint that = (LatencyConstraint) obj; |
| return Objects.equals(this.latency, that.latency); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(this) |
| .add("latency", latency) |
| .toString(); |
| } |
| } |