| /* |
| * Copyright 2014-present Open Networking Foundation |
| * |
| * 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 org.onlab.util.Bandwidth; |
| import org.onlab.util.DataRateUnit; |
| import org.onosproject.net.DeviceId; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.intent.ResourceContext; |
| import org.onosproject.net.resource.Resources; |
| |
| import java.util.Objects; |
| import java.util.stream.Stream; |
| |
| import static com.google.common.base.MoreObjects.toStringHelper; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Constraint that evaluates links based on available bandwidths. |
| */ |
| @Beta |
| public final class BandwidthConstraint extends BooleanConstraint { |
| |
| private final Bandwidth bandwidth; |
| |
| /** |
| * Creates a new bandwidth constraint. |
| * |
| * @param bandwidth required bandwidth |
| */ |
| public BandwidthConstraint(Bandwidth bandwidth) { |
| this.bandwidth = checkNotNull(bandwidth, "Bandwidth cannot be null"); |
| } |
| |
| /** |
| * Creates a new bandwidth constraint. |
| * |
| * @param v required amount of bandwidth |
| * @param unit {@link DataRateUnit} of {@code v} |
| * @return {@link BandwidthConstraint} instance with given bandwidth requirement |
| */ |
| public static BandwidthConstraint of(double v, DataRateUnit unit) { |
| return new BandwidthConstraint(Bandwidth.of(v, unit)); |
| } |
| |
| // Constructor for serialization |
| private BandwidthConstraint() { |
| this.bandwidth = null; |
| } |
| |
| @Override |
| public boolean isValid(Link link, ResourceContext context) { |
| return Stream.of(link.src(), link.dst()) |
| .filter(cp -> cp.elementId() instanceof DeviceId) |
| .map(cp -> Resources.continuous(cp.deviceId(), cp.port(), Bandwidth.class).resource(bandwidth.bps())) |
| .allMatch(context::isAvailable); |
| } |
| |
| /** |
| * Returns the bandwidth required by this constraint. |
| * |
| * @return required bandwidth |
| */ |
| public Bandwidth bandwidth() { |
| return bandwidth; |
| } |
| |
| @Override |
| public int hashCode() { |
| return bandwidth.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| final BandwidthConstraint other = (BandwidthConstraint) obj; |
| return Objects.equals(this.bandwidth, other.bandwidth); |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(this).add("bandwidth", bandwidth).toString(); |
| } |
| } |