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/*
* Copyright 2014 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 org.onlab.util.Bandwidth;
import org.onlab.util.DataRateUnit;
import org.onosproject.net.Link;
import org.onosproject.net.resource.link.BandwidthResourceRequest;
import org.onosproject.net.resource.link.LinkResourceService;
import org.onosproject.net.resource.ResourceRequest;
import org.onosproject.net.resource.ResourceType;
import java.util.Objects;
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, LinkResourceService resourceService) {
for (ResourceRequest request : resourceService.getAvailableResources(link)) {
if (request.type() == ResourceType.BANDWIDTH) {
BandwidthResourceRequest brr = (BandwidthResourceRequest) request;
if (brr.bandwidth().toDouble() >= bandwidth.bps()) {
return true;
}
}
}
return false;
}
/**
* 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();
}
}
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