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/*
* Copyright 2014-2015 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.topology;
import org.onlab.util.GeoLocation;
import org.onosproject.net.AnnotationKeys;
import org.onosproject.net.Annotations;
import org.onosproject.net.Device;
import org.onosproject.net.DeviceId;
import org.onosproject.net.device.DeviceService;
import static java.lang.Double.MAX_VALUE;
/**
* Link weight for measuring link cost using the geo distance between link
* vertices as determined by the element longitude/latitude annotation.
*/
public class GeoDistanceLinkWeight implements LinkWeight {
private static final double MAX_KM = 40_075 / 2.0;
private final DeviceService deviceService;
/**
* Creates a new link-weight with access to the specified device service.
*
* @param deviceService device service reference
*/
public GeoDistanceLinkWeight(DeviceService deviceService) {
this.deviceService = deviceService;
}
@Override
public double weight(TopologyEdge edge) {
GeoLocation src = getLocation(edge.link().src().deviceId());
GeoLocation dst = getLocation(edge.link().dst().deviceId());
return src != null && dst != null ? src.kilometersTo(dst) : MAX_KM;
}
private GeoLocation getLocation(DeviceId deviceId) {
Device d = deviceService.getDevice(deviceId);
Annotations a = d != null ? d.annotations() : null;
double latitude = getDouble(a, AnnotationKeys.LATITUDE);
double longitude = getDouble(a, AnnotationKeys.LONGITUDE);
return latitude == MAX_VALUE || longitude == MAX_VALUE ? null :
new GeoLocation(latitude, longitude);
}
private double getDouble(Annotations a, String key) {
String value = a != null ? a.value(key) : null;
try {
return value != null ? Double.parseDouble(value) : MAX_VALUE;
} catch (NumberFormatException e) {
return MAX_VALUE;
}
}
}
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