| /* |
| * Copyright 2015-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.topology; |
| |
| import org.onlab.graph.ScalarWeight; |
| import org.onlab.graph.Weight; |
| 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 LinkWeigher { |
| |
| 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 Weight getInitialWeight() { |
| return ScalarWeight.toWeight(0.0); |
| } |
| |
| @Override |
| public Weight getNonViableWeight() { |
| return ScalarWeight.NON_VIABLE_WEIGHT; |
| } |
| |
| @Override |
| public Weight weight(TopologyEdge edge) { |
| GeoLocation src = getLocation(edge.link().src().deviceId()); |
| GeoLocation dst = getLocation(edge.link().dst().deviceId()); |
| return ScalarWeight.toWeight(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; |
| } |
| } |
| } |
| |