| /* |
| * 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.onlab.onos.net.topology; |
| |
| import org.onlab.onos.net.Provided; |
| |
| /** |
| * Represents a network topology computation snapshot. |
| */ |
| public interface Topology extends Provided { |
| |
| // FIXME: Following is not true right now. It is actually System.nanoTime(), |
| // which has no relation to epoch time, wall clock, etc. |
| /** |
| * Returns the time, specified in milliseconds since start of epoch, |
| * when the topology became active and made available. |
| * |
| * @return time in milliseconds since start of epoch |
| */ |
| long time(); |
| |
| /** |
| * Returns the number of SCCs (strongly connected components) in the |
| * topology. |
| * |
| * @return number of clusters |
| */ |
| int clusterCount(); |
| |
| /** |
| * Returns the number of infrastructure devices in the topology. |
| * |
| * @return number of devices |
| */ |
| int deviceCount(); |
| |
| |
| /** |
| * Returns the number of infrastructure links in the topology. |
| * |
| * @return number of links |
| */ |
| int linkCount(); |
| |
| /** |
| * Returns the number of infrastructure paths computed between devices |
| * in the topology. This means the number of all the shortest paths |
| * (hop-count) between all device pairs. |
| * |
| * @return number of paths |
| */ |
| int pathCount(); |
| |
| } |