| package org.onlab.onos.net.topology; |
| |
| import org.onlab.onos.event.AbstractEvent; |
| import org.onlab.onos.event.Event; |
| |
| import java.util.List; |
| |
| /** |
| * Describes network topology event. |
| */ |
| public class TopologyEvent extends AbstractEvent<TopologyEvent.Type, Topology> { |
| |
| private final List<Event> reasons; |
| |
| /** |
| * Type of topology events. |
| */ |
| public enum Type { |
| /** |
| * Signifies that topology has changed. |
| */ |
| TOPOLOGY_CHANGED |
| } |
| |
| /** |
| * Creates an event of a given type and for the specified topology and the |
| * current time. |
| * |
| * @param type topology event type |
| * @param topology event topology subject |
| * @param reasons list of events that triggered topology change |
| */ |
| public TopologyEvent(Type type, Topology topology, List<Event> reasons) { |
| super(type, topology); |
| this.reasons = reasons; |
| } |
| |
| /** |
| * Creates an event of a given type and for the specified topology and time. |
| * |
| * @param type link event type |
| * @param topology event topology subject |
| * @param reasons list of events that triggered topology change |
| * @param time occurrence time |
| */ |
| public TopologyEvent(Type type, Topology topology, List<Event> reasons, |
| long time) { |
| super(type, topology, time); |
| this.reasons = reasons; |
| } |
| |
| |
| /** |
| * Returns the list of events that triggered the topology change. |
| * |
| * @return list of events responsible for change in topology; null if |
| * initial topology computation |
| */ |
| public List<Event> reasons() { |
| return reasons; |
| } |
| |
| } |