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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.topology;
import org.onosproject.event.AbstractEvent;
import org.onosproject.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;
}
}
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