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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.host;
import org.joda.time.LocalDateTime;
import org.onosproject.event.AbstractEvent;
import org.onosproject.net.Host;
import static com.google.common.base.MoreObjects.toStringHelper;
/**
* Describes end-station host event.
*/
public class HostEvent extends AbstractEvent<HostEvent.Type, Host> {
/**
* Type of host events.
*/
public enum Type {
/**
* Signifies that a new host has been detected.
*/
HOST_ADDED,
/**
* Signifies that a host has been removed.
*/
HOST_REMOVED,
/**
* Signifies that host data changed, e.g. IP address
*/
HOST_UPDATED,
/**
* Signifies that a host location has changed.
*/
HOST_MOVED
}
private Host prevSubject;
/**
* Creates an event of a given type and for the specified host and the
* current time.
*
* @param type host event type
* @param host event host subject
*/
public HostEvent(Type type, Host host) {
super(type, host);
}
/**
* Creates an event of a given type and for the specified host and time.
*
* @param type host event type
* @param host event host subject
* @param time occurrence time
*/
public HostEvent(Type type, Host host, long time) {
super(type, host, time);
}
/**
* Creates an event with previous subject.
*
* The previous subject is ignored if the type is not moved or updated
*
* @param type host event type
* @param host event host subject
* @param prevSubject previous host subject
*/
public HostEvent(Type type, Host host, Host prevSubject) {
super(type, host);
if (type == Type.HOST_MOVED || type == Type.HOST_UPDATED) {
this.prevSubject = prevSubject;
}
}
/**
* Gets the previous subject in this host event.
*
* @return the previous subject, or null if previous subject is not
* specified.
*/
public Host prevSubject() {
return this.prevSubject;
}
@Override
public String toString() {
return toStringHelper(this)
.add("time", new LocalDateTime(time()))
.add("type", type())
.add("subject", subject())
.add("prevSubject", prevSubject())
.toString();
}
}
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