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/*
* Copyright 2014-2015 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.event;
/**
* Abstraction of an of a time-stamped event pertaining to an arbitrary subject.
*/
public interface Event<T extends Enum, S> {
/**
* Returns the timestamp of when the event occurred, given in milliseconds
* since the start of epoch.
*
* @return timestamp in milliseconds
*/
long time();
/**
* Returns the type of the event.
*
* @return event type
*/
T type();
/**
* Returns the subject of the event.
*
* @return subject to which this event pertains
*/
S subject();
}
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