/* * Copyright 2014-present 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(); }