2 * Copyright 2014-present Open Networking Foundation
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package io.atomix.utils.event;
19 * Abstraction of an of a time-stamped event pertaining to an arbitrary subject.
21 public interface Event<T, S> {
24 * Returns the timestamp of when the event occurred, given in milliseconds
25 * since the start of epoch.
27 * @return timestamp in milliseconds
32 * Returns the type of the event.
39 * Returns the subject of the event.
41 * @return subject to which this event pertains