| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.apache.storm.windowing; |
| |
| /** |
| * An event is a wrapper object that gets stored in the window. |
| * |
| * @param <T> the type of the object thats wrapped. E.g Tuple |
| */ |
| public interface Event<T> { |
| /** |
| * The event timestamp in millis. This could be the time when the source generated the tuple or the time when the tuple was received by |
| * a bolt. |
| * |
| * @return the event timestamp in milliseconds. |
| */ |
| long getTimestamp(); |
| |
| /** |
| * Returns the wrapped object, E.g. a tuple |
| * |
| * @return the wrapped object. |
| */ |
| T get(); |
| |
| /** |
| * If this is a watermark event or not. Watermark events are used for tracking time while processing event based ts. |
| * |
| * @return true if this is a watermark event |
| */ |
| boolean isWatermark(); |
| } |