/**
* 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 backtype.storm.windowing;
import java.util.List;
/**
* A view of events in a sliding window.
*
* @param <T> the type of event that this window contains. E.g. {@link org.apache.storm.tuple.Tuple}
*/
public interface Window<T> {
/**
* Gets the list of events in the window.
*
* @return the list of events in the window.
*/
List<T> get();
/**
* Get the list of newly added events in the window since the last time the window was generated.
*
* @return the list of newly added events in the window.
*/
List<T> getNew();
/**
* Get the list of events expired from the window since the last time the window was generated.
*
* @return the list of events expired from the window.
*/
List<T> getExpired();
}