| /** |
| * 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.topology; |
| |
| import org.apache.storm.state.State; |
| |
| /** |
| * A windowed bolt abstraction for supporting windowing operation with state. |
| */ |
| public interface IStatefulWindowedBolt<T extends State> extends IStatefulComponent<T>, IWindowedBolt { |
| /** |
| * If the stateful windowed bolt should have its windows persisted in state and maintain a subset of events in memory. |
| * <p> |
| * The default is to keep all the window events in memory. |
| * </p> |
| * |
| * @return true if the windows should be persisted |
| */ |
| default boolean isPersistent() { |
| return false; |
| } |
| |
| /** |
| * The maximum number of window events to keep in memory. |
| */ |
| default long maxEventsInMemory() { |
| return 1_000_000L; // default |
| } |
| } |