| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.trident.windowing; |
| |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.trident.operation.TridentCollector; |
| |
| /** |
| * InMemoryWindowsStoreFactory contains a single instance of {@link InMemoryWindowsStore} which will be used for storing tuples and triggers |
| * of the window. The same InMemoryWindowsStoreFactory instance is passed to {@link WindowsStateUpdater}, which removes successfully emitted |
| * triggers from the same {@code inMemoryWindowsStore} instance in {@link WindowsStateUpdater#updateState(WindowsState, List, |
| * TridentCollector)}. |
| */ |
| public class InMemoryWindowsStoreFactory implements WindowsStoreFactory { |
| |
| private InMemoryWindowsStore inMemoryWindowsStore; |
| |
| @Override |
| public WindowsStore create(Map<String, Object> topoConf) { |
| if (inMemoryWindowsStore == null) { |
| inMemoryWindowsStore = new InMemoryWindowsStore(); |
| } |
| return inMemoryWindowsStore; |
| } |
| } |