/**
* 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 storm.trident.windowing;
import java.util.List;
import 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() {
if (inMemoryWindowsStore == null) {
inMemoryWindowsStore = new InMemoryWindowsStore();
}
return inMemoryWindowsStore;
}
}