frankvicky commented on code in PR #21486: URL: https://github.com/apache/kafka/pull/21486#discussion_r2818359059
########## streams/src/main/java/org/apache/kafka/streams/state/TimestampedWindowStoreWithHeaders.java: ########## @@ -0,0 +1,154 @@ +/* + * 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.kafka.streams.state; + +import org.apache.kafka.common.header.Headers; +import org.apache.kafka.streams.errors.InvalidStateStoreException; +import org.apache.kafka.streams.kstream.Windowed; + +import java.time.Instant; + +/** + * Interface for storing the aggregated values of fixed-size time windows. + * <p> + * Note, that the stores's physical key type is {@link Windowed Windowed<K>}. + * In contrast to a {@link WindowStore} that stores plain windowedKeys-value pairs, + * a {@code TimestampedWindowStore} stores windowedKeys-(value/timestamp) pairs. + * <p> + * While the window start- and end-timestamp are fixed per window, the value-side timestamp is used + * to store the last update timestamp of the corresponding window. + * + * @param <K> Type of keys + * @param <V> Type of values + */ +public interface TimestampedWindowStoreWithHeaders<K, V> extends WindowStore<K, ValueTimestampHeaders<V>> { Review Comment: I initially over-engineered it with all those `xxxWithHeaders()` methods, but that was unnecessary. The generic parameter change alone gives us everything we need. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
