/*
 * 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.streams.kstream.Window;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.processor.StateStore;

/**
 * Interface for storing the aggregated values of sessions along with their record headers.
 * <p>
 * The key is internally represented as {@link Windowed Windowed&lt;K&gt;} that comprises the plain
 * key and the {@link Window} that represents window start- and end-timestamp.
 * <p>
 * If two sessions are merged, a new session with new start- and end-timestamp must be inserted into
 * the store while the two old sessions must be deleted.
 *
 * @param <K>   type of the record keys
 * @param <AGG> type of the aggregated values
 */
public interface SessionStoreWithHeaders<K, AGG> extends StateStore, SessionStore<K, AggregationWithHeaders<AGG>>  {

}
