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/*
 * 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 io.ray.streaming.state.store;

import java.io.IOException;
import java.util.Map;

/**
 * Key Map Store interface.
 */
public interface KeyMapStore extends KeyValueStore> {

  /**
   * put sub key value into the store incrementally.
   */
  void put(K key, S subKey, T value) throws IOException;

  /**
   * get subValue from store.
   */
  T get(K key, S subKey) throws IOException;
}