content: /*
   * 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.io.Serializable;
  
  /** Key Value Store interface. */
  public interface KeyValueStore<K, V> extends Serializable {
  
    /** put key value into store. */
    void put(K key, V value) throws IOException;
  
    /** get value from store. */
    V get(K key) throws IOException;
  
    /** remove key in the store. */
    void remove(K key) throws IOException;
  
    /** flush to disk. */
    void flush() throws IOException;
  
    /** clear all cache. */
    void clearCache();
  
    /** close the store. */
    void close() throws IOException;
  }
  