/*
* 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.flink.api.common.state;
import org.apache.flink.annotation.PublicEvolving;
/**
* Extension of {@link AppendingState} that allows merging of state. That is, two instances
* of {@link MergingState} can be combined into a single instance that contains all the
* information of the two merged states.
*
* @param <IN> Type of the value that can be added to the state.
* @param <OUT> Type of the value that can be retrieved from the state.
*/
@PublicEvolving
public interface MergingState<IN, OUT> extends AppendingState<IN, OUT> { }