/*
* 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.streaming.api.checkpoint;
import java.io.Serializable;
import org.apache.flink.annotation.PublicEvolving;
/**
* This deprecated interface contains the methods for restoring from the legacy checkpointing mechanism of state.
* @param <T> type of the restored state.
*
* @deprecated Please use {@link CheckpointedFunction} or {@link ListCheckpointed} after restoring your legacy state.
*/
@Deprecated
@PublicEvolving
public interface CheckpointedRestoring<T extends Serializable> {
/**
* Restores the state of the function or operator to that of a previous checkpoint.
* This method is invoked when a function is executed as part of a recovery run.
*
* <p>Note that restoreState() is called before open().
*
* @param state The state to be restored.
*/
void restoreState(T state) throws Exception;
}