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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 org.apache.flink.runtime.scheduler;

import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID;
import org.apache.flink.runtime.taskmanager.TaskManagerLocation;

import java.util.Optional;

/** Component to retrieve the state location of an execution vertex. */
@FunctionalInterface
public interface StateLocationRetriever {

    /**
     * Returns state location of an execution vertex.
     *
     * @param executionVertexId id of the execution vertex
     * @return optional that is assigned with the vertex's state location if the location exists,
     *     otherwise empty
     */
    Optional getStateLocation(ExecutionVertexID executionVertexId);
}