/*
 * 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.taskexecutor.slot;

import java.io.IOException;
import java.util.Collection;
import java.util.Collections;

/** {@link SlotAllocationSnapshotPersistenceService} that does nothing. */
public enum NoOpSlotAllocationSnapshotPersistenceService
        implements SlotAllocationSnapshotPersistenceService {
    INSTANCE;

    @Override
    public void persistAllocationSnapshot(SlotAllocationSnapshot slotAllocationSnapshot)
            throws IOException {}

    @Override
    public void deleteAllocationSnapshot(int slotIndex) {}

    @Override
    public Collection<SlotAllocationSnapshot> loadAllocationSnapshots() {
        return Collections.emptyList();
    }
}
