flink-runtime/src/test/java/org/apache/flink/runtime/util/NoOpGroupCache.java

/*
 * 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.util;

/** Non op implement of {@link GroupCache}. */
public class NoOpGroupCache<G, K, V> implements GroupCache<G, K, V> {

    @Override
    public void clear() {}

    @Override
    public V get(G group, K key) {
        return null;
    }

    @Override
    public void put(G group, K key, V value) {}

    @Override
    public void clearCacheForGroup(G group) {}
}