/*
 *  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.codehaus.groovy.runtime.memoize;

/**
 * Protects stored resources from eviction from memory following the LRU (Last Recently Used) strategy.
 * The touch method can be used to renew an element and move it to the from the LRU queue.
 */
interface ProtectionStorage<K, V> {
    /**
     * Marks an entry as recently used and updates the protected value stored
     * for the supplied key.
     *
     * @param key the key to refresh
     * @param value the value to protect
     */
    void touch(K key, V value);
}
