    001    /*
    002     * Copyright (C) 2010 The Guava Authors
    003     *
    004     * Licensed under the Apache License, Version 2.0 (the "License");
    005     * you may not use this file except in compliance with the License.
    006     * You may obtain a copy of the License at
    007     *
    008     * http://www.apache.org/licenses/LICENSE-2.0
    009     *
    010     * Unless required by applicable law or agreed to in writing, software
    011     * distributed under the License is distributed on an "AS IS" BASIS,
    012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    013     * See the License for the specific language governing permissions and
    014     * limitations under the License.
    015     */
    016
    017    package com.google.common.collect;
    018
    019    import com.google.common.annotations.Beta;
    020
    021    import javax.annotation.Nullable;
    022
    023    /**
    024     * An object that can receive a notification when an entry is evicted from a
    025     * map.
    026     *
    027     * <p>An instance may be called concurrently by multiple threads to process
    028     * different entries. Implementations of this interface should avoid performing
    029     * blocking calls or synchronizing on shared resources.
    030     *
    031     * @param <K> the type of keys being evicted
    032     * @param <V> the type of values being evicted
    033     * @author Ben Manes
    034     * @since 7.0
    035     * @deprecated use {@link MapMaker.RemovalListener} <b>This class is scheduled
    036     *     for deletion from Guava in Guava release 11.0.</b>
    037     */
    038    @Beta
    039    @Deprecated
    040    public
    041    interface MapEvictionListener<K, V> {
    042
    043      /**
    044       * Notifies the listener that an eviction has occurred. Eviction may be for
    045       * reasons such as timed expiration, exceeding a maximum size, or due to
    046       * garbage collection. Eviction notification does <i>not</i> occur due to
    047       * manual removal.
    048       *
    049       * @param key the key of the entry that has already been evicted, or {@code
    050       *     null} if its reference was collected
    051       * @param value the value of the entry that has already been evicted, or
    052       *     {@code null} if its reference was collected
    053       */
    054      void onEviction(@Nullable K key, @Nullable V value);
    055    }