1 /**
2 * Copyright 2011 The Apache Software Foundation
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21 package org.apache.hadoop.hbase.io.hfile.slab;
22
23 /**
24 * Interface for objects that want to know when actions occur in a SingleSizeCache.
25 * */
26 interface SlabItemActionWatcher {
27
28 /**
29 * This is called as a callback when an item is removed from a SingleSizeCache.
30 *
31 * @param key the key of the item being evicted
32 * @param notifier the object notifying the SlabCache of the eviction.
33 */
34 void onEviction(String key, SingleSizeCache notifier);
35
36 /**
37 * This is called as a callback when an item is inserted into a SingleSizeCache.
38 *
39 * @param key the key of the item being added
40 * @param notifier the object notifying the SlabCache of the insertion..
41 */
42 void onInsertion(String key, SingleSizeCache notifier);
43 }