/**
*
* 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.hadoop.hbase.io.hfile.slab;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.hfile.BlockCacheKey;
/**
* Interface for objects that want to know when actions occur in a SingleSizeCache.
* */
@InterfaceAudience.Private
interface SlabItemActionWatcher {
/**
* This is called as a callback when an item is removed from a SingleSizeCache.
*
* @param key the key of the item being evicted
* @param notifier the object notifying the SlabCache of the eviction.
*/
void onEviction(BlockCacheKey key, SingleSizeCache notifier);
/**
* This is called as a callback when an item is inserted into a SingleSizeCache.
*
* @param key the key of the item being added
* @param notifier the object notifying the SlabCache of the insertion..
*/
void onInsertion(BlockCacheKey key, SingleSizeCache notifier);
}