1 /* 2 * Copyright 2015 The Netty Project 3 * 4 * The Netty Project licenses this file to you under the Apache License, 5 * version 2.0 (the "License"); you may not use this file except in compliance 6 * with the License. You may obtain a copy of the License at: 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations 14 * under the License. 15 */ 16 package io.netty.buffer; 17 18 /** 19 * Metrics for a sub-page. 20 */ 21 public interface PoolSubpageMetric { 22 23 /** 24 * Return the number of maximal elements that can be allocated out of the sub-page. 25 */ 26 int maxNumElements(); 27 28 /** 29 * Return the number of available elements to be allocated. 30 */ 31 int numAvailable(); 32 33 /** 34 * Return the size (in bytes) of the elements that will be allocated. 35 */ 36 int elementSize(); 37 38 /** 39 * Return the page size (in bytes) of this page. 40 */ 41 int pageSize(); 42 } 43