1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://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, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.cache; 18 19 import com.google.common.annotations.Beta; 20 21 /** 22 * Calculates the weights of cache entries. 23 * 24 * @author fry (at) google.com (Charles Fry) 25 * @since 11.0 26 */ 27 @Beta 28 public interface Weigher<K, V> { 29 30 /** 31 * Returns the weight of a cache entry. There is no unit for entry weights; rather they are simply 32 * relative to each other. 33 * 34 * @return the weight of the entry; must be non-negative 35 */ 36 int weigh(K key, V value); 37 38 } 39
