1090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2011 The Guava Authors 3090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 4090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * you may not use this file except in compliance with the License. 6090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * You may obtain a copy of the License at 7090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 8090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 10090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * See the License for the specific language governing permissions and 14090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * limitations under the License. 15090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 16090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.cache; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.Beta; 20090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 21090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/** 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Calculates the weights of cache entries. 23090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author fry@google.com (Charles Fry) 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 11.0 26090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@Beta 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic interface Weigher<K, V> { 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 30090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson /** 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the weight of a cache entry. There is no unit for entry weights; rather they are simply 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * relative to each other. 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @return the weight of the entry; must be non-negative 35090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int weigh(K key, V value); 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 38090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson} 39