| /* |
| * Copyright 2010 Google Inc. All Rights Reserved. |
| * |
| * Licensed 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.groovy.util.concurrent.concurrentlinkedhashmap; |
| |
| import javax.annotation.concurrent.ThreadSafe; |
| |
| /** |
| * A class that can determine the weight of a value. The total weight threshold |
| * is used to determine when an eviction is required. |
| * |
| * @see <a href="http://code.google.com/p/concurrentlinkedhashmap/"> |
| * http://code.google.com/p/concurrentlinkedhashmap/</a> |
| */ |
| @ThreadSafe |
| public interface Weigher<V> { |
| |
| /** |
| * Measures an object's weight to determine how many units of capacity that |
| * the value consumes. A value must consume a minimum of one unit. |
| * |
| * @param value the object to weigh |
| * @return the object's weight |
| */ |
| int weightOf(V value); |
| } |