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 import java.util.concurrent.Executor; 22 23 /** 24 * A collection of common removal listeners. 25 * 26 * @author Charles Fry 27 * @since 10.0 28 */ 29 @Beta 30 public final class RemovalListeners { 31 32 private RemovalListeners() {} 33 34 /** 35 * Returns a {@code RemovalListener} which processes all eviction 36 * notifications using {@code executor}. 37 * 38 * @param listener the backing listener 39 * @param executor the executor with which removal notifications are 40 * asynchronously executed 41 */ 42 public static <K, V> RemovalListener<K, V> asynchronous( 43 final RemovalListener<K, V> listener, final Executor executor) { 44 return new RemovalListener<K, V>() { 45 @Override 46 public void onRemoval(final RemovalNotification<K, V> notification) { 47 executor.execute(new Runnable() { 48 @Override 49 public void run() { 50 listener.onRemoval(notification); 51 } 52 }); 53 } 54 }; 55 } 56 57 } 58
