| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.jackrabbit.oak.plugins.document.cache; |
| |
| import com.google.common.cache.RemovalListener; |
| import com.google.common.cache.RemovalNotification; |
| |
| /** |
| * Listener which forwards the notifications to a delegate. It is used to bridge |
| * multiple instances. |
| * |
| */ |
| public class ForwardingListener<K, V> |
| implements RemovalListener<K, V> { |
| private RemovalListener<K, V> delegate; |
| |
| public ForwardingListener() { |
| } |
| |
| public ForwardingListener(RemovalListener<K, V> delegate) { |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public void onRemoval(RemovalNotification<K, V> notification) { |
| if (delegate != null) { |
| delegate.onRemoval(notification); |
| } |
| } |
| |
| public void setDelegate(RemovalListener<K, V> delegate) { |
| this.delegate = delegate; |
| } |
| |
| public static <K, V> ForwardingListener<K, V> newInstance() { |
| return new ForwardingListener<K, V>(); |
| } |
| |
| public static <K, V> ForwardingListener<K, V> newInstance(RemovalListener<K, V> delegate) { |
| return new ForwardingListener<K, V>(delegate); |
| } |
| } |