| /* |
| * 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 listener registered for notification when an entry is evicted. An instance |
| * may be called concurrently by multiple threads to process entries. An |
| * implementation should avoid performing blocking calls or synchronizing on |
| * shared resources. |
| * <p> |
| * The listener is invoked by {@link ConcurrentLinkedHashMap} on a caller's |
| * thread and will not block other threads from operating on the map. An |
| * implementation should be aware that the caller's thread will not expect |
| * long execution times or failures as a side effect of the listener being |
| * notified. Execution safety and a fast turn around time can be achieved by |
| * performing the operation asynchronously, such as by submitting a task to an |
| * {@link java.util.concurrent.ExecutorService}. |
| * |
| * @see <a href="http://code.google.com/p/concurrentlinkedhashmap/"> |
| * http://code.google.com/p/concurrentlinkedhashmap/</a> |
| */ |
| @ThreadSafe |
| public interface EvictionListener<K, V> { |
| |
| /** |
| * A call-back notification that the entry was evicted. |
| * |
| * @param key the entry's key |
| * @param value the entry's value |
| */ |
| void onEviction(K key, V value); |
| } |