/*
* 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.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}.
*
* @author ben.manes@gmail.com (Ben Manes)
* @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);
}