content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  // Includes work from:
  /*
   * 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 io.opentelemetry.instrumentation.api.internal.cache.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);
  }
  