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Java example source code file (RemovalListeners.java)

This example Java source code file (RemovalListeners.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

executor, gwtincompatible, override, removallistener, removallisteners, removalnotification, runnable, threading, threads

The RemovalListeners.java Java example source code

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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 com.google.common.cache;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtIncompatible;

import java.util.concurrent.Executor;

/**
 * A collection of common removal listeners.
 *
 * @author Charles Fry
 * @since 10.0
 */
@GwtIncompatible
public final class RemovalListeners {

  private RemovalListeners() {}

  /**
   * Returns a {@code RemovalListener} which processes all eviction notifications using
   * {@code executor}.
   *
   * @param listener the backing listener
   * @param executor the executor with which removal notifications are asynchronously executed
   */
  public static <K, V> RemovalListener asynchronous(
      final RemovalListener<K, V> listener, final Executor executor) {
    checkNotNull(listener);
    checkNotNull(executor);
    return new RemovalListener<K, V>() {
      @Override
      public void onRemoval(final RemovalNotification<K, V> notification) {
        executor.execute(
            new Runnable() {
              @Override
              public void run() {
                listener.onRemoval(notification);
              }
            });
      }
    };
  }
}

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