List<RemovalNotification<Integer, Integer>> notifications = new ArrayList<>();
    Cache<Integer, Integer> cache =
        CacheBuilder.newBuilder()
            .removalListener(
                new RemovalListener<Integer, Integer>() {
                  @Override
                  public void onRemoval(RemovalNotification<Integer, Integer> notification) {
                    notifications.add(notification);
                  }

notify_webhook        publish bucket notifications to webhook endpoints
notify_amqp           publish bucket notifications to AMQP endpoints
notify_kafka          publish bucket notifications to Kafka endpoints
notify_mqtt           publish bucket notifications to MQTT endpoints
notify_nats           publish bucket notifications to NATS endpoints
notify_nsq            publish bucket notifications to NSQ endpoints

```
notify_webhook        publish bucket notifications to webhook endpoints
notify_amqp           publish bucket notifications to AMQP endpoints
notify_kafka          publish bucket notifications to Kafka endpoints
notify_mqtt           publish bucket notifications to MQTT endpoints
notify_nats           publish bucket notifications to NATS endpoints

    </mailingList>
    <mailingList>
      <name>Maven Notifications List</name>
      <subscribe>notifications******@****.***</subscribe>
      <unsubscribe>notifications******@****.***</unsubscribe>
      <archive>http://mail-archives.apache.org/mod_mbox/maven-notifications/</archive>
      <otherArchives>
        <otherArchive>http://www.mail-archive.com/notifications@maven.apache.org</otherArchive>

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<K, V> asynchronous(

			Description:     "publish bucket notifications to webhook endpoints",
			MultipleTargets: true,
		},
		config.HelpKV{
			Key:             config.NotifyAMQPSubSys,
			Description:     "publish bucket notifications to AMQP endpoints",
			MultipleTargets: true,
		},
		config.HelpKV{
			Key:             config.NotifyKafkaSubSys,
			Description:     "publish bucket notifications to Kafka endpoints",
			MultipleTargets: true,

    assertWithMessage("Eviction notifications must be received")
        .that(removalListener.getCount())
        .isEqualTo(10);

    CacheTesting.expireEntries((LoadingCache<?, ?>) cache, EXPIRING_TIME, ticker);
    // ensure that no new notifications are sent
    assertWithMessage("Eviction notifications must be received")
        .that(removalListener.getCount())
        .isEqualTo(10);

    </mailingList>
    <mailingList>
      <name>Maven Notifications List</name>
      <subscribe>notifications******@****.***</subscribe>
      <unsubscribe>notifications******@****.***</unsubscribe>
      <archive>http://mail-archives.apache.org/mod_mbox/maven-notifications/</archive>
      <otherArchives>
        <otherArchive>http://www.mail-archive.com/notifications@maven.apache.org</otherArchive>

Cela comprend, par exemple :

* Les notifications par email envoyées après l'exécution d'une action :
    * Étant donné que se connecter à un serveur et envoyer un email a tendance à être «lent» (plusieurs secondes), vous pouvez retourner la réponse directement et envoyer la notification en arrière-plan.
* Traiter des données :

    // Verify that each received removal notification was valid
    for (RemovalNotification<String, String> notification : removalListener) {
      assertWithMessage("Invalid removal notification")
          .that(notification.getValue())
          .isEqualTo(notification.getKey());
    }

    CacheStats stats = cache.stats();