Esto incluye, por ejemplo:

* Notificaciones por email enviadas después de realizar una acción:
  * Como conectarse a un servidor de email y enviar un email tiende a ser "lento" (varios segundos), puedes devolver el response de inmediato y enviar la notificación por email en segundo plano.
* Procesamiento de datos:

    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);
                  }

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(

    del_branch_on_merge: true
  protected_branches:
    master: {}
    maven-4.0.x: {}
    maven-3.9.x: {}
    maven-3.8.x: {}
    maven-3.0.x: {}
    pre-reset-master: {}
  features:
    issues: true
notifications:
  commits: ******@****.***
  issues: ******@****.***

    /**
     * Checks if directory change notifications are enabled for cache invalidation
     * @return true if change notifications are enabled
     */
    public boolean isNotificationEnabled() {
        return notificationEnabled;
    }

    /**
     * Enables or disables directory change notifications
     * @param notificationEnabled true to enable change notifications
     */

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcifs;

import java.util.List;
import java.util.concurrent.Callable;

/**
 * Handle for receiving change notifications from an SMB server
 *
 *
 * @author mbechler
 *
 */
public interface SmbWatchHandle extends AutoCloseable, Callable<List<FileNotifyInformation>> {

    /**
     * Get the next set of changes
     *

 */
public interface NotifyResponse extends CommonServerMessageBlockResponse {

    /**
     * Gets the file notification information from the response.
     * @return notify information containing file change notifications
     */
    List<FileNotifyInformation> getNotifyInformation();

import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.mail.CardView;
import org.dbflute.mail.send.supplement.SMailPostingDiscloser;

/**
 * Helper class for sending notifications to various platforms.
 */
public class NotificationHelper {

    /**
     * Default constructor.
     */
    public NotificationHelper() {
        // Default constructor
    }

Ceci est utile pour les opérations qui doivent avoir lieu après une requête, mais où le client n'a pas réellement besoin d'attendre que l'opération soit terminée pour recevoir une réponse.

Cela comprend, par exemple :

* Les notifications par email envoyées après l'exécution d'une action :

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Mock witness service for integration testing.
 * Simulates a basic witness service that can accept registrations
 * and send notifications.
 */
public class MockWitnessService implements AutoCloseable {
    private static final Logger log = LoggerFactory.getLogger(MockWitnessService.class);

    private ServerSocket serverSocket;