content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.transport;
  
  import java.util.function.Consumer;
  
  /**
   * Context for unregistering a registered listener.
   *
   * The listener context represents a registered listener.
   * The context is normally returned when a {@link Consumer} is
   * registered and can be used to unregister the listener via {@link #close()}.
   *
   * @param <T> event type
   */
  public interface Listener<T> extends Consumer<T>, AutoCloseable {
    /**
     * Closes the listener.
     * When the listener is closed, the listener will be unregistered
     * and will no longer receive events for which it was listening.
     */
    void close();
  }
  