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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty5.util.concurrent;
18  
19  /**
20   * Listens to the result of a {@link Future}.  The result of the asynchronous operation is notified once this listener
21   * is added by calling {@link Future#addListener(FutureListener)}.
22   * <pre>
23   * Future f = new DefaultPromise(..);
24   * f.addListener(future -> { .. });
25   * </pre>
26   */
27  @FunctionalInterface
28  public interface FutureListener<V> {
29      /**
30       * Invoked when the operation associated with the {@link Future} has been completed.
31       *
32       * @param future  the source {@link Future} which called this callback
33       */
34      void operationComplete(Future<? extends V> future) throws Exception;
35  }