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 }