1 //
2 // ========================================================================
3 // Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.spdy.api;
20
21 /**
22 * <p>A callback abstraction that handles completed/failed events of asynchronous operations.</p>
23 * <p>Instances of this class capture a context that is made available on the completion callback.</p>
24 *
25 * @param <C> the type of the context object
26 */
27 public interface Handler<C>
28 {
29 /**
30 * <p>Callback invoked when the operation completes.</p>
31 *
32 * @param context the context
33 * @see #failed(Object, Throwable)
34 */
35 public abstract void completed(C context);
36
37 /**
38 * <p>Callback invoked when the operation fails.</p>
39 * @param context the context
40 * @param x the reason for the operation failure
41 */
42 public void failed(C context, Throwable x);
43
44 /**
45 * <p>Empty implementation of {@link Handler}</p>
46 *
47 * @param <C> the type of the context object
48 */
49 public static class Adapter<C> implements Handler<C>
50 {
51 @Override
52 public void completed(C context)
53 {
54 }
55
56 @Override
57 public void failed(C context, Throwable x)
58 {
59 }
60 }
61 }