2 // ========================================================================
3 // Copyright (c) 1995-2014 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.
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
19 package org.eclipse.jetty.util;
21 import org.eclipse.jetty.util.log.Log;
24 * <p>A callback abstraction that handles completed/failed events of asynchronous operations.</p>
26 * @param <C> the type of the context object
28 public interface Promise<C>
31 * <p>Callback invoked when the operation completes.</p>
33 * @param result the context
34 * @see #failed(Throwable)
36 public abstract void succeeded(C result);
39 * <p>Callback invoked when the operation fails.</p>
41 * @param x the reason for the operation failure
43 public void failed(Throwable x);
47 * <p>Empty implementation of {@link Promise}</p>
49 * @param <C> the type of the context object
51 public static class Adapter<C> implements Promise<C>
54 public void succeeded(C result)
59 public void failed(Throwable x)
61 Log.getLogger(this.getClass()).warn(x);