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//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import org.eclipse.jetty.util.log.Log;
/**
* <p>A callback abstraction that handles completed/failed events of asynchronous operations.</p>
*
* @param <C> the type of the context object
*/
public interface Promise<C>
{
/**
* <p>Callback invoked when the operation completes.</p>
*
* @param result the context
* @see #failed(Throwable)
*/
public abstract void succeeded(C result);
/**
* <p>Callback invoked when the operation fails.</p>
*
* @param x the reason for the operation failure
*/
public void failed(Throwable x);
/**
* <p>Empty implementation of {@link Promise}</p>
*
* @param <C> the type of the context object
*/
public static class Adapter<C> implements Promise<C>
{
@Override
public void succeeded(C result)
{
}
@Override
public void failed(Throwable x)
{
Log.getLogger(this.getClass()).warn(x);
}
}
}
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