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diff --git a/lib/jetty/org/eclipse/jetty/util/Promise.java b/lib/jetty/org/eclipse/jetty/util/Promise.java
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+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 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);
+        }
+    }
+
+}