diff -r 115e09b7a004 -r 3acf8e5e2ca0 jdk/src/share/classes/java/nio/channels/CompletionHandler.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/nio/channels/CompletionHandler.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2007-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.nio.channels;
+
+/**
+ * A handler for consuming the result of an asynchronous I/O operation.
+ *
+ * <p> The asynchronous channels defined in this package allow a completion
+ * handler to be specified to consume the result of an asynchronous operation.
+ * The {@link #completed completed} method is invoked when the I/O operation
+ * completes successfully. The {@link #failed failed} method is invoked if the
+ * I/O operations fails. The {@link #cancelled cancelled} method is invoked when
+ * the I/O operation is cancelled by invoking the {@link
+ * java.util.concurrent.Future#cancel cancel} method. The implementations of
+ * these methods should complete in a timely manner so as to avoid keeping the
+ * invoking thread from dispatching to other completion handlers.
+ *
+ * @param   <V>     The result type of the I/O operation
+ * @param   <A>     The type of the object attached to the I/O operation
+ *
+ * @since 1.7
+ */
+
+public interface CompletionHandler<V,A> {
+
+    /**
+     * Invoked when an operation has completed.
+     *
+     * @param   result
+     *          The result of the I/O operation.
+     * @param   attachment
+     *          The object attached to the I/O operation when it was initiated.
+     */
+    void completed(V result, A attachment);
+
+    /**
+     * Invoked when an operation fails.
+     *
+     * @param   exc
+     *          The exception to indicate why the I/O operation failed
+     * @param   attachment
+     *          The object attached to the I/O operation when it was initiated.
+     */
+    void failed(Throwable exc, A attachment);
+
+    /**
+     * Invoked when an operation is cancelled by invoking the {@link
+     * java.util.concurrent.Future#cancel cancel} method.
+     *
+     * @param   attachment
+     *          The object attached to the I/O operation when it was initiated.
+     */
+    void cancelled(A attachment);
+}