1 /*

     2  * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.nio.ch;

    27 

    28 import java.nio.channels.AsynchronousChannel;

    29 import java.util.concurrent.Future;

    30 

    31 /**

    32  * Base implementation of Future used for asynchronous I/O

    33  */

    34 

    35 abstract class AbstractFuture<V,A>

    36     implements Future<V>

    37 {

    38     private final AsynchronousChannel channel;

    39     private final A attachment;

    40 

    41     protected AbstractFuture(AsynchronousChannel channel, A attachment) {

    42         this.channel = channel;

    43         this.attachment = attachment;

    44     }

    45 

    46     final AsynchronousChannel channel() {

    47         return channel;

    48     }

    49 

    50     final A attachment() {

    51         return attachment;

    52     }

    53 

    54     /**

    55      * Returns the result of the operation if it has completed successfully.

    56      */

    57     abstract V value();

    58 

    59     /**

    60      * Returns the exception if the operation has failed.

    61      */

    62     abstract Throwable exception();

    63 }