1 /* |
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2 * Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package sun.nio.ch; |
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27 |
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28 import java.nio.channels.AsynchronousChannel; |
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29 import java.util.concurrent.Future; |
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30 |
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31 /** |
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32 * Base implementation of Future used for asynchronous I/O |
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33 */ |
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34 |
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35 abstract class AbstractFuture<V,A> |
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36 implements Future<V> |
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37 { |
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38 private final AsynchronousChannel channel; |
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39 private final A attachment; |
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40 |
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41 protected AbstractFuture(AsynchronousChannel channel, A attachment) { |
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42 this.channel = channel; |
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43 this.attachment = attachment; |
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44 } |
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45 |
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46 final AsynchronousChannel channel() { |
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47 return channel; |
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48 } |
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49 |
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50 final A attachment() { |
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51 return attachment; |
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52 } |
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53 |
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54 /** |
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55 * Returns the result of the operation if it has completed successfully. |
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56 */ |
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57 abstract V value(); |
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58 |
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59 /** |
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60 * Returns the exception if the operation has failed. |
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61 */ |
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62 abstract Throwable exception(); |
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63 } |
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