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annotate src/org/tmatesoft/hg/util/CancelSupport.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents f9f3e9b67ccc
children 91d75e1bac9f
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.util;
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18
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19 /**
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20 * Mix-in for objects that support cancellation.
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21 *
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22 * @author Artem Tikhomirov
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23 * @author TMate Software Ltd.
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24 */
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25 public interface CancelSupport {
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26
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27 /**
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28 * This method is invoked to check if target had been brought to canceled state. Shall silently return if target is
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29 * in regular state.
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30 * @throws CancelledException when target internal state has been changed to canceled.
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31 */
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32 void checkCancelled() throws CancelledException;
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33
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34
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35 // Yeah, this factory class looks silly now, but perhaps in the future I'll need wrappers for other cancellation sources?
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36 // just don't want to have general Utils class with methods like get() below
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37 static class Factory {
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38
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39 /**
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40 * Obtain non-null cancel support object.
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41 *
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42 * @param target any object (or <code>null</code>) that might have cancel support. For <code>null</code>, returns an instance than never cancels.
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43 * @return target if it's capable checking cancellation status or no-op implementation that never cancels.
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44 */
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45 public static CancelSupport get(Object target) {
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46 CancelSupport cs = get(target, null);
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47 if (cs != null) {
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48 return cs;
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49 }
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50 return new CancelSupport() {
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51 public void checkCancelled() {
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52 }
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53 };
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54 }
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55
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56 public static CancelSupport get(Object target, CancelSupport defaultValue) {
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57 if (target instanceof CancelSupport) {
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58 return (CancelSupport) target;
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59 }
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60 if (target instanceof Adaptable) {
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61 CancelSupport cs = ((Adaptable) target).getAdapter(CancelSupport.class);
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62 if (cs != null) {
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63 return cs;
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64 }
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65 }
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66 return defaultValue;
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67 }
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68 }
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70 interface Target<T> {
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71 T set(CancelSupport cs);
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72 }
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73 }