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annotate src/org/tmatesoft/hg/internal/IterateControlMediator.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 1ee452f31187
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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.internal;
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18
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19 import org.tmatesoft.hg.internal.Lifecycle.Callback;
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20 import org.tmatesoft.hg.util.CancelSupport;
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21 import org.tmatesoft.hg.util.CancelledException;
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22
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23 /**
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24 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 public class IterateControlMediator {
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29
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30 private final CancelSupport src;
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31 private Callback receiver;
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32
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33 public IterateControlMediator(CancelSupport source, Lifecycle.Callback target) {
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34 assert target != null;
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35 src = source;
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36 receiver = target;
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37 }
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38
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39 public boolean checkCancelled() {
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40 if (src == null) {
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41 return false;
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42 }
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43 try {
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44 src.checkCancelled();
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45 return false;
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46 } catch (CancelledException ex) {
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47 receiver.stop();
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48 return true;
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49 }
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50 }
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51
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52 public void stop() {
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53 receiver.stop();
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54 }
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55 }