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annotate src/org/tmatesoft/hg/internal/CompleteRepoLock.java @ 710:cf200271439a

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 07 Oct 2013 01:56:05 +0200
parents 65c01508f002
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65c01508f002 Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 2013 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 static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20
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21 import org.tmatesoft.hg.core.HgRepositoryLockException;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.repo.HgRepositoryLock;
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24 import org.tmatesoft.hg.util.LogFacility;
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25
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26 /**
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27 * Helper to lock both storage and working directory
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public final class CompleteRepoLock {
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33
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34 private final HgRepository repo;
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35 private HgRepositoryLock wdLock, storeLock;
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36
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37 public CompleteRepoLock(HgRepository hgRepo) {
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38 repo = hgRepo;
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39 }
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40
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41 public void acquire() throws HgRepositoryLockException {
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42 wdLock = repo.getWorkingDirLock();
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43 storeLock = repo.getStoreLock();
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44 wdLock.acquire();
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45 try {
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46 storeLock.acquire();
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47 } catch (HgRepositoryLockException ex) {
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48 try {
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49 wdLock.release();
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50 } catch (HgRepositoryLockException e2) {
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51 final LogFacility log = repo.getSessionContext().getLog();
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52 log.dump(getClass(), Error, e2, "Nested exception ignored once failed to acquire store lock");
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53 }
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54 throw ex;
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55 }
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56
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57 }
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58
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59 public void release() throws HgRepositoryLockException {
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60 try {
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61 storeLock.release();
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62 } catch (HgRepositoryLockException ex) {
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63 try {
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64 wdLock.release();
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65 } catch (HgRepositoryLockException e2) {
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66 final LogFacility log = repo.getSessionContext().getLog();
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67 log.dump(getClass(), Error, e2, "Nested exception ignored when releasing working directory lock");
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68 }
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69 throw ex;
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70 }
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71 wdLock.release();
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72 }
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73 }