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annotate src/org/tmatesoft/hg/internal/ChangelogMonitor.java @ 656:a937e63b6e02

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Performance: rebuild information about branches takes too long (my improvement: 3 times, 11-15 s to less than 4 sec)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:40:03 +0200
parents 6526d8adbc0f
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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 org.tmatesoft.hg.core.Nodeid;
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20 import org.tmatesoft.hg.core.SessionContext;
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.repo.HgRuntimeException;
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23
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24 /**
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25 * Track changes to a repository based on recent changelog revision.
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26 * TODO shall be merged with {@link RevlogChangeMonitor} and {@link FileChangeMonitor} into
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27 * a single facility available from {@link SessionContext}
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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 class ChangelogMonitor {
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33 private final HgRepository repo;
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34 private int changelogRevCount = -1;
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35 private Nodeid changelogLastRev = null;
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36
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37 public ChangelogMonitor(HgRepository hgRepo) {
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38 repo = hgRepo;
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39 }
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40
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41 // memorize the state of the repository's changelog
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42 public void touch() throws HgRuntimeException {
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43 changelogRevCount = repo.getChangelog().getRevisionCount();
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44 changelogLastRev = safeGetRevision(changelogRevCount-1);
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45 }
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46
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47 // if present state doesn't match the one we remember
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48 public boolean isChanged() throws HgRuntimeException {
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49 int rc = repo.getChangelog().getRevisionCount();
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50 if (rc != changelogRevCount) {
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51 return true;
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52 }
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53 Nodeid r = safeGetRevision(rc-1);
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54 return !r.equals(changelogLastRev);
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55 }
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56
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57 // handles empty repository case
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58 private Nodeid safeGetRevision(int revIndex) throws HgRuntimeException {
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59 if (revIndex >= 0) {
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60 return repo.getChangelog().getRevision(revIndex);
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61 }
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62 return Nodeid.NULL;
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63 }
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64 }