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annotate src/org/tmatesoft/hg/internal/RevlogChangeMonitor.java @ 620:272ecffccc8a

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 18 May 2013 21:55:31 +0200
parents 66f1cc23b906
children 99ad1e3a4e4d
rev   line source
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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 java.io.File;
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20 import java.util.WeakHashMap;
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21
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22 /**
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23 * Detect changes to revlog files. Not a general file change monitoring as we utilize the fact revlogs are append-only (and even in case
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24 * of stripped-off tail revisions, with e.g. mq, detection approach is still valid).
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 public class RevlogChangeMonitor {
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30
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31 private final WeakHashMap<File, Long> lastKnownSize;
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32 private final File soleFile;
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33 private long soleFileLength = -1;
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34
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35 // use single for multiple files. TODO repository/session context shall provide
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36 // alternative (configurable) implementations, so that Java7 users may supply better one
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37 public RevlogChangeMonitor() {
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38 lastKnownSize = new WeakHashMap<File, Long>();
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39 soleFile = null;
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40 }
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41
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42 public RevlogChangeMonitor(File f) {
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43 assert f != null;
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44 lastKnownSize = null;
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45 soleFile = f;
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46 }
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47
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48 public void touch(File f) {
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49 assert f != null;
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50 if (lastKnownSize == null) {
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51 assert f == soleFile;
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52 soleFileLength = f.length();
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53 } else {
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54 lastKnownSize.put(f, f.length());
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55 }
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56 }
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57
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58 public boolean hasChanged(File f) {
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59 assert f != null;
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60 if (lastKnownSize == null) {
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61 assert f == soleFile;
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62 return soleFileLength != f.length();
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63 } else {
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64 Long lastSize = lastKnownSize.get(f);
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65 if (lastSize == null) {
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66 return true;
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67 }
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68 return f.length() != lastSize;
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69 }
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70 }
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71 }