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annotate src/org/tmatesoft/hg/internal/FileChangeMonitor.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents 5c68567b3645
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610
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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
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21 /**
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22 * This shall become interface/abstract class accessible from SessionContext,
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23 * with plugable implementations, e.g. Java7 (file monitoring facilities) based,
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24 * or any other convenient means. It shall allow both "check at the moment asked"
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25 * and "collect changes and dispatch on demand" implementation approaches, so that
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26 * implementors may use best available technology
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class FileChangeMonitor {
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32 private final File file;
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33 private long lastModified;
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34 private long length;
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35
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36 /**
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37 * First round: support for 1-monitor-1-file only
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38 * Next round: 1-monitor-N files
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39 */
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40 public FileChangeMonitor(File f) {
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41 file = f;
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42 }
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43
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44 // shall work for files that do not exist
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45 public void touch(Object source) {
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46 lastModified = file.lastModified();
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47 length = file.length();
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48 }
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49
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50 public void check(Object source, Action onChange) {
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51 if (changed(source)) {
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52 onChange.changed();
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53 }
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54 }
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55
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56 public boolean changed(Object source) {
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57 if (file.lastModified() != lastModified) {
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58 return true;
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59 }
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60 return file.length() != length;
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61 }
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62
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63 public interface Action {
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64 public void changed();
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65 }
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66 }