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annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 200:114c9fe7b643

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Performance optimization: reduce memory ParentWalker hogs
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Apr 2011 21:14:51 +0200
parents e2115da4cf6a
children 047b1dec7a04
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1 /*
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2 * Copyright (c) 2010-2011 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.repo;
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19 import java.io.IOException;
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21 import org.tmatesoft.hg.core.HgBadStateException;
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22 import org.tmatesoft.hg.core.Nodeid;
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23 import org.tmatesoft.hg.internal.DataAccess;
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24 import org.tmatesoft.hg.internal.Pool;
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25 import org.tmatesoft.hg.internal.RevlogStream;
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28 /**
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class HgManifest extends Revlog {
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34
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35 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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36 super(hgRepo, content);
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37 }
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38
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39 public void walk(int start, int end, final Inspector inspector) {
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40 if (inspector == null) {
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41 throw new IllegalArgumentException();
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42 }
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43 content.iterate(start, end, true, new ManifestParser(inspector));
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44 }
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45
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46 public interface Inspector {
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47 boolean begin(int revision, Nodeid nid);
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48 boolean next(Nodeid nid, String fname, String flags);
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49 boolean end(int revision);
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50 }
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51
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52 private static class ManifestParser implements RevlogStream.Inspector {
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53 private boolean gtg = true; // good to go
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54 private final Inspector inspector;
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55 private final Pool<Nodeid> nodeidPool;
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56 private final Pool<String> fnamePool;
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57 private final Pool<String> flagsPool;
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58
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59 public ManifestParser(Inspector delegate) {
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60 assert delegate != null;
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61 inspector = delegate;
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62 nodeidPool = new Pool<Nodeid>();
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63 fnamePool = new Pool<String>();
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64 flagsPool = new Pool<String>();
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65 }
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66
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67 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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68 if (!gtg) {
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69 return;
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70 }
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71 try {
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72 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true));
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73 int i;
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74 String fname = null;
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75 String flags = null;
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76 Nodeid nid = null;
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77 byte[] data = da.byteArray();
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78 for (i = 0; gtg && i < actualLen; i++) {
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79 int x = i;
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80 for( ; data[i] != '\n' && i < actualLen; i++) {
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81 if (fname == null && data[i] == 0) {
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82 fname = fnamePool.unify(new String(data, x, i - x));
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83 x = i+1;
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84 }
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85 }
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86 if (i < actualLen) {
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87 assert data[i] == '\n';
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88 int nodeidLen = i - x < 40 ? i-x : 40;
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89 nid = nodeidPool.unify(Nodeid.fromAscii(data, x, nodeidLen));
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90 if (nodeidLen + x < i) {
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91 // 'x' and 'l' for executable bits and symlinks?
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92 // hg --debug manifest shows 644 for each regular file in my repo
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93 flags = flagsPool.unify(new String(data, x + nodeidLen, i-x-nodeidLen));
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94 }
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95 gtg = gtg && inspector.next(nid, fname, flags);
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96 }
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97 nid = null;
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98 fname = flags = null;
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99 }
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100 gtg = gtg && inspector.end(revisionNumber);
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101 } catch (IOException ex) {
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102 throw new HgBadStateException(ex);
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103 }
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104 }
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105 }
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106 }