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annotate src/org/tmatesoft/hg/internal/RevisionLookup.java @ 624:507602cb4fb3

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FIXMEs and TODOs: pay some technical debt
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 20 May 2013 20:34:33 +0200
parents 46f29b73e51e
children 6526d8adbc0f
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 static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20
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21 import java.util.Arrays;
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22
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23 import org.tmatesoft.hg.core.Nodeid;
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24 import org.tmatesoft.hg.repo.HgRevisionMap;
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25
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26 /**
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27 * Lite alternative to {@link HgRevisionMap}, to speed up nodeid to index conversion without consuming too much memory.
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28 * E.g. for a 100k revisions, {@link HgRevisionMap} consumes 3 * (N * sizeof(int)) for indexes plus 48 bytes per
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29 * Nodeid instance, total (12+48)*N = 6 mb of memory. {RevisionLookup} instead keeps only Nodeid hashes, (N * sizeof(int) = 400 kb),
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30 * but is slower in lookup, O(N/2) to find potential match plus disk read operatin (or few, in an unlikely case of hash collisions).
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class RevisionLookup implements RevlogStream.Inspector {
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36
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37 private final RevlogStream content;
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38 private int[] nodeidHashes;
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39
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40 public RevisionLookup(RevlogStream stream) {
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41 assert stream != null;
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42 content = stream;
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43 }
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44
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45 public static RevisionLookup createFor(RevlogStream stream) {
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46 RevisionLookup rv = new RevisionLookup(stream);
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47 int revCount = stream.revisionCount();
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48 rv.prepare(revCount);
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49 if (revCount > 0) {
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50 stream.iterate(0, revCount - 1, false, rv);
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51 }
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52 return rv;
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53 }
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54
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55 public void prepare(int count) {
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56 nodeidHashes = new int[count];
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57 Arrays.fill(nodeidHashes, BAD_REVISION);
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58 }
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59 public void next(int index, byte[] nodeid) {
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60 nodeidHashes[index] = Nodeid.hashCode(nodeid);
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61 }
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62 public void next(int index, Nodeid nodeid) {
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63 nodeidHashes[index] = nodeid.hashCode();
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64 }
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65 public int findIndex(Nodeid nodeid) {
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66 final int hash = nodeid.hashCode();
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67 for (int i = 0; i < nodeidHashes.length; i++) {
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68 if (nodeidHashes[i] == hash) {
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69 byte[] nodeidAtI = content.nodeid(i);
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70 if (nodeid.equalsTo(nodeidAtI)) {
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71 return i;
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72 }
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73 }
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74 // else: false match (only 4 head bytes matched, continue loop
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75 }
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76 return BAD_REVISION;
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77 }
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78
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79 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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80 next(revisionIndex, nodeid);
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81 }
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82 }