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annotate src/org/tmatesoft/hg/internal/RevlogDump.java @ 198:33a7d76f067b

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Performance optimization: reduce memory to keep revlog cached info
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Apr 2011 05:40:14 +0200
parents e9d275fb0bc0
children d45ad07dc94c
rev   line source
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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.internal;
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18
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19 import java.io.BufferedInputStream;
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20 import java.io.DataInput;
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21 import java.io.DataInputStream;
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22 import java.io.File;
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23 import java.io.FileInputStream;
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24 import java.math.BigInteger;
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25 import java.util.zip.Inflater;
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26
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27 /**
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28 * Utility to test/debug/troubleshoot
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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 RevlogDump {
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34
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35 /**
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36 * Takes 3 command line arguments -
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37 * repository path,
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38 * path to index file (i.e. store/data/hello.c.i) in the repository (relative)
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39 * and "dumpData" whether to print actual content or just revlog headers
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40 */
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41 public static void main(String[] args) throws Exception {
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42 String repo = "/temp/hg/hello/.hg/";
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43 String filename = "store/00changelog.i";
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44 // String filename = "store/data/hello.c.i";
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45 // String filename = "store/data/docs/readme.i";
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46 boolean dumpData = true;
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47 if (args.length > 1) {
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48 repo = args[0];
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49 filename = args[1];
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50 dumpData = args.length > 2 ? "dumpData".equals(args[2]) : false;
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51 }
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52 //
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53 DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File(repo + filename))));
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54 DataInput di = dis;
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55 dis.mark(10);
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56 int versionField = di.readInt();
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57 dis.reset();
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58 final int INLINEDATA = 1 << 16;
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59
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60 boolean inlineData = (versionField & INLINEDATA) != 0;
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61 System.out.printf("%#8x, inline: %b\n", versionField, inlineData);
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62 System.out.println("Index Offset Flags Packed Actual Base Rev Link Rev Parent1 Parent2 nodeid");
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63 int entryCount = 0;
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64 while (dis.available() > 0) {
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65 long l = di.readLong();
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66 long offset = l >>> 16;
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67 int flags = (int) (l & 0X0FFFF);
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68 int compressedLen = di.readInt();
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69 int actualLen = di.readInt();
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70 int baseRevision = di.readInt();
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71 int linkRevision = di.readInt();
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72 int parent1Revision = di.readInt();
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73 int parent2Revision = di.readInt();
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74 byte[] buf = new byte[32];
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75 di.readFully(buf, 12, 20);
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76 dis.skipBytes(12);
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77 // CAN'T USE skip() here without extra precautions. E.g. I ran into situation when
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78 // buffer was 8192 and BufferedInputStream was at position 8182 before attempt to skip(12).
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79 // BIS silently skips available bytes and leaves me two extra bytes that ruin the rest of the code.
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80 System.out.printf("%4d:%14d %6X %10d %10d %10d %10d %8d %8d %040x\n", entryCount, offset, flags, compressedLen, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, new BigInteger(buf));
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81 if (inlineData) {
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82 String resultString;
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83 byte[] data = new byte[compressedLen];
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84 di.readFully(data);
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85 if (data[0] == 0x78 /* 'x' */) {
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86 Inflater zlib = new Inflater();
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87 zlib.setInput(data, 0, compressedLen);
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88 byte[] result = new byte[actualLen*2];
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89 int resultLen = zlib.inflate(result);
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90 zlib.end();
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91 resultString = new String(result, 0, resultLen, "UTF-8");
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92 } else if (data[0] == 0x75 /* 'u' */) {
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93 resultString = new String(data, 1, data.length - 1, "UTF-8");
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94 } else {
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95 resultString = new String(data);
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96 }
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97 if (dumpData) {
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98 System.out.println(resultString);
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99 }
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100 }
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101 entryCount++;
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102 }
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103 dis.close();
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104 //
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105 }
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106 }