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annotate src/org/tmatesoft/hg/internal/RevlogCompressor.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
parents 243202f1bda5
children 7c0d2ce340b8
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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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19 import java.io.IOException;
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20 import java.util.zip.Deflater;
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22 import org.tmatesoft.hg.core.SessionContext;
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23 import org.tmatesoft.hg.util.LogFacility.Severity;
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25 /**
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26 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public class RevlogCompressor {
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31 private final SessionContext ctx;
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32 private final Deflater zip;
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33 private DataSerializer.DataSource sourceData;
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34 private int compressedLen;
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35
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36 public RevlogCompressor(SessionContext sessionCtx) {
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37 ctx = sessionCtx;
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38 zip = new Deflater();
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39 }
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40
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41 public void reset(DataSerializer.DataSource source) {
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42 sourceData = source;
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43 compressedLen = -1;
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44 }
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45
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46 // out stream is not closed!
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47 public int writeCompressedData(DataSerializer out) throws IOException {
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48 zip.reset();
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49 DeflaterDataSerializer dds = new DeflaterDataSerializer(out, zip, sourceData.serializeLength());
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50 sourceData.serialize(dds);
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51 dds.finish();
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52 return zip.getTotalOut();
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53 }
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54
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55 public int getCompressedLength() {
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56 if (compressedLen != -1) {
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57 return compressedLen;
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58 }
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59 Counter counter = new Counter();
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60 try {
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61 compressedLen = writeCompressedData(counter);
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62 assert counter.totalWritten == compressedLen;
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63 return compressedLen;
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64 } catch (IOException ex) {
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65 // can't happen provided we write to our stream that does nothing but byte counting
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66 ctx.getLog().dump(getClass(), Severity.Error, ex, "Failed estimating compressed length of revlog data");
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67 return counter.totalWritten; // use best known value so far
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68 }
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69 }
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71 private static class Counter extends DataSerializer {
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72 public int totalWritten = 0;
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73
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74 public void writeByte(byte... values) throws IOException {
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75 totalWritten += values.length;
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76 }
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78 public void writeInt(int... values) throws IOException {
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79 totalWritten += 4 * values.length;
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80 }
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82 public void write(byte[] data, int offset, int length) throws IOException {
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83 totalWritten += length;
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84 }
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85 }
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86 }