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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 457:d78cb5ca3053

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Get rid of ambiguity in method name
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 18 Jun 2012 17:06:42 +0200
parents 909306e412e2
children 2743641f2f12
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1 /*
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2 * Copyright (c) 2010-2012 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 static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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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.io.IOException;
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25 import java.nio.ByteBuffer;
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26 import java.nio.MappedByteBuffer;
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27 import java.nio.channels.FileChannel;
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29 import org.tmatesoft.hg.core.SessionContext;
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30 import org.tmatesoft.hg.util.LogFacility;
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32 /**
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class DataAccessProvider {
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38 /**
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39 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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40 * Set to 0 to indicate mapping files into memory shall not be used.
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41 * If set to -1, file of any size would be mapped in memory.
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42 */
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43 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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44 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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45 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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47 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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48 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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49 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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51 private final int mapioMagicBoundary;
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52 private final int bufferSize, mapioBufSize;
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53 private final SessionContext context;
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54
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55 public DataAccessProvider(SessionContext ctx) {
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56 context = ctx;
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57 PropertyMarshal pm = new PropertyMarshal(ctx);
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58 mapioMagicBoundary = pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT);
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59 bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
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60 mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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61 }
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63 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
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64 context = ctx;
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65 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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66 bufferSize = regularBufferSize;
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67 mapioBufSize = mapioBufferSize;
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68 }
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70 public DataAccess create(File f) {
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71 if (!f.exists()) {
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72 return new DataAccess();
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73 }
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74 try {
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75 FileChannel fc = new FileInputStream(f).getChannel();
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76 long flen = fc.size();
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77 if (flen > mapioMagicBoundary) {
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78 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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79 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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80 } else {
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81 // XXX once implementation is more or less stable,
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82 // may want to try ByteBuffer.allocateDirect() to see
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83 // if there's any performance gain.
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84 boolean useDirectBuffer = false; // XXX might be another config option
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85 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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86 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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87 }
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88 } catch (IOException ex) {
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89 // unlikely to happen, we've made sure file exists.
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90 context.getLog().dump(getClass(), Error, ex, null);
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91 }
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92 return new DataAccess(); // non-null, empty.
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93 }
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95 private static class MemoryMapFileAccess extends DataAccess {
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96 private FileChannel fileChannel;
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97 private long position = 0; // always points to buffer's absolute position in the file
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98 private MappedByteBuffer buffer;
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99 private final long size;
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100 private final int memBufferSize;
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101 private final LogFacility logFacility;
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102
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103 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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104 fileChannel = fc;
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105 size = channelSize;
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106 logFacility = log;
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107 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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108 }
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110 @Override
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diff changeset
111 public boolean isEmpty() {
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diff changeset
112 return position + (buffer == null ? 0 : buffer.position()) >= size;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
113 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
114
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
115 @Override
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
116 public DataAccess reset() throws IOException {
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
117 longSeek(0);
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
118 return this;
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
119 }
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
120
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 414
diff changeset
121 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 157
diff changeset
122 public int length() {
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
123 return Internals.ltoi(longLength());
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
124 }
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diff changeset
125
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 414
diff changeset
126 @Override
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
127 public long longLength() {
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
128 return size;
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diff changeset
129 }
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
130
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
131 @Override
420
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
132 public void longSeek(long offset) {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
133 assert offset >= 0;
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diff changeset
134 // offset may not necessarily be further than current position in the file (e.g. rewind)
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
135 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
136 // cast is ok according to check above
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
137 buffer.position(Internals.ltoi(offset - position));
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
138 } else {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
139 position = offset;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
140 buffer = null;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
141 }
10
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142 }
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diff changeset
143
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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144 @Override
420
6c22bdc0bdfd Respect long offsets in revlogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 414
diff changeset
145 public void seek(int offset) {
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
146 longSeek(offset);
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
147 }
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diff changeset
148
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diff changeset
149 @Override
10
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150 public void skip(int bytes) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
151 assert bytes >= 0;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
152 if (buffer == null) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
153 position += bytes;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
154 return;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
155 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
156 if (buffer.remaining() > bytes) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
157 buffer.position(buffer.position() + bytes);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
158 } else {
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diff changeset
159 position += buffer.position() + bytes;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
160 buffer = null;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
161 }
10
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diff changeset
162 }
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diff changeset
163
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
164 private void fill() throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
165 if (buffer != null) {
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diff changeset
166 position += buffer.position();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
167 }
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
168 long left = size - position;
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
169 for (int i = 0; i < 3; i++) {
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
170 try {
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
171 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
172 return;
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
173 } catch (IOException ex) {
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
174 if (i == 2) {
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
175 throw ex;
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parents: 425
diff changeset
176 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
177 if (i == 0) {
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
178 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
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parents: 440
diff changeset
179 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
180 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
181 try {
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
182 buffer = null;
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
183 System.gc();
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
184 Thread.sleep((1+i) * 1000);
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
185 } catch (Throwable t) {
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 440
diff changeset
186 logFacility.dump(getClass(), Error, t, "Bad luck");
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
187 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
188 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 425
diff changeset
189 }
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
190 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
191
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
192 @Override
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diff changeset
193 public void readBytes(byte[] buf, int offset, int length) throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
194 if (buffer == null || !buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
195 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
196 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
197 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
198 while (length > 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
199 int tail = buffer.remaining();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
200 if (tail == 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
201 throw new IOException();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
202 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
203 if (tail >= length) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
204 buffer.get(buf, offset, length);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
205 } else {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
206 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
207 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
208 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
209 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
210 length -= tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
211 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
212 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
213
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
214 @Override
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
215 public byte readByte() throws IOException {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
216 if (buffer == null || !buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
217 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
218 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
219 if (buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
220 return buffer.get();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
221 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
222 throw new IOException();
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
223 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
224
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
225 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
226 public void done() {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
227 buffer = null;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
228 if (fileChannel != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
229 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
230 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
231 } catch (IOException ex) {
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 440
diff changeset
232 logFacility.dump(getClass(), Warn, ex, null);
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233 }
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234 fileChannel = null;
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235 }
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236 }
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237 }
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238
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239 // (almost) regular file access - FileChannel and buffers.
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240 private static class FileAccess extends DataAccess {
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241 private FileChannel fileChannel;
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242 private ByteBuffer buffer;
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243 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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244 private final long size;
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245 private final LogFacility logFacility;
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246
425
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247 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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248 fileChannel = fc;
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249 size = channelSize;
425
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250 logFacility = log;
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251 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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252 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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253 buffer.flip(); // or .limit(0) to indicate it's empty
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254 }
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255
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256 @Override
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257 public boolean isEmpty() {
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258 return bufferStartInFile + buffer.position() >= size;
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259 }
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260
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261 @Override
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262 public DataAccess reset() throws IOException {
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263 longSeek(0);
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264 return this;
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265 }
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266
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267 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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268 public int length() {
420
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269 return Internals.ltoi(longLength());
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270 }
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271
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272 @Override
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273 public long longLength() {
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274 return size;
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275 }
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276
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277 @Override
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278 public void longSeek(long offset) throws IOException {
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279 if (offset > size) {
404
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280 throw new IllegalArgumentException(String.format("Can't seek to %d for the file of size %d (buffer start:%d)", offset, size, bufferStartInFile));
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281 }
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282 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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283 // cast to int is safe, we've checked we fit into buffer
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284 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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285 } else {
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286 // out of current buffer, invalidate it (force re-read)
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287 // XXX or ever re-read it right away?
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288 bufferStartInFile = offset;
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289 buffer.clear();
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290 buffer.limit(0); // or .flip() to indicate we switch to reading
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291 fileChannel.position(offset);
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292 }
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293 }
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294
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295 @Override
420
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296 public void seek(int offset) throws IOException {
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297 longSeek(offset);
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298 }
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299
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300 @Override
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301 public void skip(int bytes) throws IOException {
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302 final int newPos = buffer.position() + bytes;
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303 if (newPos >= 0 && newPos < buffer.limit()) {
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304 // no need to move file pointer, just rewind/seek buffer
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305 buffer.position(newPos);
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306 } else {
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diff changeset
307 //
420
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diff changeset
308 longSeek(bufferStartInFile + newPos);
10
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309 }
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310 }
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311
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312 private boolean fill() throws IOException {
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313 if (!buffer.hasRemaining()) {
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314 bufferStartInFile += buffer.limit();
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315 buffer.clear();
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316 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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317 fileChannel.read(buffer);
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318 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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319 }
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320 buffer.flip();
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321 }
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322 return buffer.hasRemaining();
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323 }
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324
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325 @Override
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diff changeset
326 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
327 if (!buffer.hasRemaining()) {
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diff changeset
328 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
329 }
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diff changeset
330 while (length > 0) {
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diff changeset
331 int tail = buffer.remaining();
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diff changeset
332 if (tail == 0) {
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diff changeset
333 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
334 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
335 if (tail >= length) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
336 buffer.get(buf, offset, length);
10
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diff changeset
337 } else {
26
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diff changeset
338 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
339 fill();
10
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diff changeset
340 }
26
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diff changeset
341 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
342 length -= tail;
10
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diff changeset
343 }
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diff changeset
344 }
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345
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diff changeset
346 @Override
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diff changeset
347 public byte readByte() throws IOException {
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diff changeset
348 if (buffer.hasRemaining()) {
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diff changeset
349 return buffer.get();
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diff changeset
350 }
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diff changeset
351 if (fill()) {
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diff changeset
352 return buffer.get();
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diff changeset
353 }
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diff changeset
354 throw new IOException();
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diff changeset
355 }
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356
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357 @Override
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358 public void done() {
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359 if (buffer != null) {
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360 buffer = null;
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361 }
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362 if (fileChannel != null) {
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363 try {
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364 fileChannel.close();
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365 } catch (IOException ex) {
456
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366 logFacility.dump(getClass(), Warn, ex, null);
10
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367 }
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368 fileChannel = null;
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369 }
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370 }
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371 }
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372 }