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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 497:02140be396d5

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Issue 38. Towards gentle handling of config files - parse them and keep every possible user change
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 25 Oct 2012 19:59:08 +0200
parents 2743641f2f12
children 243202f1bda5
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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 = mapioBoundaryValue(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 = mapioBoundaryValue(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 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
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71 private static int mapioBoundaryValue(int mapioBoundary) {
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72 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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73 }
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75 public DataAccess create(File f) {
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76 if (!f.exists()) {
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77 return new DataAccess();
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78 }
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79 try {
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80 FileChannel fc = new FileInputStream(f).getChannel();
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81 long flen = fc.size();
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82 if (flen > mapioMagicBoundary) {
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83 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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84 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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85 } else {
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86 // XXX once implementation is more or less stable,
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87 // may want to try ByteBuffer.allocateDirect() to see
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88 // if there's any performance gain.
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89 boolean useDirectBuffer = false; // XXX might be another config option
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90 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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91 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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92 }
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93 } catch (IOException ex) {
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94 // unlikely to happen, we've made sure file exists.
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95 context.getLog().dump(getClass(), Error, ex, null);
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96 }
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97 return new DataAccess(); // non-null, empty.
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98 }
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99
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100 private static class MemoryMapFileAccess extends DataAccess {
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101 private FileChannel fileChannel;
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102 private long position = 0; // always points to buffer's absolute position in the file
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103 private MappedByteBuffer buffer;
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104 private final long size;
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105 private final int memBufferSize;
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106 private final LogFacility logFacility;
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107
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108 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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109 fileChannel = fc;
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diff changeset
110 size = channelSize;
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48f993aa2f41 FIXMEs: exceptions, javadoc
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111 logFacility = log;
420
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112 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
10
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113 }
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114
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115 @Override
26
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116 public boolean isEmpty() {
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117 return position + (buffer == null ? 0 : buffer.position()) >= size;
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118 }
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119
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120 @Override
420
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121 public DataAccess reset() throws IOException {
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122 longSeek(0);
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123 return this;
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124 }
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125
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126 @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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127 public int length() {
420
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128 return Internals.ltoi(longLength());
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129 }
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130
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131 @Override
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132 public long longLength() {
51
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133 return size;
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134 }
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135
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136 @Override
420
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137 public void longSeek(long offset) {
26
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138 assert offset >= 0;
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139 // offset may not necessarily be further than current position in the file (e.g. rewind)
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140 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
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141 // cast is ok according to check above
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142 buffer.position(Internals.ltoi(offset - position));
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143 } else {
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144 position = offset;
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145 buffer = null;
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146 }
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147 }
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148
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149 @Override
420
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150 public void seek(int offset) {
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151 longSeek(offset);
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152 }
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153
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154 @Override
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155 public void skip(int bytes) throws IOException {
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156 assert bytes >= 0;
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157 if (buffer == null) {
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158 position += bytes;
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159 return;
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160 }
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161 if (buffer.remaining() > bytes) {
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162 buffer.position(buffer.position() + bytes);
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163 } else {
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164 position += buffer.position() + bytes;
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165 buffer = null;
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166 }
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167 }
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168
26
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169 private void fill() throws IOException {
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170 if (buffer != null) {
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171 position += buffer.position();
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172 }
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173 long left = size - position;
440
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174 for (int i = 0; i < 3; i++) {
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175 try {
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176 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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177 return;
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178 } catch (IOException ex) {
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179 if (i == 2) {
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180 throw ex;
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181 }
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182 if (i == 0) {
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183 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
456
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184 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
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185 }
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186 try {
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187 buffer = null;
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188 System.gc();
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189 Thread.sleep((1+i) * 1000);
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190 } catch (Throwable t) {
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191 logFacility.dump(getClass(), Error, t, "Bad luck");
440
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192 }
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193 }
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194 }
26
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195 }
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196
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197 @Override
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198 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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199 if (buffer == null || !buffer.hasRemaining()) {
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200 fill();
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201 }
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202 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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203 while (length > 0) {
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204 int tail = buffer.remaining();
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205 if (tail == 0) {
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206 throw new IOException();
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207 }
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208 if (tail >= length) {
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diff changeset
209 buffer.get(buf, offset, length);
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210 } else {
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211 buffer.get(buf, offset, tail);
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212 fill();
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213 }
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diff changeset
214 offset += tail;
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diff changeset
215 length -= tail;
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diff changeset
216 }
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diff changeset
217 }
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diff changeset
218
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diff changeset
219 @Override
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diff changeset
220 public byte readByte() throws IOException {
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diff changeset
221 if (buffer == null || !buffer.hasRemaining()) {
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diff changeset
222 fill();
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diff changeset
223 }
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diff changeset
224 if (buffer.hasRemaining()) {
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diff changeset
225 return buffer.get();
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diff changeset
226 }
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diff changeset
227 throw new IOException();
10
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228 }
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229
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230 @Override
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231 public void done() {
26
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232 buffer = null;
10
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233 if (fileChannel != null) {
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234 try {
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235 fileChannel.close();
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236 } catch (IOException ex) {
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237 logFacility.dump(getClass(), Warn, ex, null);
10
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238 }
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239 fileChannel = null;
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240 }
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241 }
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242 }
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243
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244 // (almost) regular file access - FileChannel and buffers.
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245 private static class FileAccess extends DataAccess {
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246 private FileChannel fileChannel;
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247 private ByteBuffer buffer;
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248 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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249 private final long size;
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250 private final LogFacility logFacility;
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251
425
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252 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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253 fileChannel = fc;
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254 size = channelSize;
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255 logFacility = log;
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256 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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257 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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258 buffer.flip(); // or .limit(0) to indicate it's empty
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259 }
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260
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261 @Override
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262 public boolean isEmpty() {
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263 return bufferStartInFile + buffer.position() >= size;
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264 }
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265
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266 @Override
420
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267 public DataAccess reset() throws IOException {
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268 longSeek(0);
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269 return this;
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270 }
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271
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272 @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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273 public int length() {
420
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274 return Internals.ltoi(longLength());
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275 }
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276
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277 @Override
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278 public long longLength() {
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279 return size;
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280 }
420
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281
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282 @Override
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283 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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284 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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285 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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286 }
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287 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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288 // cast to int is safe, we've checked we fit into buffer
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289 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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290 } else {
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291 // out of current buffer, invalidate it (force re-read)
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292 // XXX or ever re-read it right away?
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293 bufferStartInFile = offset;
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294 buffer.clear();
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295 buffer.limit(0); // or .flip() to indicate we switch to reading
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296 fileChannel.position(offset);
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297 }
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298 }
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299
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300 @Override
420
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301 public void seek(int offset) throws IOException {
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302 longSeek(offset);
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303 }
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304
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305 @Override
10
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306 public void skip(int bytes) throws IOException {
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307 final int newPos = buffer.position() + bytes;
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308 if (newPos >= 0 && newPos < buffer.limit()) {
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309 // no need to move file pointer, just rewind/seek buffer
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310 buffer.position(newPos);
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311 } else {
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312 //
420
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diff changeset
313 longSeek(bufferStartInFile + newPos);
10
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314 }
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315 }
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316
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317 private boolean fill() throws IOException {
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318 if (!buffer.hasRemaining()) {
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319 bufferStartInFile += buffer.limit();
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320 buffer.clear();
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321 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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322 fileChannel.read(buffer);
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323 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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324 }
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325 buffer.flip();
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326 }
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327 return buffer.hasRemaining();
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328 }
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329
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330 @Override
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331 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
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diff changeset
332 if (!buffer.hasRemaining()) {
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diff changeset
333 fill();
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diff changeset
334 }
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diff changeset
335 while (length > 0) {
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diff changeset
336 int tail = buffer.remaining();
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diff changeset
337 if (tail == 0) {
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diff changeset
338 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
339 }
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diff changeset
340 if (tail >= length) {
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diff changeset
341 buffer.get(buf, offset, length);
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342 } else {
26
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diff changeset
343 buffer.get(buf, offset, tail);
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diff changeset
344 fill();
10
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345 }
26
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diff changeset
346 offset += tail;
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diff changeset
347 length -= tail;
10
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diff changeset
348 }
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349 }
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350
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351 @Override
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diff changeset
352 public byte readByte() throws IOException {
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diff changeset
353 if (buffer.hasRemaining()) {
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354 return buffer.get();
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355 }
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356 if (fill()) {
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357 return buffer.get();
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358 }
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359 throw new IOException();
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360 }
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361
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362 @Override
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363 public void done() {
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364 if (buffer != null) {
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365 buffer = null;
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366 }
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367 if (fileChannel != null) {
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368 try {
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369 fileChannel.close();
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370 } catch (IOException ex) {
456
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371 logFacility.dump(getClass(), Warn, ex, null);
10
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372 }
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373 fileChannel = null;
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374 }
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375 }
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376 }
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377 }