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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 981f9f50bb6c
children 0ae53c32ecef 31a719b9f95e
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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19 import java.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.nio.MappedByteBuffer;
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24 import java.nio.channels.FileChannel;
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.SessionContext;
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28
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29 /**
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class DataAccessProvider {
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35 /**
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36 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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37 * Set to 0 to indicate mapping files into memory shall not be used.
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38 * If set to -1, file of any size would be mapped in memory.
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39 */
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40 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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41 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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42 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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44 private final int mapioMagicBoundary;
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45 private final int bufferSize;
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46 private final SessionContext context;
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47
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48 public DataAccessProvider(SessionContext ctx) {
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49 this(ctx, getConfigOption(ctx, CFG_PROPERTY_MAPIO_LIMIT, 100 * 1024), getConfigOption(ctx, CFG_PROPERTY_FILE_BUFFER_SIZE, 8 * 1024));
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50 }
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51
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52 private static int getConfigOption(SessionContext ctx, String optName, int defaultValue) {
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53 Object v = ctx.getProperty(optName, defaultValue);
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54 if (false == v instanceof Number) {
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55 v = Integer.parseInt(v.toString());
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56 }
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57 return ((Number) v).intValue();
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58 }
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59
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60 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) {
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61 context = ctx;
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62 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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63 bufferSize = regularBufferSize;
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64 }
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66 public DataAccess create(File f) {
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67 if (!f.exists()) {
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68 return new DataAccess();
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69 }
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70 try {
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71 FileChannel fc = new FileInputStream(f).getChannel();
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72 int flen = (int) fc.size();
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73 if (fc.size() - flen != 0) {
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74 throw new HgBadStateException("Files greater than 2Gb are not yet supported");
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75 }
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76 if (flen > mapioMagicBoundary) {
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77 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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78 return new MemoryMapFileAccess(fc, flen, getConfigOption(context, CFG_PROPERTY_MAPIO_BUFFER_SIZE, 100*1024 /*same as default boundary*/));
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79 } else {
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80 // XXX once implementation is more or less stable,
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81 // may want to try ByteBuffer.allocateDirect() to see
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82 // if there's any performance gain.
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83 boolean useDirectBuffer = false; // XXX might be another config option
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84 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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85 return new FileAccess(fc, flen, bufferSize, useDirectBuffer);
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86 }
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87 } catch (IOException ex) {
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88 // unlikely to happen, we've made sure file exists.
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89 context.getLog().error(getClass(), ex, null);
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90 }
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91 return new DataAccess(); // non-null, empty.
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92 }
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93
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94 // DOESN'T WORK YET
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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 final int size;
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98 private long position = 0; // always points to buffer's absolute position in the file
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99 private final int memBufferSize;
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100 private MappedByteBuffer buffer;
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101
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102 public MemoryMapFileAccess(FileChannel fc, int channelSize, int bufferSize) {
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103 fileChannel = fc;
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104 size = channelSize;
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105 memBufferSize = bufferSize > channelSize ? channelSize : bufferSize; // no reason to waste memory more than there's data
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106 }
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107
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108 @Override
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109 public boolean isEmpty() {
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110 return position + (buffer == null ? 0 : buffer.position()) >= size;
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111 }
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112
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113 @Override
158
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114 public int length() {
51
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115 return size;
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116 }
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117
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118 @Override
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119 public DataAccess reset() throws IOException {
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120 seek(0);
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121 return this;
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122 }
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123
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124 @Override
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125 public void seek(int offset) {
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126 assert offset >= 0;
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127 // offset may not necessarily be further than current position in the file (e.g. rewind)
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128 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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129 buffer.position((int) (offset - position));
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130 } else {
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131 position = offset;
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132 buffer = null;
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133 }
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134 }
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135
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136 @Override
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137 public void skip(int bytes) throws IOException {
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138 assert bytes >= 0;
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139 if (buffer == null) {
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140 position += bytes;
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141 return;
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142 }
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143 if (buffer.remaining() > bytes) {
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144 buffer.position(buffer.position() + bytes);
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145 } else {
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146 position += buffer.position() + bytes;
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147 buffer = null;
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148 }
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149 }
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150
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151 private void fill() throws IOException {
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152 if (buffer != null) {
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153 position += buffer.position();
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154 }
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155 long left = size - position;
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156 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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157 }
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158
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159 @Override
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160 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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161 if (buffer == null || !buffer.hasRemaining()) {
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162 fill();
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163 }
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164 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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165 while (length > 0) {
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166 int tail = buffer.remaining();
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167 if (tail == 0) {
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168 throw new IOException();
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169 }
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170 if (tail >= length) {
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171 buffer.get(buf, offset, length);
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172 } else {
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173 buffer.get(buf, offset, tail);
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174 fill();
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175 }
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176 offset += tail;
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177 length -= tail;
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178 }
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179 }
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180
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181 @Override
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182 public byte readByte() throws IOException {
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183 if (buffer == null || !buffer.hasRemaining()) {
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184 fill();
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185 }
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186 if (buffer.hasRemaining()) {
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187 return buffer.get();
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188 }
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189 throw new IOException();
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190 }
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191
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192 @Override
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193 public void done() {
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194 buffer = null;
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195 if (fileChannel != null) {
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196 try {
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197 fileChannel.close();
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198 } catch (IOException ex) {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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199 StreamLogFacility.newDefault().debug(getClass(), ex, null);
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200 }
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201 fileChannel = null;
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202 }
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203 }
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204 }
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205
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206 // (almost) regular file access - FileChannel and buffers.
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207 private static class FileAccess extends DataAccess {
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208 private FileChannel fileChannel;
158
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209 private final int size;
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210 private ByteBuffer buffer;
158
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211 private int bufferStartInFile = 0; // offset of this.buffer in the file.
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212
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213 public FileAccess(FileChannel fc, int channelSize, int bufferSizeHint, boolean useDirect) {
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214 fileChannel = fc;
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215 size = channelSize;
158
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216 final int capacity = size < bufferSizeHint ? size : bufferSizeHint;
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217 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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218 buffer.flip(); // or .limit(0) to indicate it's empty
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219 }
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220
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221 @Override
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222 public boolean isEmpty() {
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223 return bufferStartInFile + buffer.position() >= size;
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224 }
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225
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226 @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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227 public int length() {
51
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228 return size;
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229 }
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230
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231 @Override
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232 public DataAccess reset() throws IOException {
51
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233 seek(0);
157
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234 return this;
51
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235 }
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236
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237 @Override
158
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238 public void seek(int offset) throws IOException {
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239 if (offset > size) {
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240 throw new IllegalArgumentException();
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241 }
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242 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
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243 buffer.position((int) (offset - bufferStartInFile));
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244 } else {
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245 // out of current buffer, invalidate it (force re-read)
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246 // XXX or ever re-read it right away?
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247 bufferStartInFile = offset;
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248 buffer.clear();
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249 buffer.limit(0); // or .flip() to indicate we switch to reading
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250 fileChannel.position(offset);
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251 }
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252 }
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253
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254 @Override
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255 public void skip(int bytes) throws IOException {
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256 final int newPos = buffer.position() + bytes;
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257 if (newPos >= 0 && newPos < buffer.limit()) {
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258 // no need to move file pointer, just rewind/seek buffer
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259 buffer.position(newPos);
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260 } else {
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261 //
23
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262 seek(bufferStartInFile + newPos);
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263 }
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264 }
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265
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266 private boolean fill() throws IOException {
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267 if (!buffer.hasRemaining()) {
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268 bufferStartInFile += buffer.limit();
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269 buffer.clear();
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270 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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271 fileChannel.read(buffer);
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272 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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273 }
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274 buffer.flip();
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275 }
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276 return buffer.hasRemaining();
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277 }
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278
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279 @Override
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280 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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281 if (!buffer.hasRemaining()) {
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282 fill();
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283 }
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284 while (length > 0) {
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285 int tail = buffer.remaining();
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286 if (tail == 0) {
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287 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
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288 }
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diff changeset
289 if (tail >= length) {
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diff changeset
290 buffer.get(buf, offset, length);
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291 } else {
26
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diff changeset
292 buffer.get(buf, offset, tail);
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diff changeset
293 fill();
10
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294 }
26
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diff changeset
295 offset += tail;
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diff changeset
296 length -= tail;
10
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297 }
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298 }
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299
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300 @Override
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301 public byte readByte() throws IOException {
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diff changeset
302 if (buffer.hasRemaining()) {
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diff changeset
303 return buffer.get();
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diff changeset
304 }
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diff changeset
305 if (fill()) {
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306 return buffer.get();
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diff changeset
307 }
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diff changeset
308 throw new IOException();
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diff changeset
309 }
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310
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diff changeset
311 @Override
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diff changeset
312 public void done() {
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diff changeset
313 if (buffer != null) {
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314 buffer = null;
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315 }
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diff changeset
316 if (fileChannel != null) {
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diff changeset
317 try {
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318 fileChannel.close();
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diff changeset
319 } catch (IOException ex) {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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parents: 158
diff changeset
320 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
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diff changeset
321 }
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diff changeset
322 fileChannel = null;
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diff changeset
323 }
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parents:
diff changeset
324 }
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parents:
diff changeset
325 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
326 }