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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 299870249a28
children 909306e412e2
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.SessionContext;
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27 import org.tmatesoft.hg.util.LogFacility;
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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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43
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44 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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45 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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46 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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48 private final int mapioMagicBoundary;
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49 private final int bufferSize;
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50 private final SessionContext context;
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51
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52 public DataAccessProvider(SessionContext ctx) {
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53 this(ctx, getConfigOption(ctx, CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT), getConfigOption(ctx, CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER));
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54 }
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56 private static int getConfigOption(SessionContext ctx, String optName, int defaultValue) {
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57 Object v = ctx.getProperty(optName, defaultValue);
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58 if (false == v instanceof Number) {
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59 v = Integer.parseInt(v.toString());
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60 }
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61 return ((Number) v).intValue();
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62 }
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63
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64 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) {
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65 context = ctx;
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66 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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67 bufferSize = regularBufferSize;
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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 int mapioBufSize = getConfigOption(context, CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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80 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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81 } else {
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82 // XXX once implementation is more or less stable,
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83 // may want to try ByteBuffer.allocateDirect() to see
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84 // if there's any performance gain.
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85 boolean useDirectBuffer = false; // XXX might be another config option
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86 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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87 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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88 }
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89 } catch (IOException ex) {
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90 // unlikely to happen, we've made sure file exists.
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91 context.getLog().error(getClass(), ex, null);
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92 }
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93 return new DataAccess(); // non-null, empty.
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94 }
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96 private static class MemoryMapFileAccess extends DataAccess {
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97 private FileChannel fileChannel;
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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 MappedByteBuffer buffer;
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100 private final long size;
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101 private final int memBufferSize;
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102 private final LogFacility logFacility;
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103
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104 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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105 fileChannel = fc;
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106 size = channelSize;
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107 logFacility = log;
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108 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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109 }
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110
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111 @Override
26
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112 public boolean isEmpty() {
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113 return position + (buffer == null ? 0 : buffer.position()) >= size;
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114 }
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115
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116 @Override
420
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diff changeset
117 public DataAccess reset() throws IOException {
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118 longSeek(0);
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119 return this;
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120 }
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121
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122 @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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123 public int length() {
420
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124 return Internals.ltoi(longLength());
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125 }
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126
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127 @Override
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128 public long longLength() {
51
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129 return size;
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130 }
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131
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132 @Override
420
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133 public void longSeek(long offset) {
26
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134 assert offset >= 0;
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135 // offset may not necessarily be further than current position in the file (e.g. rewind)
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136 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
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137 // cast is ok according to check above
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138 buffer.position(Internals.ltoi(offset - position));
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139 } else {
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140 position = offset;
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141 buffer = null;
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142 }
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143 }
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144
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145 @Override
420
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146 public void seek(int offset) {
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147 longSeek(offset);
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148 }
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149
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150 @Override
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151 public void skip(int bytes) throws IOException {
26
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152 assert bytes >= 0;
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153 if (buffer == null) {
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154 position += bytes;
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155 return;
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156 }
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157 if (buffer.remaining() > bytes) {
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158 buffer.position(buffer.position() + bytes);
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159 } else {
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160 position += buffer.position() + bytes;
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161 buffer = null;
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162 }
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163 }
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164
26
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165 private void fill() throws IOException {
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166 if (buffer != null) {
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167 position += buffer.position();
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168 }
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169 long left = size - position;
440
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170 for (int i = 0; i < 3; i++) {
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171 try {
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172 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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173 return;
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174 } catch (IOException ex) {
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175 if (i == 2) {
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176 throw ex;
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177 }
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178 if (i == 0) {
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179 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
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180 logFacility.warn(getClass(), ex, "Memory-map failed, gonna try gc() to free virtual memory");
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181 }
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182 try {
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183 buffer = null;
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184 System.gc();
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185 Thread.sleep((1+i) * 1000);
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186 } catch (Throwable t) {
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187 logFacility.error(getClass(), t, "Bad luck");
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188 }
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189 }
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190 }
26
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191 }
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192
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193 @Override
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194 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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195 if (buffer == null || !buffer.hasRemaining()) {
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196 fill();
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197 }
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198 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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199 while (length > 0) {
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200 int tail = buffer.remaining();
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201 if (tail == 0) {
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202 throw new IOException();
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203 }
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204 if (tail >= length) {
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205 buffer.get(buf, offset, length);
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206 } else {
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207 buffer.get(buf, offset, tail);
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208 fill();
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diff changeset
209 }
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210 offset += tail;
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diff changeset
211 length -= tail;
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diff changeset
212 }
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diff changeset
213 }
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diff changeset
214
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diff changeset
215 @Override
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diff changeset
216 public byte readByte() throws IOException {
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diff changeset
217 if (buffer == null || !buffer.hasRemaining()) {
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diff changeset
218 fill();
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diff changeset
219 }
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diff changeset
220 if (buffer.hasRemaining()) {
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diff changeset
221 return buffer.get();
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diff changeset
222 }
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diff changeset
223 throw new IOException();
10
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224 }
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225
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226 @Override
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227 public void done() {
26
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228 buffer = null;
10
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229 if (fileChannel != null) {
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230 try {
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231 fileChannel.close();
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232 } catch (IOException ex) {
425
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233 logFacility.debug(getClass(), ex, null);
10
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234 }
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235 fileChannel = null;
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236 }
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237 }
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238 }
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239
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240 // (almost) regular file access - FileChannel and buffers.
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241 private static class FileAccess extends DataAccess {
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242 private FileChannel fileChannel;
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243 private ByteBuffer buffer;
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244 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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245 private final long size;
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246 private final LogFacility logFacility;
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247
425
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248 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
10
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249 fileChannel = fc;
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250 size = channelSize;
425
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251 logFacility = log;
420
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252 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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253 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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254 buffer.flip(); // or .limit(0) to indicate it's empty
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255 }
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256
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257 @Override
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258 public boolean isEmpty() {
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259 return bufferStartInFile + buffer.position() >= size;
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260 }
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261
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262 @Override
420
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263 public DataAccess reset() throws IOException {
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264 longSeek(0);
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265 return this;
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266 }
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267
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268 @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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269 public int length() {
420
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270 return Internals.ltoi(longLength());
51
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271 }
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272
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273 @Override
420
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274 public long longLength() {
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275 return size;
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276 }
420
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277
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278 @Override
420
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279 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
280 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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281 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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282 }
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283 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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284 // cast to int is safe, we've checked we fit into buffer
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285 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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286 } else {
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287 // out of current buffer, invalidate it (force re-read)
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288 // XXX or ever re-read it right away?
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289 bufferStartInFile = offset;
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290 buffer.clear();
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291 buffer.limit(0); // or .flip() to indicate we switch to reading
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292 fileChannel.position(offset);
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293 }
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294 }
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295
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296 @Override
420
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297 public void seek(int offset) throws IOException {
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298 longSeek(offset);
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299 }
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300
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301 @Override
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302 public void skip(int bytes) throws IOException {
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303 final int newPos = buffer.position() + bytes;
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304 if (newPos >= 0 && newPos < buffer.limit()) {
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305 // no need to move file pointer, just rewind/seek buffer
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306 buffer.position(newPos);
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diff changeset
307 } else {
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diff changeset
308 //
420
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diff changeset
309 longSeek(bufferStartInFile + newPos);
10
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310 }
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311 }
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312
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313 private boolean fill() throws IOException {
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diff changeset
314 if (!buffer.hasRemaining()) {
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315 bufferStartInFile += buffer.limit();
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316 buffer.clear();
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317 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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318 fileChannel.read(buffer);
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319 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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320 }
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321 buffer.flip();
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322 }
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323 return buffer.hasRemaining();
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diff changeset
324 }
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325
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diff changeset
326 @Override
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diff changeset
327 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
328 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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diff changeset
329 fill();
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diff changeset
330 }
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diff changeset
331 while (length > 0) {
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diff changeset
332 int tail = buffer.remaining();
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diff changeset
333 if (tail == 0) {
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diff changeset
334 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
335 }
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 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
337 buffer.get(buf, offset, length);
10
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diff changeset
338 } else {
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
339 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
340 fill();
10
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diff changeset
341 }
26
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diff changeset
342 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
343 length -= tail;
10
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diff changeset
344 }
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diff changeset
345 }
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346
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diff changeset
347 @Override
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diff changeset
348 public byte readByte() throws IOException {
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diff changeset
349 if (buffer.hasRemaining()) {
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diff changeset
350 return buffer.get();
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diff changeset
351 }
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diff changeset
352 if (fill()) {
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353 return buffer.get();
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354 }
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355 throw new IOException();
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356 }
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357
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358 @Override
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359 public void done() {
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360 if (buffer != null) {
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361 buffer = null;
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362 }
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363 if (fileChannel != null) {
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364 try {
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365 fileChannel.close();
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366 } catch (IOException ex) {
425
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367 logFacility.debug(getClass(), ex, null);
10
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368 }
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369 fileChannel = null;
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370 }
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371 }
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372 }
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373 }