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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 421:fdd7d756dea0 v0.8.5

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Allow IOException from DataAccess methods for subclasses with non-trivial implementations, to avoid exception dumps when inapropriate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 23:09:11 +0100
parents 6c22bdc0bdfd
children 48f993aa2f41
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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28 /**
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class DataAccessProvider {
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34 /**
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35 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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36 * Set to 0 to indicate mapping files into memory shall not be used.
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37 * If set to -1, file of any size would be mapped in memory.
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38 */
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39 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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40 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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41 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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43 private final int mapioMagicBoundary;
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44 private final int bufferSize;
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45 private final SessionContext context;
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46
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47 public DataAccessProvider(SessionContext ctx) {
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48 this(ctx, getConfigOption(ctx, CFG_PROPERTY_MAPIO_LIMIT, 100 * 1024), getConfigOption(ctx, CFG_PROPERTY_FILE_BUFFER_SIZE, 8 * 1024));
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49 }
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50
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51 private static int getConfigOption(SessionContext ctx, String optName, int defaultValue) {
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52 Object v = ctx.getProperty(optName, defaultValue);
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53 if (false == v instanceof Number) {
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54 v = Integer.parseInt(v.toString());
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55 }
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56 return ((Number) v).intValue();
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57 }
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58
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59 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize) {
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60 context = ctx;
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61 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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62 bufferSize = regularBufferSize;
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63 }
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64
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65 public DataAccess create(File f) {
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66 if (!f.exists()) {
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67 return new DataAccess();
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68 }
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69 try {
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70 FileChannel fc = new FileInputStream(f).getChannel();
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71 long flen = fc.size();
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72 if (flen > mapioMagicBoundary) {
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73 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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74 return new MemoryMapFileAccess(fc, flen, getConfigOption(context, CFG_PROPERTY_MAPIO_BUFFER_SIZE, 100*1024 /*same as default boundary*/));
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75 } else {
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76 // XXX once implementation is more or less stable,
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77 // may want to try ByteBuffer.allocateDirect() to see
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78 // if there's any performance gain.
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79 boolean useDirectBuffer = false; // XXX might be another config option
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80 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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81 return new FileAccess(fc, flen, bufferSize, useDirectBuffer);
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82 }
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83 } catch (IOException ex) {
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84 // unlikely to happen, we've made sure file exists.
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85 context.getLog().error(getClass(), ex, null);
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86 }
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87 return new DataAccess(); // non-null, empty.
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88 }
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89
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90 private static class MemoryMapFileAccess extends DataAccess {
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91 private FileChannel fileChannel;
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92 private final long size;
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93 private long position = 0; // always points to buffer's absolute position in the file
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94 private final int memBufferSize;
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95 private MappedByteBuffer buffer;
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96
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97 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize) {
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98 fileChannel = fc;
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99 size = channelSize;
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100 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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101 }
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102
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103 @Override
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104 public boolean isEmpty() {
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105 return position + (buffer == null ? 0 : buffer.position()) >= size;
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106 }
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107
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diff changeset
108 @Override
420
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109 public DataAccess reset() throws IOException {
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110 longSeek(0);
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111 return this;
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112 }
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113
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114 @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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115 public int length() {
420
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116 return Internals.ltoi(longLength());
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117 }
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118
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119 @Override
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120 public long longLength() {
51
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121 return size;
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122 }
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123
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124 @Override
420
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125 public void longSeek(long offset) {
26
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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()) {
420
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129 // cast is ok according to check above
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130 buffer.position(Internals.ltoi(offset - position));
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131 } else {
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132 position = offset;
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133 buffer = null;
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134 }
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135 }
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136
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137 @Override
420
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138 public void seek(int offset) {
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139 longSeek(offset);
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140 }
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141
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142 @Override
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143 public void skip(int bytes) throws IOException {
26
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144 assert bytes >= 0;
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145 if (buffer == null) {
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146 position += bytes;
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147 return;
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148 }
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149 if (buffer.remaining() > bytes) {
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150 buffer.position(buffer.position() + bytes);
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151 } else {
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152 position += buffer.position() + bytes;
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153 buffer = null;
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154 }
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155 }
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156
26
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157 private void fill() throws IOException {
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158 if (buffer != null) {
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159 position += buffer.position();
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160 }
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161 long left = size - position;
26
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162 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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163 }
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164
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165 @Override
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166 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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167 if (buffer == null || !buffer.hasRemaining()) {
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168 fill();
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169 }
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170 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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171 while (length > 0) {
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172 int tail = buffer.remaining();
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173 if (tail == 0) {
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174 throw new IOException();
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175 }
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176 if (tail >= length) {
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177 buffer.get(buf, offset, length);
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178 } else {
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179 buffer.get(buf, offset, tail);
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180 fill();
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181 }
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182 offset += tail;
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183 length -= tail;
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184 }
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185 }
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diff changeset
186
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187 @Override
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188 public byte readByte() throws IOException {
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189 if (buffer == null || !buffer.hasRemaining()) {
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190 fill();
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191 }
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diff changeset
192 if (buffer.hasRemaining()) {
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193 return buffer.get();
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194 }
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195 throw new IOException();
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196 }
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197
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198 @Override
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199 public void done() {
26
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200 buffer = null;
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201 if (fileChannel != null) {
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diff changeset
202 try {
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203 fileChannel.close();
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diff changeset
204 } catch (IOException ex) {
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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diff changeset
205 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
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206 }
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207 fileChannel = null;
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208 }
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209 }
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210 }
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211
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212 // (almost) regular file access - FileChannel and buffers.
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213 private static class FileAccess extends DataAccess {
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214 private FileChannel fileChannel;
420
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diff changeset
215 private final long size;
10
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216 private ByteBuffer buffer;
420
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diff changeset
217 private long bufferStartInFile = 0; // offset of this.buffer in the file.
10
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218
420
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diff changeset
219 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect) {
10
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220 fileChannel = fc;
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221 size = channelSize;
420
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diff changeset
222 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
10
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223 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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224 buffer.flip(); // or .limit(0) to indicate it's empty
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diff changeset
225 }
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226
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227 @Override
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diff changeset
228 public boolean isEmpty() {
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diff changeset
229 return bufferStartInFile + buffer.position() >= size;
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230 }
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231
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232 @Override
420
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
233 public DataAccess reset() throws IOException {
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
234 longSeek(0);
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diff changeset
235 return this;
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diff changeset
236 }
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237
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parents: 414
diff changeset
238 @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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diff changeset
239 public int length() {
420
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
240 return Internals.ltoi(longLength());
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 27
diff changeset
241 }
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242
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diff changeset
243 @Override
420
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diff changeset
244 public long longLength() {
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
245 return size;
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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parents: 27
diff changeset
246 }
420
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parents: 414
diff changeset
247
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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diff changeset
248 @Override
420
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diff changeset
249 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
250 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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diff changeset
251 throw new IllegalArgumentException(String.format("Can't seek to %d for the file of size %d (buffer start:%d)", offset, size, bufferStartInFile));
23
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diff changeset
252 }
10
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253 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
254 // cast to int is safe, we've checked we fit into buffer
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diff changeset
255 buffer.position(Internals.ltoi(offset - bufferStartInFile));
10
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256 } else {
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257 // out of current buffer, invalidate it (force re-read)
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258 // XXX or ever re-read it right away?
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259 bufferStartInFile = offset;
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260 buffer.clear();
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diff changeset
261 buffer.limit(0); // or .flip() to indicate we switch to reading
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262 fileChannel.position(offset);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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263 }
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parents:
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264 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
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265
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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266 @Override
420
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
267 public void seek(int offset) throws IOException {
6c22bdc0bdfd Respect long offsets in revlogs
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parents: 414
diff changeset
268 longSeek(offset);
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diff changeset
269 }
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diff changeset
270
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
271 @Override
10
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272 public void skip(int bytes) throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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273 final int newPos = buffer.position() + bytes;
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diff changeset
274 if (newPos >= 0 && newPos < buffer.limit()) {
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275 // no need to move file pointer, just rewind/seek buffer
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276 buffer.position(newPos);
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diff changeset
277 } else {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
278 //
420
6c22bdc0bdfd Respect long offsets in revlogs
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diff changeset
279 longSeek(bufferStartInFile + newPos);
10
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280 }
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parents:
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281 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
282
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
283 private boolean fill() throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
284 if (!buffer.hasRemaining()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
285 bufferStartInFile += buffer.limit();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
286 buffer.clear();
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parents:
diff changeset
287 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
288 fileChannel.read(buffer);
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
289 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
290 }
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diff changeset
291 buffer.flip();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
292 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
293 return buffer.hasRemaining();
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parents:
diff changeset
294 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
295
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parents:
diff changeset
296 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
297 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
298 if (!buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
299 fill();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
300 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
301 while (length > 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
302 int tail = buffer.remaining();
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
303 if (tail == 0) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
304 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
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
305 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
306 if (tail >= length) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
307 buffer.get(buf, offset, length);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
308 } else {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
309 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
310 fill();
10
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parents:
diff changeset
311 }
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
312 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 23
diff changeset
313 length -= tail;
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
314 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
315 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
316
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
317 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
318 public byte readByte() throws IOException {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
319 if (buffer.hasRemaining()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
320 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
321 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
322 if (fill()) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
323 return buffer.get();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
324 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
325 throw new IOException();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
326 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
327
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
328 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
329 public void done() {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
330 if (buffer != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
331 buffer = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
332 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
333 if (fileChannel != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
334 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
335 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
336 } catch (IOException ex) {
396
0ae53c32ecef Straighten out exceptions thrown when file access failed - three is too much
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 338
diff changeset
337 // FIXME/TODO log facility can be obtained from session context
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 158
diff changeset
338 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
339 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
340 fileChannel = null;
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
341 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
342 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
343 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
344 }