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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 417:ccd7d25e5aea

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New and better name for HgFileInformer - HgChangesetFileSneaker. Explain (comments) ties between HgManifest, HgDataFile, HgChangesetFileSneaker and reasons for method placement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 20:14:06 +0100
parents bb278ccf9866
children 6c22bdc0bdfd
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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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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 {
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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
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238 public void seek(int offset) throws IOException {
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239 if (offset > size) {
404
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240 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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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 //
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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
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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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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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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 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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308 throw new IOException();
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diff changeset
309 }
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310
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311 @Override
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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) {
396
0ae53c32ecef Straighten out exceptions thrown when file access failed - three is too much
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parents: 338
diff changeset
320 // FIXME/TODO log facility can be obtained from session context
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
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parents: 158
diff changeset
321 StreamLogFacility.newDefault().debug(getClass(), ex, null);
10
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322 }
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diff changeset
323 fileChannel = null;
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diff changeset
324 }
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parents:
diff changeset
325 }
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parents:
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326 }
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parents:
diff changeset
327 }