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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 157:d5268ca7715b

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Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 05:22:17 +0100
parents src/com/tmate/hgkit/fs/DataAccessProvider.java@9429c7bd1920 src/com/tmate/hgkit/fs/DataAccessProvider.java@a3a2e5deb320
children b413b16d10a5
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 /**
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class DataAccessProvider {
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32
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33 private final int mapioMagicBoundary;
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34 private final int bufferSize;
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35
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36 public DataAccessProvider() {
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37 this(100 * 1024, 8 * 1024);
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38 }
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39
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40 public DataAccessProvider(int mapioBoundary, int regularBufferSize) {
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41 mapioMagicBoundary = mapioBoundary;
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42 bufferSize = regularBufferSize;
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43 }
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45 public DataAccess create(File f) {
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46 if (!f.exists()) {
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47 return new DataAccess();
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48 }
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49 try {
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50 FileChannel fc = new FileInputStream(f).getChannel();
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51 if (fc.size() > mapioMagicBoundary) {
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52 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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53 return new MemoryMapFileAccess(fc, fc.size(), mapioMagicBoundary);
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54 } else {
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55 // XXX once implementation is more or less stable,
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56 // may want to try ByteBuffer.allocateDirect() to see
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57 // if there's any performance gain.
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58 boolean useDirectBuffer = false;
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59 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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60 return new FileAccess(fc, fc.size(), bufferSize, useDirectBuffer);
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61 }
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62 } catch (IOException ex) {
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63 // unlikely to happen, we've made sure file exists.
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64 ex.printStackTrace(); // FIXME log error
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65 }
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66 return new DataAccess(); // non-null, empty.
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67 }
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69 // DOESN'T WORK YET
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70 private static class MemoryMapFileAccess extends DataAccess {
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71 private FileChannel fileChannel;
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72 private final long size;
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73 private long position = 0; // always points to buffer's absolute position in the file
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74 private final int memBufferSize;
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75 private MappedByteBuffer buffer;
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76
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77 public MemoryMapFileAccess(FileChannel fc, long channelSize, int /*long?*/ bufferSize) {
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78 fileChannel = fc;
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79 size = channelSize;
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80 memBufferSize = bufferSize;
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81 }
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83 @Override
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84 public boolean isEmpty() {
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85 return position + (buffer == null ? 0 : buffer.position()) >= size;
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86 }
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88 @Override
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89 public long length() {
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90 return size;
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91 }
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92
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93 @Override
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94 public DataAccess reset() throws IOException {
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95 seek(0);
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96 return this;
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97 }
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98
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99 @Override
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100 public void seek(long offset) {
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101 assert offset >= 0;
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102 // offset may not necessarily be further than current position in the file (e.g. rewind)
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103 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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104 buffer.position((int) (offset - position));
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105 } else {
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106 position = offset;
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107 buffer = null;
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108 }
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109 }
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110
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111 @Override
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112 public void skip(int bytes) throws IOException {
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113 assert bytes >= 0;
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114 if (buffer == null) {
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115 position += bytes;
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116 return;
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117 }
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118 if (buffer.remaining() > bytes) {
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119 buffer.position(buffer.position() + bytes);
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120 } else {
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121 position += buffer.position() + bytes;
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122 buffer = null;
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123 }
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124 }
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125
26
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126 private void fill() throws IOException {
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127 if (buffer != null) {
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128 position += buffer.position();
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129 }
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130 long left = size - position;
26
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131 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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132 }
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133
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134 @Override
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135 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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136 if (buffer == null || !buffer.hasRemaining()) {
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137 fill();
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138 }
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139 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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140 while (length > 0) {
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141 int tail = buffer.remaining();
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142 if (tail == 0) {
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143 throw new IOException();
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144 }
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145 if (tail >= length) {
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146 buffer.get(buf, offset, length);
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147 } else {
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148 buffer.get(buf, offset, tail);
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149 fill();
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150 }
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151 offset += tail;
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152 length -= tail;
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153 }
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154 }
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155
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156 @Override
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157 public byte readByte() throws IOException {
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158 if (buffer == null || !buffer.hasRemaining()) {
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159 fill();
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160 }
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161 if (buffer.hasRemaining()) {
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162 return buffer.get();
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163 }
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164 throw new IOException();
10
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165 }
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166
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167 @Override
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168 public void done() {
26
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169 buffer = null;
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170 if (fileChannel != null) {
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171 try {
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172 fileChannel.close();
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173 } catch (IOException ex) {
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174 ex.printStackTrace(); // log debug
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175 }
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176 fileChannel = null;
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177 }
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178 }
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179 }
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180
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181 // (almost) regular file access - FileChannel and buffers.
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182 private static class FileAccess extends DataAccess {
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183 private FileChannel fileChannel;
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184 private final long size;
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185 private ByteBuffer buffer;
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186 private long bufferStartInFile = 0; // offset of this.buffer in the file.
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187
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188 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect) {
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189 fileChannel = fc;
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190 size = channelSize;
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191 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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192 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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193 buffer.flip(); // or .limit(0) to indicate it's empty
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194 }
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195
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196 @Override
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197 public boolean isEmpty() {
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198 return bufferStartInFile + buffer.position() >= size;
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199 }
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200
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201 @Override
51
9429c7bd1920 Try DataAccess to reach revision data instead of plain byte arrays
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202 public long length() {
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203 return size;
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204 }
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205
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206 @Override
157
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207 public DataAccess reset() throws IOException {
51
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208 seek(0);
157
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diff changeset
209 return this;
51
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210 }
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211
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diff changeset
212 @Override
10
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213 public void seek(long offset) throws IOException {
23
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diff changeset
214 if (offset > size) {
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215 throw new IllegalArgumentException();
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216 }
10
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217 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
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218 buffer.position((int) (offset - bufferStartInFile));
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219 } else {
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220 // out of current buffer, invalidate it (force re-read)
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221 // XXX or ever re-read it right away?
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222 bufferStartInFile = offset;
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223 buffer.clear();
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224 buffer.limit(0); // or .flip() to indicate we switch to reading
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225 fileChannel.position(offset);
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226 }
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227 }
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228
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229 @Override
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230 public void skip(int bytes) throws IOException {
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231 final int newPos = buffer.position() + bytes;
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232 if (newPos >= 0 && newPos < buffer.limit()) {
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233 // no need to move file pointer, just rewind/seek buffer
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234 buffer.position(newPos);
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235 } else {
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diff changeset
236 //
23
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diff changeset
237 seek(bufferStartInFile + newPos);
10
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238 }
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239 }
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240
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241 private boolean fill() throws IOException {
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242 if (!buffer.hasRemaining()) {
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243 bufferStartInFile += buffer.limit();
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244 buffer.clear();
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245 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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246 fileChannel.read(buffer);
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247 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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248 }
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249 buffer.flip();
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250 }
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251 return buffer.hasRemaining();
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252 }
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253
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254 @Override
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255 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
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256 if (!buffer.hasRemaining()) {
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257 fill();
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258 }
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259 while (length > 0) {
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260 int tail = buffer.remaining();
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261 if (tail == 0) {
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262 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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263 }
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264 if (tail >= length) {
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265 buffer.get(buf, offset, length);
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266 } else {
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267 buffer.get(buf, offset, tail);
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268 fill();
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269 }
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270 offset += tail;
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271 length -= tail;
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272 }
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273 }
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274
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275 @Override
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276 public byte readByte() throws IOException {
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277 if (buffer.hasRemaining()) {
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278 return buffer.get();
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279 }
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280 if (fill()) {
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281 return buffer.get();
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282 }
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283 throw new IOException();
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284 }
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285
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286 @Override
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287 public void done() {
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288 if (buffer != null) {
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289 buffer = null;
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290 }
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291 if (fileChannel != null) {
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292 try {
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293 fileChannel.close();
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294 } catch (IOException ex) {
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295 ex.printStackTrace(); // log debug
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296 }
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297 fileChannel = null;
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298 }
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299 }
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300 }
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301 }