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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 579:36e36b926747

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Provide means to read user-specific configuration, with no specific repository selected
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 17 Apr 2013 16:06:10 +0200
parents dd4f6311af52
children ed243b668502
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 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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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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20 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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22 import java.io.File;
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23 import java.io.FileInputStream;
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24 import java.io.FileNotFoundException;
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25 import java.io.FileOutputStream;
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26 import java.io.IOException;
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27 import java.io.OutputStream;
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28 import java.nio.ByteBuffer;
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29 import java.nio.MappedByteBuffer;
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30 import java.nio.channels.FileChannel;
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31
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32 import org.tmatesoft.hg.core.SessionContext;
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33 import org.tmatesoft.hg.util.LogFacility;
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34
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35 /**
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class DataAccessProvider {
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41 /**
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42 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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43 * Set to 0 to indicate mapping files into memory shall not be used.
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44 * If set to -1, file of any size would be mapped in memory.
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45 */
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46 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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47 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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48 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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49
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50 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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51 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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52 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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54 private final int mapioMagicBoundary;
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55 private final int bufferSize, mapioBufSize;
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56 private final SessionContext context;
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58 public DataAccessProvider(SessionContext ctx) {
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59 context = ctx;
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60 PropertyMarshal pm = new PropertyMarshal(ctx);
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61 mapioMagicBoundary = mapioBoundaryValue(pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT));
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62 bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
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63 mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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64 }
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65
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66 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
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67 context = ctx;
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68 mapioMagicBoundary = mapioBoundaryValue(mapioBoundary);
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69 bufferSize = regularBufferSize;
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70 mapioBufSize = mapioBufferSize;
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71 }
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72
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73 // ensure contract of CFG_PROPERTY_MAPIO_LIMIT, for mapioBoundary == 0 use MAX_VALUE so that no file is memmap-ed
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74 private static int mapioBoundaryValue(int mapioBoundary) {
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75 return mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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76 }
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78 public DataAccess createReader(File f) {
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79 if (!f.exists()) {
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80 return new DataAccess();
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81 }
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82 try {
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83 FileChannel fc = new FileInputStream(f).getChannel();
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84 long flen = fc.size();
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85 if (flen > mapioMagicBoundary) {
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86 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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87 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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88 } else {
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89 // XXX once implementation is more or less stable,
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90 // may want to try ByteBuffer.allocateDirect() to see
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91 // if there's any performance gain.
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92 boolean useDirectBuffer = false; // XXX might be another config option
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93 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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94 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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95 }
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96 } catch (IOException ex) {
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97 // unlikely to happen, we've made sure file exists.
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98 context.getLog().dump(getClass(), Error, ex, null);
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99 }
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100 return new DataAccess(); // non-null, empty.
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101 }
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103 public DataSerializer createWriter(File f, boolean createNewIfDoesntExist) {
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104 if (!f.exists() && !createNewIfDoesntExist) {
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105 return new DataSerializer();
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106 }
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107 try {
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108 return new StreamDataSerializer(context.getLog(), new FileOutputStream(f, true));
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109 } catch (final FileNotFoundException ex) {
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110 context.getLog().dump(getClass(), Error, ex, null);
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111 return new DataSerializer() {
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112 public void write(byte[] data, int offset, int length) throws IOException {
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113 throw ex;
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114 }
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115 };
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116 }
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117 }
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118
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119 private static class MemoryMapFileAccess extends DataAccess {
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120 private FileChannel fileChannel;
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121 private long position = 0; // always points to buffer's absolute position in the file
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122 private MappedByteBuffer buffer;
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123 private final long size;
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124 private final int memBufferSize;
425
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125 private final LogFacility logFacility;
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126
425
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127 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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128 fileChannel = fc;
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129 size = channelSize;
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130 logFacility = log;
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131 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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132 }
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133
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134 @Override
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135 public boolean isEmpty() {
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136 return position + (buffer == null ? 0 : buffer.position()) >= size;
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137 }
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138
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139 @Override
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140 public DataAccess reset() throws IOException {
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141 longSeek(0);
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142 return this;
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143 }
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144
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145 @Override
158
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146 public int length() {
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147 return Internals.ltoi(longLength());
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148 }
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149
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150 @Override
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151 public long longLength() {
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152 return size;
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153 }
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154
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155 @Override
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156 public void longSeek(long offset) {
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157 assert offset >= 0;
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158 // offset may not necessarily be further than current position in the file (e.g. rewind)
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159 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
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160 // cast is ok according to check above
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161 buffer.position(Internals.ltoi(offset - position));
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162 } else {
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163 position = offset;
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164 buffer = null;
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165 }
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166 }
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167
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168 @Override
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169 public void seek(int offset) {
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170 longSeek(offset);
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171 }
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172
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173 @Override
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174 public void skip(int bytes) throws IOException {
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175 assert bytes >= 0;
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176 if (buffer == null) {
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177 position += bytes;
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178 return;
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179 }
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180 if (buffer.remaining() > bytes) {
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181 buffer.position(buffer.position() + bytes);
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182 } else {
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183 position += buffer.position() + bytes;
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184 buffer = null;
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185 }
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186 }
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187
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188 private void fill() throws IOException {
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189 if (buffer != null) {
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190 position += buffer.position();
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191 }
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192 long left = size - position;
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193 for (int i = 0; i < 3; i++) {
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194 try {
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195 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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196 return;
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197 } catch (IOException ex) {
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198 if (i == 2) {
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199 throw ex;
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200 }
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201 if (i == 0) {
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202 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
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203 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
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204 }
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205 try {
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206 buffer = null;
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207 System.gc();
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208 Thread.sleep((1+i) * 1000);
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209 } catch (Throwable t) {
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210 logFacility.dump(getClass(), Error, t, "Bad luck");
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211 }
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212 }
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213 }
26
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214 }
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215
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216 @Override
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217 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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218 if (buffer == null || !buffer.hasRemaining()) {
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219 fill();
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220 }
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221 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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222 while (length > 0) {
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223 int tail = buffer.remaining();
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224 if (tail == 0) {
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225 throw new IOException();
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226 }
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227 if (tail >= length) {
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228 buffer.get(buf, offset, length);
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229 } else {
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230 buffer.get(buf, offset, tail);
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231 fill();
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232 }
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233 offset += tail;
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234 length -= tail;
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235 }
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236 }
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237
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238 @Override
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239 public byte readByte() throws IOException {
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240 if (buffer == null || !buffer.hasRemaining()) {
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241 fill();
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242 }
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243 if (buffer.hasRemaining()) {
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244 return buffer.get();
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245 }
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246 throw new IOException();
10
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247 }
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248
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249 @Override
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250 public void done() {
26
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251 buffer = null;
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252 if (fileChannel != null) {
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253 try {
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254 fileChannel.close();
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255 } catch (IOException ex) {
456
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256 logFacility.dump(getClass(), Warn, ex, null);
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257 }
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258 fileChannel = null;
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259 }
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260 }
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261 }
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262
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263 // (almost) regular file access - FileChannel and buffers.
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264 private static class FileAccess extends DataAccess {
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265 private FileChannel fileChannel;
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266 private ByteBuffer buffer;
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267 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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268 private final long size;
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269 private final LogFacility logFacility;
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270
425
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271 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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272 fileChannel = fc;
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273 size = channelSize;
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274 logFacility = log;
420
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275 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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276 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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277 buffer.flip(); // or .limit(0) to indicate it's empty
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278 }
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279
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280 @Override
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281 public boolean isEmpty() {
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282 return bufferStartInFile + buffer.position() >= size;
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283 }
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284
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285 @Override
420
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286 public DataAccess reset() throws IOException {
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287 longSeek(0);
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288 return this;
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289 }
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290
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291 @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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292 public int length() {
420
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293 return Internals.ltoi(longLength());
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294 }
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295
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296 @Override
420
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diff changeset
297 public long longLength() {
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298 return size;
51
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diff changeset
299 }
420
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diff changeset
300
51
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diff changeset
301 @Override
420
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diff changeset
302 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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diff changeset
303 if (offset > size) {
404
31a719b9f95e Provide more detailed information on erroneous file operation
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diff changeset
304 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
305 }
10
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306 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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diff changeset
307 // cast to int is safe, we've checked we fit into buffer
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diff changeset
308 buffer.position(Internals.ltoi(offset - bufferStartInFile));
10
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309 } else {
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310 // out of current buffer, invalidate it (force re-read)
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311 // XXX or ever re-read it right away?
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312 bufferStartInFile = offset;
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313 buffer.clear();
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diff changeset
314 buffer.limit(0); // or .flip() to indicate we switch to reading
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315 fileChannel.position(offset);
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diff changeset
316 }
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diff changeset
317 }
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318
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diff changeset
319 @Override
420
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diff changeset
320 public void seek(int offset) throws IOException {
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diff changeset
321 longSeek(offset);
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diff changeset
322 }
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diff changeset
323
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diff changeset
324 @Override
10
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diff changeset
325 public void skip(int bytes) throws IOException {
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diff changeset
326 final int newPos = buffer.position() + bytes;
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diff changeset
327 if (newPos >= 0 && newPos < buffer.limit()) {
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diff changeset
328 // no need to move file pointer, just rewind/seek buffer
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diff changeset
329 buffer.position(newPos);
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diff changeset
330 } else {
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diff changeset
331 //
420
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diff changeset
332 longSeek(bufferStartInFile + newPos);
10
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diff changeset
333 }
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diff changeset
334 }
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335
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diff changeset
336 private boolean fill() throws IOException {
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diff changeset
337 if (!buffer.hasRemaining()) {
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diff changeset
338 bufferStartInFile += buffer.limit();
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diff changeset
339 buffer.clear();
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diff changeset
340 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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diff changeset
341 fileChannel.read(buffer);
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diff changeset
342 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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diff changeset
343 }
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344 buffer.flip();
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345 }
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diff changeset
346 return buffer.hasRemaining();
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diff changeset
347 }
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348
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diff changeset
349 @Override
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diff changeset
350 public void readBytes(byte[] buf, int offset, int length) throws IOException {
26
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
351 if (!buffer.hasRemaining()) {
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diff changeset
352 fill();
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diff changeset
353 }
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354 while (length > 0) {
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355 int tail = buffer.remaining();
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356 if (tail == 0) {
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357 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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358 }
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359 if (tail >= length) {
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360 buffer.get(buf, offset, length);
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361 } else {
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362 buffer.get(buf, offset, tail);
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363 fill();
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364 }
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365 offset += tail;
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366 length -= tail;
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367 }
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368 }
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369
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370 @Override
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371 public byte readByte() throws IOException {
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372 if (buffer.hasRemaining()) {
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373 return buffer.get();
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374 }
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375 if (fill()) {
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376 return buffer.get();
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377 }
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378 throw new IOException();
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379 }
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380
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381 @Override
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382 public void done() {
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383 if (buffer != null) {
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384 buffer = null;
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385 }
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386 if (fileChannel != null) {
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387 try {
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388 fileChannel.close();
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389 } catch (IOException ex) {
456
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390 logFacility.dump(getClass(), Warn, ex, null);
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391 }
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392 fileChannel = null;
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393 }
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394 }
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395 }
534
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396
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397 public/*XXX, private, once HgCloneCommand stops using it */ static class StreamDataSerializer extends DataSerializer {
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398 private final OutputStream out;
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399 private final LogFacility log;
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400 private byte[] buffer;
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401
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402 public StreamDataSerializer(LogFacility logFacility, OutputStream os) {
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403 assert os != null;
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404 out = os;
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405 log = logFacility;
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406 }
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407
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408 @Override
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409 public void write(byte[] data, int offset, int length) throws IOException {
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410 out.write(data, offset, length);
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411 }
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412
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413 @Override
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414 public void writeInt(int... values) throws IOException {
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415 ensureBufferSize(4*values.length); // sizeof(int)
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416 int idx = 0;
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417 for (int v : values) {
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418 DataSerializer.bigEndian(v, buffer, idx);
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419 idx += 4;
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420 }
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421 out.write(buffer, 0, idx);
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422 }
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423
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424 @Override
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425 public void writeByte(byte... values) throws IOException {
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426 if (values.length == 1) {
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427 out.write(values[0]);
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428 } else {
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429 out.write(values, 0, values.length);
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430 }
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431 }
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432
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433 private void ensureBufferSize(int bytesNeeded) {
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434 if (buffer == null || buffer.length < bytesNeeded) {
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435 buffer = new byte[bytesNeeded];
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436 }
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437 }
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438
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439 @Override
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440 public void done() {
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441 try {
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442 out.flush();
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443 out.close();
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444 } catch (IOException ex) {
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445 log.dump(getClass(), Error, ex, "Failure to close stream");
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446 }
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447 }
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448 }
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449 }