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annotate src/org/tmatesoft/hg/internal/DataAccessProvider.java @ 490:b3c16d1aede0

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Refactoring: move HgRepository's implementation aspects to Internals (which is now its imlementation counterpart and primary repository class to be used by other parts of the library)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 16 Aug 2012 17:08:34 +0200
parents 909306e412e2
children 2743641f2f12
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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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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.IOException;
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25 import java.nio.ByteBuffer;
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26 import java.nio.MappedByteBuffer;
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27 import java.nio.channels.FileChannel;
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29 import org.tmatesoft.hg.core.SessionContext;
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30 import org.tmatesoft.hg.util.LogFacility;
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32 /**
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class DataAccessProvider {
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38 /**
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39 * Boundary to start using file memory mapping instead of regular file access, in bytes.
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40 * Set to 0 to indicate mapping files into memory shall not be used.
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41 * If set to -1, file of any size would be mapped in memory.
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42 */
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43 public static final String CFG_PROPERTY_MAPIO_LIMIT = "hg4j.dap.mapio_limit";
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44 public static final String CFG_PROPERTY_MAPIO_BUFFER_SIZE = "hg4j.dap.mapio_buffer";
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45 public static final String CFG_PROPERTY_FILE_BUFFER_SIZE = "hg4j.dap.file_buffer";
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47 private static final int DEFAULT_MAPIO_LIMIT = 100 * 1024; // 100 kB
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48 private static final int DEFAULT_FILE_BUFFER = 8 * 1024; // 8 kB
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49 private static final int DEFAULT_MAPIO_BUFFER = DEFAULT_MAPIO_LIMIT; // same as default boundary
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51 private final int mapioMagicBoundary;
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52 private final int bufferSize, mapioBufSize;
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53 private final SessionContext context;
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54
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55 public DataAccessProvider(SessionContext ctx) {
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56 context = ctx;
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57 PropertyMarshal pm = new PropertyMarshal(ctx);
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58 mapioMagicBoundary = pm.getInt(CFG_PROPERTY_MAPIO_LIMIT, DEFAULT_MAPIO_LIMIT);
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59 bufferSize = pm.getInt(CFG_PROPERTY_FILE_BUFFER_SIZE, DEFAULT_FILE_BUFFER);
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60 mapioBufSize = pm.getInt(CFG_PROPERTY_MAPIO_BUFFER_SIZE, DEFAULT_MAPIO_BUFFER);
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61 }
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63 public DataAccessProvider(SessionContext ctx, int mapioBoundary, int regularBufferSize, int mapioBufferSize) {
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64 context = ctx;
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65 mapioMagicBoundary = mapioBoundary == 0 ? Integer.MAX_VALUE : mapioBoundary;
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66 bufferSize = regularBufferSize;
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67 mapioBufSize = mapioBufferSize;
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68 }
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70 public DataAccess create(File f) {
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71 if (!f.exists()) {
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72 return new DataAccess();
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73 }
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74 try {
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75 FileChannel fc = new FileInputStream(f).getChannel();
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76 long flen = fc.size();
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77 if (flen > mapioMagicBoundary) {
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78 // TESTS: bufLen of 1024 was used to test MemMapFileAccess
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79 return new MemoryMapFileAccess(fc, flen, mapioBufSize, context.getLog());
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80 } else {
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81 // XXX once implementation is more or less stable,
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82 // may want to try ByteBuffer.allocateDirect() to see
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83 // if there's any performance gain.
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84 boolean useDirectBuffer = false; // XXX might be another config option
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85 // TESTS: bufferSize of 100 was used to check buffer underflow states when readBytes reads chunks bigger than bufSize
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86 return new FileAccess(fc, flen, bufferSize, useDirectBuffer, context.getLog());
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87 }
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88 } catch (IOException ex) {
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89 // unlikely to happen, we've made sure file exists.
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90 context.getLog().dump(getClass(), Error, ex, null);
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91 }
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92 return new DataAccess(); // non-null, empty.
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93 }
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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 long position = 0; // always points to buffer's absolute position in the file
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98 private MappedByteBuffer buffer;
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99 private final long size;
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100 private final int memBufferSize;
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101 private final LogFacility logFacility;
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102
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103 public MemoryMapFileAccess(FileChannel fc, long channelSize, int bufferSize, LogFacility log) {
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104 fileChannel = fc;
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105 size = channelSize;
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106 logFacility = log;
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107 memBufferSize = bufferSize > channelSize ? (int) channelSize : bufferSize; // no reason to waste memory more than there's data
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108 }
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110 @Override
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111 public boolean isEmpty() {
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112 return position + (buffer == null ? 0 : buffer.position()) >= size;
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113 }
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diff changeset
114
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
115 @Override
420
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diff changeset
116 public DataAccess reset() throws IOException {
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diff changeset
117 longSeek(0);
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diff changeset
118 return this;
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diff changeset
119 }
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diff changeset
120
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diff changeset
121 @Override
158
b413b16d10a5 Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
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diff changeset
122 public int length() {
420
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diff changeset
123 return Internals.ltoi(longLength());
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124 }
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125
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diff changeset
126 @Override
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diff changeset
127 public long longLength() {
51
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diff changeset
128 return size;
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129 }
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130
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diff changeset
131 @Override
420
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diff changeset
132 public void longSeek(long offset) {
26
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133 assert offset >= 0;
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134 // offset may not necessarily be further than current position in the file (e.g. rewind)
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diff changeset
135 if (buffer != null && /*offset is within buffer*/ offset >= position && (offset - position) < buffer.limit()) {
420
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diff changeset
136 // cast is ok according to check above
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diff changeset
137 buffer.position(Internals.ltoi(offset - position));
26
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138 } else {
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139 position = offset;
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140 buffer = null;
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141 }
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142 }
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143
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144 @Override
420
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diff changeset
145 public void seek(int offset) {
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diff changeset
146 longSeek(offset);
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147 }
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148
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diff changeset
149 @Override
10
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150 public void skip(int bytes) throws IOException {
26
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151 assert bytes >= 0;
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152 if (buffer == null) {
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153 position += bytes;
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154 return;
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155 }
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diff changeset
156 if (buffer.remaining() > bytes) {
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diff changeset
157 buffer.position(buffer.position() + bytes);
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158 } else {
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diff changeset
159 position += buffer.position() + bytes;
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diff changeset
160 buffer = null;
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161 }
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162 }
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163
26
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164 private void fill() throws IOException {
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diff changeset
165 if (buffer != null) {
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diff changeset
166 position += buffer.position();
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167 }
10
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168 long left = size - position;
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
169 for (int i = 0; i < 3; i++) {
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diff changeset
170 try {
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diff changeset
171 buffer = fileChannel.map(FileChannel.MapMode.READ_ONLY, position, left < memBufferSize ? left : memBufferSize);
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diff changeset
172 return;
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diff changeset
173 } catch (IOException ex) {
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diff changeset
174 if (i == 2) {
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diff changeset
175 throw ex;
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176 }
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diff changeset
177 if (i == 0) {
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diff changeset
178 // if first attempt failed, try to free some virtual memory, see Issue 30 for details
456
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diff changeset
179 logFacility.dump(getClass(), Warn, ex, "Memory-map failed, gonna try gc() to free virtual memory");
440
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diff changeset
180 }
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diff changeset
181 try {
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diff changeset
182 buffer = null;
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diff changeset
183 System.gc();
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diff changeset
184 Thread.sleep((1+i) * 1000);
299870249a28 Issue 30: bogus IOException for mmap file on linux
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parents: 425
diff changeset
185 } catch (Throwable t) {
456
909306e412e2 Refactor LogFacility and SessionContext, better API for both
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parents: 440
diff changeset
186 logFacility.dump(getClass(), Error, t, "Bad luck");
440
299870249a28 Issue 30: bogus IOException for mmap file on linux
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diff changeset
187 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
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diff changeset
188 }
299870249a28 Issue 30: bogus IOException for mmap file on linux
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diff changeset
189 }
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
190 }
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diff changeset
191
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diff changeset
192 @Override
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diff changeset
193 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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diff changeset
194 if (buffer == null || !buffer.hasRemaining()) {
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diff changeset
195 fill();
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diff changeset
196 }
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diff changeset
197 // XXX in fact, we may try to create a MappedByteBuffer of exactly length size here, and read right away
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diff changeset
198 while (length > 0) {
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diff changeset
199 int tail = buffer.remaining();
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
200 if (tail == 0) {
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
201 throw new IOException();
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diff changeset
202 }
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diff changeset
203 if (tail >= length) {
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diff changeset
204 buffer.get(buf, offset, length);
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diff changeset
205 } else {
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diff changeset
206 buffer.get(buf, offset, tail);
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diff changeset
207 fill();
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diff changeset
208 }
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parents: 23
diff changeset
209 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
210 length -= tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
211 }
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parents: 23
diff changeset
212 }
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parents: 23
diff changeset
213
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
214 @Override
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diff changeset
215 public byte readByte() throws IOException {
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parents: 23
diff changeset
216 if (buffer == null || !buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
217 fill();
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
218 }
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parents: 23
diff changeset
219 if (buffer.hasRemaining()) {
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
220 return buffer.get();
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diff changeset
221 }
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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parents: 23
diff changeset
222 throw new IOException();
10
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
223 }
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
224
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
225 @Override
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
226 public void done() {
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
227 buffer = null;
10
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diff changeset
228 if (fileChannel != null) {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
229 try {
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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diff changeset
230 fileChannel.close();
382cfe9463db Dirstate parsing. DataAccess refactored to allow reuse and control over constants
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parents:
diff changeset
231 } catch (IOException ex) {
456
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232 logFacility.dump(getClass(), Warn, ex, null);
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233 }
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234 fileChannel = null;
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235 }
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236 }
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237 }
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238
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239 // (almost) regular file access - FileChannel and buffers.
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240 private static class FileAccess extends DataAccess {
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241 private FileChannel fileChannel;
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242 private ByteBuffer buffer;
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243 private long bufferStartInFile = 0; // offset of this.buffer in the file.
425
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244 private final long size;
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245 private final LogFacility logFacility;
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246
425
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247 public FileAccess(FileChannel fc, long channelSize, int bufferSizeHint, boolean useDirect, LogFacility log) {
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248 fileChannel = fc;
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249 size = channelSize;
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250 logFacility = log;
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251 final int capacity = size < bufferSizeHint ? (int) size : bufferSizeHint;
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252 buffer = useDirect ? ByteBuffer.allocateDirect(capacity) : ByteBuffer.allocate(capacity);
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253 buffer.flip(); // or .limit(0) to indicate it's empty
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254 }
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255
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256 @Override
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257 public boolean isEmpty() {
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258 return bufferStartInFile + buffer.position() >= size;
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259 }
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260
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261 @Override
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262 public DataAccess reset() throws IOException {
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263 longSeek(0);
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264 return this;
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265 }
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266
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267 @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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268 public int length() {
420
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269 return Internals.ltoi(longLength());
51
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270 }
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271
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272 @Override
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273 public long longLength() {
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274 return size;
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275 }
420
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276
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277 @Override
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278 public void longSeek(long offset) throws IOException {
23
6f9aca1a97be Severe defect in buffer wrap on seek
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279 if (offset > size) {
404
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280 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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281 }
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282 if (offset < bufferStartInFile + buffer.limit() && offset >= bufferStartInFile) {
420
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283 // cast to int is safe, we've checked we fit into buffer
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284 buffer.position(Internals.ltoi(offset - bufferStartInFile));
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285 } else {
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286 // out of current buffer, invalidate it (force re-read)
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287 // XXX or ever re-read it right away?
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288 bufferStartInFile = offset;
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289 buffer.clear();
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290 buffer.limit(0); // or .flip() to indicate we switch to reading
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291 fileChannel.position(offset);
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292 }
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293 }
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294
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295 @Override
420
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296 public void seek(int offset) throws IOException {
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297 longSeek(offset);
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298 }
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299
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300 @Override
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301 public void skip(int bytes) throws IOException {
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302 final int newPos = buffer.position() + bytes;
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303 if (newPos >= 0 && newPos < buffer.limit()) {
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304 // no need to move file pointer, just rewind/seek buffer
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305 buffer.position(newPos);
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306 } else {
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307 //
420
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diff changeset
308 longSeek(bufferStartInFile + newPos);
10
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309 }
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310 }
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311
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312 private boolean fill() throws IOException {
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diff changeset
313 if (!buffer.hasRemaining()) {
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314 bufferStartInFile += buffer.limit();
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315 buffer.clear();
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316 if (bufferStartInFile < size) { // just in case there'd be any exception on EOF, not -1
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317 fileChannel.read(buffer);
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318 // may return -1 when EOF, but empty will reflect this, hence no explicit support here
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319 }
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320 buffer.flip();
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321 }
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322 return buffer.hasRemaining();
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323 }
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324
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325 @Override
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diff changeset
326 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
327 if (!buffer.hasRemaining()) {
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diff changeset
328 fill();
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diff changeset
329 }
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diff changeset
330 while (length > 0) {
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diff changeset
331 int tail = buffer.remaining();
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diff changeset
332 if (tail == 0) {
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diff changeset
333 throw new IOException(); // shall not happen provided stream contains expected data and no attempts to read past isEmpty() == true are made.
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
334 }
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diff changeset
335 if (tail >= length) {
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diff changeset
336 buffer.get(buf, offset, length);
10
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337 } else {
26
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diff changeset
338 buffer.get(buf, offset, tail);
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
339 fill();
10
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diff changeset
340 }
26
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diff changeset
341 offset += tail;
71a9ba42cee8 Memory-mapped files for bigger files. Defect reading number of bytes greater than size of the buffer fixed
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diff changeset
342 length -= tail;
10
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diff changeset
343 }
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344 }
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345
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diff changeset
346 @Override
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diff changeset
347 public byte readByte() throws IOException {
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diff changeset
348 if (buffer.hasRemaining()) {
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diff changeset
349 return buffer.get();
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diff changeset
350 }
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diff changeset
351 if (fill()) {
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352 return buffer.get();
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diff changeset
353 }
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diff changeset
354 throw new IOException();
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355 }
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356
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357 @Override
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358 public void done() {
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359 if (buffer != null) {
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360 buffer = null;
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361 }
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362 if (fileChannel != null) {
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363 try {
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364 fileChannel.close();
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365 } catch (IOException ex) {
456
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366 logFacility.dump(getClass(), Warn, ex, null);
10
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367 }
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368 fileChannel = null;
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369 }
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370 }
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371 }
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372 }