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1 package goodjava.lucene.logging;
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2
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3 import java.io.File;
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4 import java.io.RandomAccessFile;
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5 import java.io.ByteArrayOutputStream;
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6 import java.io.DataOutputStream;
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7 import java.io.DataInputStream;
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8 import java.io.FileInputStream;
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9 import java.io.IOException;
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10 import java.util.Map;
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11 import java.util.Set;
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12 import java.util.HashSet;
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13 import java.util.List;
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14 import java.util.ArrayList;
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15 import java.util.Random;
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16 import org.apache.lucene.document.Document;
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17 import org.apache.lucene.index.DirectoryReader;
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18 import org.apache.lucene.index.IndexReader;
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19 import org.apache.lucene.search.IndexSearcher;
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20 import org.apache.lucene.search.Query;
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21 import org.apache.lucene.search.MatchAllDocsQuery;
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22 import org.apache.lucene.search.TopDocs;
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23 import org.apache.lucene.store.Directory;
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24 import org.apache.lucene.store.FSDirectory;
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25 import goodjava.lucene.api.GoodIndexWriter;
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26 import goodjava.lucene.api.LuceneIndexWriter;
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27 import goodjava.lucene.api.GoodCollector;
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28 import goodjava.lucene.api.LuceneUtils;
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29 import goodjava.logging.Logger;
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30 import goodjava.logging.LoggerFactory;
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31
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32
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33 public final class LoggingIndexWriter implements GoodIndexWriter {
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34 private static final Logger logger = LoggerFactory.getLogger(LoggingIndexWriter.class);
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35 private static final int version = 1;
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36 private static final int OP_DELETE_ALL = 1;
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37 private static final int OP_DELETE_DOCUMENTS = 2;
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38 private static final int OP_ADD_DOCUMENT = 3;
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39 private static final int OP_UPDATE_DOCUMENT = 4;
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40 private static final Random rnd = new Random();
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41
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42 public final LuceneIndexWriter indexWriter;
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43 private final File logDir;
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44 private final List<LogFile> logs = new ArrayList<LogFile>();
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45 private final File index;
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46 private boolean isMerging = false;
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47
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48 public LoggingIndexWriter(LuceneIndexWriter indexWriter,File logDir) throws IOException {
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49 this.indexWriter = indexWriter;
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50 this.logDir = logDir;
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51 logDir.mkdirs();
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52 if( !logDir.isDirectory() )
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53 throw new RuntimeException();
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54 index = new File(logDir,"index");
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55 if( index.exists() ) {
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56 DataInputStream dis = new DataInputStream(new FileInputStream(index));
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57 try {
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58 if( dis.readInt() == version ) {
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59 final int n = dis.readInt();
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60 for( int i=0; i<n; i++ ) {
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61 File file = new File( logDir, dis.readUTF() );
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62 logs.add( new LogFile(file,"rwd") );
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63 }
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64 deleteUnusedFiles();
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65 log().gotoEnd();
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66 return;
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67 }
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68 } finally {
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69 dis.close();
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70 }
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71 }
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72 for( int i=0; i<2; i++ ) {
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73 logs.add( newLogFile() );
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74 }
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75 isMerging = true;
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76 new Thread(new Runnable(){public void run(){
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77 try {
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78 logLucene( System.currentTimeMillis(), logs.get(0), indexWriter );
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79 synchronized(LoggingIndexWriter.this) {
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80 writeIndex();
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81 }
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82 } catch(IOException e) {
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83 throw new RuntimeException(e);
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84 } finally {
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85 synchronized(LoggingIndexWriter.this) {
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86 isMerging = false;
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87 }
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88 }
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89 }}).start();
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90 }
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91
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92 private static void logLucene(long time,LogFile log,LuceneIndexWriter indexWriter) throws IOException {
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93 IndexReader reader = indexWriter.openReader();
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94 final IndexSearcher searcher = new IndexSearcher(reader);
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95 Query query = new MatchAllDocsQuery();
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96 searcher.search( query, new GoodCollector(){
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97 public void collectDoc(int iDoc) throws IOException {
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98 Document doc = searcher.doc(iDoc);
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99 Map<String,Object> storedFields = LuceneUtils.toMap(doc);
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100 log.writeLong(time);
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101 log.writeByte(OP_ADD_DOCUMENT);
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102 log.writeMap(storedFields);
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103 }
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104 });
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105 reader.close();
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106 log.commit();
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107 }
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108
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109 private LogFile newLogFile() throws IOException {
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110 File file;
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111 do {
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112 file = new File(logDir,"_"+rnd.nextInt(100)+".log");
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113 } while( file.exists() );
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114 return new LogFile(file,"rwd");
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115 }
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116
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117 private void deleteUnusedFiles() {
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118 Set<String> used = new HashSet<String>();
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119 used.add( index.getName() );
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120 for( LogFile lf : logs ) {
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121 used.add( lf.file.getName() );
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122 }
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123 for( File f : logDir.listFiles() ) {
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124 if( !used.contains(f.getName()) ) {
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125 deleteFile(f);
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126 }
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127 }
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128 }
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129
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130 private static void deleteFile(File file) {
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131 if( file.isDirectory() ) {
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132 for( File f : file.listFiles() ) {
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133 deleteFile(f);
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134 }
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135 }
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136 if( !file.delete() )
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137 throw new RuntimeException(file.getName());
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138 }
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139
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140 private void writeIndex() throws IOException {
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141 ByteArrayOutputStream baos = new ByteArrayOutputStream();
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142 DataOutputStream dos = new DataOutputStream(baos);
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143 dos.writeInt(version);
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144 dos.writeInt(logs.size());
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145 for( LogFile lf : logs ) {
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146 String fileName = lf.file.getName();
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147 dos.writeUTF(fileName);
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148 }
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149 dos.close();
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150 RandomAccessFile raf = new RandomAccessFile( index, "rwd" );
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151 raf.write( baos.toByteArray() );
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152 raf.close();
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153 deleteUnusedFiles();
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154 logger.info("writeIndex "+logs.toString());
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155 }
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156
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157 private void mergeLogs() throws IOException {
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158 logger.info("merge");
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159 LogFile first = logs.get(0);
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160 LogFile second = logs.get(1);
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161 second.gotoEnd();
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162 long lastTime = second.readLong();
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163 File dirFile = new File(logDir,"merge");
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164 if( dirFile.exists() )
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165 throw new RuntimeException();
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166 Directory dir = FSDirectory.open(dirFile);
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167 LuceneIndexWriter mergeWriter = new LuceneIndexWriter( indexWriter.luceneVersion, dir, indexWriter.goodConfig );
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168 playLog(first,mergeWriter);
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169 playLog(second,mergeWriter);
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170 mergeWriter.commit();
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171 LogFile merge = newLogFile();
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172 logLucene( lastTime, merge, mergeWriter );
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173 mergeWriter.close();
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174 synchronized(this) {
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175 check();
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176 logs.remove(0);
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177 logs.set(0,merge);
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178 writeIndex();
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179 check();
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180 }
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181 }
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182 private final Runnable mergeLogs = new Runnable() { public void run() {
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183 try {
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184 mergeLogs();
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185 /*
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186 } catch(IOException e) {
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187 throw new RuntimeException(e);
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188 */
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189 } catch(Exception e) {
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190 e.printStackTrace();
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191 System.exit(-1);
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192 } finally {
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193 synchronized(LoggingIndexWriter.this) {
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194 isMerging = false;
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195 }
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196 }
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197 } };
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198
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199 private void check() throws IOException {
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200 File dirFile = new File(logDir,"check");
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201 if( dirFile.exists() )
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202 throw new RuntimeException();
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203 Directory dir = FSDirectory.open(dirFile);
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204 LuceneIndexWriter checkWriter = new LuceneIndexWriter( indexWriter.luceneVersion, dir, indexWriter.goodConfig );
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205 playLog(checkWriter);
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206 int nCheck = numDocs(checkWriter);
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207 int nOrig = numDocs(indexWriter);
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208 if( nCheck != nOrig ) {
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209 logger.error("nCheck = "+nCheck);
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210 logger.error("nOrig = "+nOrig);
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211 //new Exception().printStackTrace();
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212 Thread.dumpStack();
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213 System.out.println();
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214 System.out.println("indexWriter");
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215 dump(indexWriter);
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216 System.out.println("checkWriter");
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217 dump(checkWriter);
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218 System.exit(-1);
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219 }
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220 checkWriter.close();
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221 deleteFile(dirFile);
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222 }
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223
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224 private LogFile log() {
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225 return logs.get(logs.size()-1);
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226 }
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227
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228 public synchronized void close() throws IOException {
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229 indexWriter.close();
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230 LogFile log = log();
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231 log.commit();
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232 }
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233
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234 public synchronized void commit() throws IOException {
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235 indexWriter.commit();
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236 LogFile log = log();
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237 log.commit();
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238 if( isMerging )
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239 return;
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240 if( log.length() > logs.get(0).length() ) {
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241 log.writeLong( System.currentTimeMillis() );
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242 logs.add( newLogFile() );
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243 writeIndex();
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244 }
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245 if( logs.size() > 3 ) {
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246 isMerging = true;
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247 // new Thread(mergeLogs).start();
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248 mergeLogs.run();
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249 }
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250 }
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251
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252 public synchronized void rollback() throws IOException {
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253 indexWriter.rollback();
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254 LogFile log = log();
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255 log.gotoEnd();
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256 }
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257
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258 public synchronized void deleteAll() throws IOException {
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259 indexWriter.deleteAll();
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260 LogFile log = log();
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261 writeOp(log,OP_DELETE_ALL);
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262 }
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263
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264 public synchronized void deleteDocuments(Query query) throws IOException {
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265 indexWriter.deleteDocuments(query);
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266 LogFile log = log();
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267 writeOp(log,OP_DELETE_DOCUMENTS);
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268 log.writeQuery(query);
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269 }
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270
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271 public synchronized void addDocument(Map<String,Object> storedFields) throws IOException {
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272 indexWriter.addDocument(storedFields);
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273 LogFile log = log();
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274 writeOp(log,OP_ADD_DOCUMENT);
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275 log.writeMap(storedFields);
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276 }
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277
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278 public synchronized void updateDocument(String keyFieldName,Map<String,Object> storedFields) throws IOException {
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279 indexWriter.updateDocument(keyFieldName,storedFields);
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280 LogFile log = log();
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281 writeOp(log,OP_UPDATE_DOCUMENT);
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282 log.writeUTF(keyFieldName);
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283 log.writeMap(storedFields);
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284 }
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285
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286 public synchronized void reindexDocuments(String keyFieldName,Query query) throws IOException {
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287 indexWriter.reindexDocuments(keyFieldName,query);
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288 }
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289
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290 private void writeOp(LogFile log,int op) throws IOException {
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291 log.writeLong(System.currentTimeMillis());
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292 log.writeByte(op);
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293 }
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294
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295 public synchronized void playLog() throws IOException {
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296 playLog(indexWriter);
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297 }
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298
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299 private void playLog(LuceneIndexWriter indexWriter) throws IOException {
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300 if( numDocs(indexWriter) != 0 )
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301 throw new RuntimeException ("not empty");
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302 for( LogFile log : logs ) {
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303 playLog(log,indexWriter);
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304 }
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305 indexWriter.commit();
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306 }
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307
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308 private static int numDocs(LuceneIndexWriter indexWriter) throws IOException {
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309 IndexReader reader = indexWriter.openReader();
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310 int n = reader.numDocs();
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311 reader.close();
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312 return n;
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313 }
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314
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315 private static void playLog(LogFile log,LuceneIndexWriter indexWriter) throws IOException {
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316 log.gotoStart();
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317 while( log.hasMore() ) {
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318 playOp(log,indexWriter);
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319 }
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320 }
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321
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322 private static void playOp(LogFile log,LuceneIndexWriter indexWriter) throws IOException {
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323 log.readLong(); // time
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324 int op = log.readByte();
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325 switch(op) {
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326 case OP_DELETE_ALL:
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327 indexWriter.deleteAll();
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328 return;
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329 case OP_DELETE_DOCUMENTS:
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330 indexWriter.deleteDocuments( log.readQuery() );
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331 return;
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332 case OP_ADD_DOCUMENT:
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333 {
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334 Map storedFields = log.readMap();
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335 indexWriter.addDocument(storedFields);
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336 return;
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337 }
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338 case OP_UPDATE_DOCUMENT:
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339 {
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340 String keyFieldName = log.readUTF();
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341 Map storedFields = log.readMap();
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342 indexWriter.updateDocument(keyFieldName,storedFields);
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343 return;
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344 }
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345 default:
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346 throw new RuntimeException("invalid op "+op);
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347 }
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348 }
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349
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350 private static void dump(LuceneIndexWriter indexWriter) throws IOException {
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351 IndexReader reader = indexWriter.openReader();
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352 IndexSearcher searcher = new IndexSearcher(reader);
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353 Query query = new MatchAllDocsQuery();
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354 TopDocs td = searcher.search(query,100);
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355 System.out.println("totalHits = "+td.totalHits);
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356 for( int i=0; i<td.scoreDocs.length; i++ ) {
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357 Document doc = searcher.doc(td.scoreDocs[i].doc);
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358 System.out.println(LuceneUtils.toMap(doc));
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359 }
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360 System.out.println();
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361 reader.close();
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362 }
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363
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364 }
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