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annotate lucene/src/luan/modules/lucene/LuceneIndex.java @ 233:ef39bc4d3f70

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basic lucene works git-svn-id: https://luan-java.googlecode.com/svn/trunk@234 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 02 Oct 2014 02:58:55 +0000
parents 9ce18106f95a
children 3896138955b1
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1 package luan.modules.lucene;
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2
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3 import java.io.File;
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4 import java.io.FileOutputStream;
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5 import java.io.FileInputStream;
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6 import java.io.IOException;
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7 import java.util.concurrent.locks.Lock;
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8 import java.util.concurrent.locks.ReentrantLock;
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9 import java.util.zip.ZipOutputStream;
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10 import java.util.zip.ZipEntry;
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11 import org.apache.lucene.analysis.Analyzer;
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12 import org.apache.lucene.analysis.standard.StandardAnalyzer;
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13 import org.apache.lucene.document.Document;
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14 import org.apache.lucene.index.IndexWriter;
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15 import org.apache.lucene.index.IndexWriterConfig;
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16 import org.apache.lucene.index.DirectoryReader;
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17 import org.apache.lucene.index.Term;
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18 import org.apache.lucene.index.SnapshotDeletionPolicy;
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19 import org.apache.lucene.store.Directory;
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20 import org.apache.lucene.store.FSDirectory;
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21 import org.apache.lucene.util.Version;
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22 import org.apache.lucene.search.TermQuery;
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23 import org.apache.lucene.search.TopDocs;
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24 import luan.modules.Utils;
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25 import luan.Luan;
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26 import luan.LuanState;
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27 import luan.LuanTable;
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28 import luan.LuanFunction;
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29 import luan.LuanJavaFunction;
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30 import luan.LuanException;
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32
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33 public final class LuceneIndex {
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34 private static final String FLD_NEXT_ID = "nextId";
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35
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36 final Lock writeLock = new ReentrantLock();
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37 private final File indexDir;
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38 final SnapshotDeletionPolicy snapshotDeletionPolicy;
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39 final IndexWriter writer;
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40 private DirectoryReader reader;
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41 private LuceneSearcher searcher;
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42 final FieldTable fields = new FieldTable();
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43
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44 public LuceneIndex(LuanState luan,String indexDirStr) throws LuanException, IOException {
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45 File indexDir = new File(indexDirStr);
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46 this.indexDir = indexDir;
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47 Directory dir = FSDirectory.open(indexDir);
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48 Version version = Version.LUCENE_4_9;
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49 Analyzer analyzer = new StandardAnalyzer(version);
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50 IndexWriterConfig conf = new IndexWriterConfig(version,analyzer);
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51 snapshotDeletionPolicy = new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy());
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52 conf.setIndexDeletionPolicy(snapshotDeletionPolicy);
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53 writer = new IndexWriter(dir,conf);
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54 writer.commit(); // commit index creation
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55 reader = DirectoryReader.open(dir);
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56 searcher = new LuceneSearcher(this,reader);
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57 initId(luan);
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58 }
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59
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60 Document toLucene(LuanState luan,LuanTable table) throws LuanException {
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61 return LuceneDocument.toLucene(luan,table,fields.map);
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62 }
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63
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64 LuanTable toTable(LuanState luan,Document doc) throws LuanException {
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65 return LuceneDocument.toTable(luan,doc,fields.reverseMap);
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66 }
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67
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68 String fixFieldName(String fld) {
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69 String s = fields.map.get(fld);
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70 return s!=null ? s : fld;
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71 }
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72
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73 Term newTerm(String fld,String text) {
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74 return new Term(fixFieldName(fld),text);
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75 }
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77 public LuceneWriter openWriter() {
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78 return new LuceneWriter(this);
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79 }
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80
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81 synchronized LuceneSearcher openSearcher() throws IOException {
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82 DirectoryReader newReader = DirectoryReader.openIfChanged(reader);
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83 if( newReader != null ) {
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84 reader.decRef();
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85 reader = newReader;
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86 searcher = new LuceneSearcher(this,reader);
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87 }
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88 reader.incRef();
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89 return searcher;
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90 }
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91
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92 LuceneSnapshot openSnapshot() throws IOException {
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93 return new LuceneSnapshot(this);
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94 }
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95
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96
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97 private long id = 0;
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98 private long idLim = 0;
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99 private final int idBatch = 10;
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100
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101 private void initId(LuanState luan) throws LuanException, IOException {
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102 TopDocs td = searcher.search(new TermQuery(newTerm("type","next_id")),1);
230
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103 switch(td.totalHits) {
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104 case 0:
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105 break; // do nothing
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106 case 1:
233
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107 LuanTable doc = searcher.doc(luan,td.scoreDocs[0].doc);
230
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108 idLim = (Long)doc.get(FLD_NEXT_ID);
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109 id = idLim;
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110 break;
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111 default:
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112 throw new RuntimeException();
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113 }
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114 }
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115
233
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116 synchronized String nextId(LuanState luan) throws LuanException, IOException {
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117 String rtn = Long.toString(++id);
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118 if( id > idLim ) {
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119 idLim += idBatch;
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120 LuanTable doc = Luan.newTable();
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121 doc.put( "type", "next_id" );
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122 doc.put( FLD_NEXT_ID, idLim );
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123 writer.updateDocument(newTerm("type","next_id"),toLucene(luan,doc));
230
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124 }
233
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125 return rtn;
230
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126 }
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127
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128
233
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diff changeset
129 public void backup(LuanState luan,String zipFile) throws LuanException, IOException {
230
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130 if( !zipFile.endsWith(".zip") )
233
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131 throw luan.exception("file "+zipFile+" doesn't end with '.zip'");
230
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132 LuceneSnapshot snapshot = openSnapshot();
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133 try {
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134 ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));
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135 for( String fileName : snapshot.getFileNames() ) {
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diff changeset
136 out.putNextEntry(new ZipEntry(fileName));
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137 FileInputStream in = new FileInputStream(new File(indexDir,fileName));
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diff changeset
138 Utils.copyAll(in,out);
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139 in.close();
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diff changeset
140 out.closeEntry();
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141 }
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diff changeset
142 out.close();
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143 } finally {
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144 snapshot.close();
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145 }
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146 }
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147
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148
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149
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150 // luan
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151
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152 public String to_string() {
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153 return writer.getDirectory().toString();
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154 }
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155
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156 public void Writer(LuanState luan,LuanFunction fn) throws LuanException, IOException {
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diff changeset
157 LuceneWriter writer = openWriter();
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diff changeset
158 try {
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diff changeset
159 luan.call( fn, new Object[]{writer.table()} );
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160 writer.commit();
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161 } finally {
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162 writer.close();
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163 }
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164 }
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165
233
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diff changeset
166 public Object Searcher(LuanState luan,LuanFunction fn) throws LuanException, IOException {
232
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167 LuceneSearcher searcher = openSearcher();
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diff changeset
168 try {
233
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diff changeset
169 return luan.call( fn, new Object[]{searcher.table()} );
232
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diff changeset
170 } finally {
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diff changeset
171 searcher.close();
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diff changeset
172 }
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diff changeset
173 }
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diff changeset
174
230
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parents:
diff changeset
175 private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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parents:
diff changeset
176 t.put( method, new LuanJavaFunction(LuceneIndex.class.getMethod(method,parameterTypes),this) );
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177 }
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178
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179 public LuanTable table() {
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180 LuanTable tbl = Luan.newTable();
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diff changeset
181 try {
233
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parents: 232
diff changeset
182 tbl.put("fields",fields);
230
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diff changeset
183 add( tbl, "to_string" );
233
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diff changeset
184 add( tbl, "backup", LuanState.class, String.class );
232
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diff changeset
185 add( tbl, "Writer", LuanState.class, LuanFunction.class );
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diff changeset
186 add( tbl, "Searcher", LuanState.class, LuanFunction.class );
230
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diff changeset
187 } catch(NoSuchMethodException e) {
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diff changeset
188 throw new RuntimeException(e);
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189 }
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190 return tbl;
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191 }
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diff changeset
192
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193 }