Mercurial Hosting > luan
view lucene/src/luan/modules/lucene/LuceneIndex.java @ 527:ef0336efe33c
minor
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 27 May 2015 03:29:04 -0600 |
parents | 70bda9184158 |
children | c5a93767cc5c |
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package luan.modules.lucene; import java.io.Closeable; import java.io.File; import java.io.FileOutputStream; import java.io.FileInputStream; import java.io.IOException; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; import java.util.zip.ZipOutputStream; import java.util.zip.ZipEntry; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.index.DirectoryReader; import org.apache.lucene.index.Term; import org.apache.lucene.index.SnapshotDeletionPolicy; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; import org.apache.lucene.search.Query; import org.apache.lucene.search.TermQuery; import org.apache.lucene.search.TopDocs; import org.apache.lucene.queryparser.flexible.standard.StandardQueryParser; import org.apache.lucene.queryparser.flexible.core.QueryNodeException; import luan.modules.Utils; import luan.Luan; import luan.LuanState; import luan.LuanTable; import luan.LuanFunction; import luan.LuanJavaFunction; import luan.LuanException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public final class LuceneIndex implements Closeable { private static final Logger logger = LoggerFactory.getLogger(LuceneIndex.class); private static final String FLD_NEXT_ID = "nextId"; final Lock writeLock = new ReentrantLock(); private final File indexDir; final SnapshotDeletionPolicy snapshotDeletionPolicy; final IndexWriter writer; private DirectoryReader reader; private LuceneSearcher searcher; public final FieldTable fields = new FieldTable(); private boolean isClosed = false; public LuceneIndex(LuanState luan,String indexDirStr) throws LuanException, IOException { File indexDir = new File(indexDirStr); this.indexDir = indexDir; Directory dir = FSDirectory.open(indexDir); Version version = Version.LUCENE_4_9; Analyzer analyzer = new StandardAnalyzer(version); IndexWriterConfig conf = new IndexWriterConfig(version,analyzer); snapshotDeletionPolicy = new SnapshotDeletionPolicy(conf.getIndexDeletionPolicy()); conf.setIndexDeletionPolicy(snapshotDeletionPolicy); writer = new IndexWriter(dir,conf); writer.commit(); // commit index creation reader = DirectoryReader.open(dir); luan.onClose(this); searcher = new LuceneSearcher(this,reader); initId(luan); } Document toLucene(LuanState luan,LuanTable table) throws LuanException { return LuceneDocument.toLucene(luan,table,fields.map); } LuanTable toTable(LuanState luan,Document doc) throws LuanException { return LuceneDocument.toTable(luan,doc,fields.reverseMap); } public String map_field_name(String fld) { String s = fields.map.get(fld); return s!=null ? s : fld; } Term newTerm(String fld,String text) { return new Term(map_field_name(fld),text); } public LuceneWriter openWriter() { return new LuceneWriter(this); } synchronized LuceneSearcher openSearcher() throws IOException { DirectoryReader newReader = DirectoryReader.openIfChanged(reader); if( newReader != null ) { reader.decRef(); reader = newReader; searcher = new LuceneSearcher(this,reader); } reader.incRef(); return searcher; } LuceneSnapshot openSnapshot() throws IOException { return new LuceneSnapshot(this); } public void delete_all() throws IOException { writeLock.lock(); try { writer.deleteAll(); writer.commit(); id = idLim = 0; } finally { writeLock.unlock(); } } private long id = 0; private long idLim = 0; private final int idBatch = 10; private void initId(LuanState luan) throws LuanException, IOException { TopDocs td = searcher.search(new TermQuery(newTerm("type","next_id")),1); switch(td.totalHits) { case 0: break; // do nothing case 1: LuanTable doc = searcher.doc(luan,td.scoreDocs[0].doc); idLim = (Long)doc.rawGet(FLD_NEXT_ID); id = idLim; break; default: throw new RuntimeException(); } } synchronized String nextId(LuanState luan) throws LuanException, IOException { String rtn = Long.toString(++id); if( id > idLim ) { idLim += idBatch; LuanTable doc = new LuanTable(); doc.rawPut( "type", "next_id" ); doc.rawPut( FLD_NEXT_ID, idLim ); writer.updateDocument(newTerm("type","next_id"),toLucene(luan,doc)); } return rtn; } public void backup(LuanState luan,String zipFile) throws LuanException, IOException { if( !zipFile.endsWith(".zip") ) throw luan.exception("file "+zipFile+" doesn't end with '.zip'"); LuceneSnapshot snapshot = openSnapshot(); try { ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile)); for( String fileName : snapshot.getFileNames() ) { out.putNextEntry(new ZipEntry(fileName)); FileInputStream in = new FileInputStream(new File(indexDir,fileName)); Utils.copyAll(in,out); in.close(); out.closeEntry(); } out.close(); } finally { snapshot.close(); } } // luan public String to_string() { return writer.getDirectory().toString(); } public void Writer(LuanState luan,LuanFunction fn) throws LuanException, IOException { LuceneWriter writer = openWriter(); try { luan.call( fn, new Object[]{writer.table()} ); writer.commit(); } finally { writer.close(); } } public Object Searcher(LuanState luan,LuanFunction fn) throws LuanException, IOException { LuceneSearcher searcher = openSearcher(); try { return luan.call( fn, new Object[]{searcher.table()} ); } finally { searcher.close(); } } public void close() throws IOException { if( !isClosed ) { writer.close(); reader.close(); isClosed = true; } } protected void finalize() throws Throwable { if( !isClosed ) { logger.error("not closed"); close(); } super.finalize(); } public Query parse(String s) throws QueryNodeException { StandardQueryParser qp = new StandardQueryParser(); qp.setQueryNodeProcessor(new LuanQueryNodeProcessor(this,qp.getQueryNodeProcessor())); return qp.parse(s,null); } }