java使用lucene改进多线程索引

3 月，3 周 Questions & Answers 13371

我正在尝试用多个线程在Lucene中构建索引。因此，我开始编写代码，并编写了以下代码。首先我找到文件，然后为每个文件创建一个线程来索引它。之后，我加入线程并优化索引。它是有效的，但我不确定。。。我能大规模信任它吗？有什么办法可以改进吗

import java.io.File;
import java.io.FileFilter;
import java.io.FileReader;
import java.io.IOException;
import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Document;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.StopAnalyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.apache.lucene.index.TermFreqVector;

public class mIndexer extends Thread {

    private File ifile;
    private static IndexWriter writer;

    public mIndexer(File f) {
    ifile = f.getAbsoluteFile();
    }

    public static void main(String args[]) throws Exception {
    System.out.println("here...");

    String indexDir;
        String dataDir;
    if (args.length != 2) {
        dataDir = new String("/home/omid/Ranking/docs/");
        indexDir = new String("/home/omid/Ranking/indexes/");
    }
    else {
        dataDir = args[0];
        indexDir = args[1];
    }

    long start = System.currentTimeMillis();

    Directory dir = FSDirectory.open(new File(indexDir));
    writer = new IndexWriter(dir,
    new StopAnalyzer(Version.LUCENE_34, new File("/home/omid/Desktop/stopwords.txt")),
    true,
    IndexWriter.MaxFieldLength.UNLIMITED);
    int numIndexed = 0;
    try {
        numIndexed = index(dataDir, new TextFilesFilter());
    } finally {
        long end = System.currentTimeMillis();
        System.out.println("Indexing " + numIndexed + " files took " + (end - start) + " milliseconds");
        writer.optimize();
        System.out.println("Optimization took place in " + (System.currentTimeMillis() - end) + " milliseconds");
        writer.close();
    }
    System.out.println("Enjoy your day/night");
    }

    public static int index(String dataDir, FileFilter filter) throws Exception {
    File[] dires = new File(dataDir).listFiles();
    for (File d: dires) {
        if (d.isDirectory()) {
        File[] files = new File(d.getAbsolutePath()).listFiles();
        for (File f: files) {
            if (!f.isDirectory() &&
            !f.isHidden() &&
            f.exists() &&
            f.canRead() &&
            (filter == null || filter.accept(f))) {
                Thread t = new mIndexer(f);
                t.start();
                t.join();
            }
        }
        }
    }
    return writer.numDocs();
    }

    private static class TextFilesFilter implements FileFilter {
    public boolean accept(File path) {
        return path.getName().toLowerCase().endsWith(".txt");
    }
    }

    protected Document getDocument() throws Exception {
    Document doc = new Document();
    if (ifile.exists()) {
        doc.add(new Field("contents", new FileReader(ifile), Field.TermVector.YES));
        doc.add(new Field("path", ifile.getAbsolutePath(), Field.Store.YES, Field.Index.NOT_ANALYZED));
        String cat = "WIR";
        cat = ifile.getAbsolutePath().substring(0, ifile.getAbsolutePath().length()-ifile.getName().length()-1);
        cat = cat.substring(cat.lastIndexOf('/')+1, cat.length());
        //doc.add(new Field("category", cat.subSequence(0, cat.length()), Field.Store.YES));
        //System.out.println(cat.subSequence(0, cat.length()));
    }
    return doc;
    }

    public void run() {
    try {
        System.out.println("Indexing " + ifile.getAbsolutePath());
        Document doc = getDocument();
        writer.addDocument(doc);
    } catch (Exception e) {
        System.out.println(e.toString());
    }

    }
}

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