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Lucene example source code file (Test2BTerms.java)

This example Lucene source code file (Test2BTerms.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

arraylist, document, io, ioexception, ioexception, list, list, logbytesizemergepolicy, mytokenstream, mytokenstream, string, string, term, termenum, token_len, util

The Lucene Test2BTerms.java source code

package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.util.*;
import org.apache.lucene.store.*;
import org.apache.lucene.search.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.analysis.tokenattributes.*;
import org.apache.lucene.document.*;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.junit.Ignore;

// Best to run this test w/ plenty of RAM (because of the
// terms index):
//
//   ant compile-test
//
//   java -server -Xmx8g -d64 -cp .:lib/junit-4.7.jar:./build/classes/test:./build/classes/test-framework:./build/classes/java -Dlucene.version=4.0-dev -Dtests.directory=MMapDirectory -DtempDir=build -ea org.junit.runner.JUnitCore org.apache.lucene.index.Test2BTerms
//

public class Test2BTerms extends LuceneTestCase {

  private final class MyTokenStream extends TokenStream {

    private final int tokensPerDoc;
    private int tokenCount;
    private final CharTermAttribute charTerm;
    private final static int TOKEN_LEN = 5;
    private final char[] chars;
    public final List<String> savedTerms = new ArrayList();
    private int nextSave;

    public MyTokenStream(int tokensPerDoc) {
      super();
      this.tokensPerDoc = tokensPerDoc;
      charTerm = addAttribute(CharTermAttribute.class);
      chars = charTerm.resizeBuffer(TOKEN_LEN);
      charTerm.setLength(TOKEN_LEN);
      nextSave = _TestUtil.nextInt(random, 500000, 1000000);
    }
    
    @Override
    public boolean incrementToken() {
      if (tokenCount >= tokensPerDoc) {
        return false;
      }
      _TestUtil.randomFixedLengthUnicodeString(random, chars, 0, TOKEN_LEN);
      tokenCount++;
      if (--nextSave == 0) {
        final String s = new String(chars, 0, TOKEN_LEN);
        System.out.println("TEST: save term=" + s + " [" + toHexString(s) + "]");
        savedTerms.add(s);
        nextSave = _TestUtil.nextInt(random, 500000, 1000000);
      }
      return true;
    }

    @Override
    public void reset() {
      tokenCount = 0;
    }
  }

  @Ignore("Takes ~4 hours to run on a fast machine!!")
  public void test2BTerms() throws IOException {

    final long TERM_COUNT = ((long) Integer.MAX_VALUE) + 100000000;

    final int TERMS_PER_DOC = _TestUtil.nextInt(random, 100000, 1000000);

    List<String> savedTerms = null;

    MockDirectoryWrapper dir = newFSDirectory(_TestUtil.getTempDir("2BTerms"));
    dir.setThrottling(MockDirectoryWrapper.Throttling.NEVER);
    dir.setCheckIndexOnClose(false); // don't double-checkindex
    //Directory dir = newFSDirectory(new File("/p/lucene/indices/2bindex"));

    if (true) {

      IndexWriter w = new IndexWriter(dir,
                                      new IndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random))
                                      .setMaxBufferedDocs(IndexWriterConfig.DISABLE_AUTO_FLUSH)
                                      .setRAMBufferSizeMB(256.0)
                                      .setMergeScheduler(new ConcurrentMergeScheduler())
                                      .setMergePolicy(newLogMergePolicy(false, 10))
                                      .setOpenMode(IndexWriterConfig.OpenMode.CREATE));

      MergePolicy mp = w.getConfig().getMergePolicy();
      if (mp instanceof LogByteSizeMergePolicy) {
        // 1 petabyte:
        ((LogByteSizeMergePolicy) mp).setMaxMergeMB(1024*1024*1024);
      }

      Document doc = new Document();

      final MyTokenStream ts = new MyTokenStream(TERMS_PER_DOC);
      Field field = new Field("field", ts);
      field.setOmitTermFreqAndPositions(true);
      field.setOmitNorms(true);
      doc.add(field);
      //w.setInfoStream(System.out);
      final int numDocs = (int) (TERM_COUNT/TERMS_PER_DOC);

      System.out.println("TERMS_PER_DOC=" + TERMS_PER_DOC);
      System.out.println("numDocs=" + numDocs);

      for(int i=0;i<numDocs;i++) {
        final long t0 = System.currentTimeMillis();
        w.addDocument(doc);
        System.out.println(i + " of " + numDocs + " " + (System.currentTimeMillis()-t0) + " msec");
      }
      savedTerms = ts.savedTerms;

      System.out.println("TEST: optimize");
      w.optimize();
      System.out.println("TEST: close writer");
      w.close();
    }

    System.out.println("TEST: open reader");
    final IndexReader r = IndexReader.open(dir);
    if (savedTerms == null) {
      savedTerms = findTerms(r);
    }
    final int numSavedTerms = savedTerms.size();
    final List<String> bigOrdTerms = new ArrayList(savedTerms.subList(numSavedTerms-10, numSavedTerms));
    System.out.println("TEST: test big ord terms...");
    testSavedTerms(r, bigOrdTerms);
    System.out.println("TEST: test all saved terms...");
    testSavedTerms(r, savedTerms);
    r.close();

    System.out.println("TEST: now CheckIndex...");
    CheckIndex.Status status = _TestUtil.checkIndex(dir);
    final long tc = status.segmentInfos.get(0).termIndexStatus.termCount;
    assertTrue("count " + tc + " is not > " + Integer.MAX_VALUE, tc > Integer.MAX_VALUE);
    dir.close();
  }

  private List<String> findTerms(IndexReader r) throws IOException {
    System.out.println("TEST: findTerms");
    final TermEnum termEnum = r.terms();
    final List<String> savedTerms = new ArrayList();
    int nextSave = _TestUtil.nextInt(random, 500000, 1000000);
    while(termEnum.next()) {
      if (--nextSave == 0) {
        savedTerms.add(termEnum.term().text());
        System.out.println("TEST: add " + termEnum.term());
        nextSave = _TestUtil.nextInt(random, 500000, 1000000);
      }
    }
    return savedTerms;
  }

  private String toHexString(String s) {
    byte[] bytes;
    try {
      bytes = s.getBytes("UTF-8");
    } catch (UnsupportedEncodingException uee) {
      throw new RuntimeException(uee);
    }
    StringBuilder sb = new StringBuilder();
    for(byte b : bytes) {
      if (sb.length() > 0) {
        sb.append(' ');
      }
      sb.append(Integer.toHexString(b&0xFF));
    }
    return sb.toString();
  }

  private void testSavedTerms(IndexReader r, List<String> terms) throws IOException {
    System.out.println("TEST: run " + terms.size() + " terms on reader=" + r);
    IndexSearcher s = new IndexSearcher(r);
    Collections.shuffle(terms);
    boolean failed = false;
    for(int iter=0;iter<10*terms.size();iter++) {
      final String term = terms.get(random.nextInt(terms.size()));
      System.out.println("TEST: search " + term + " [" + toHexString(term) + "]");
      final long t0 = System.currentTimeMillis();
      final int count = s.search(new TermQuery(new Term("field", term)), 1).totalHits;
      if (count <= 0) {
        System.out.println("  FAILED: count=" + count);
        failed = true;
      }
      final long t1 = System.currentTimeMillis();
      System.out.println("  took " + (t1-t0) + " millis");

      final TermEnum termEnum = r.terms(new Term("field", term));
      final String text = termEnum.term().text();
      if (!term.equals(text)) {
        System.out.println("  FAILED: wrong term: got " + text + " [" + toHexString(text) + "]");
        failed = true;
      }
    }
    assertFalse(failed);
  }
}

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