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Lucene example source code file (TestThreadSafe.java)

This example Lucene source code file (TestThreadSafe.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

atomicboolean, atomicboolean, document, document, exception, indexwriter, io, ioexception, ioexception, random, runtimeexception, string, stringbuilder, thr, thr, util

The Lucene TestThreadSafe.java source code

package org.apache.lucene.search;
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.store.Directory;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.*;

import java.util.Random;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import java.io.IOException;

public class TestThreadSafe extends LuceneTestCase {
  Directory dir1;

  IndexReader ir1;

  class Thr extends Thread {
    final int iter;
    final Random rand;
    final AtomicBoolean failed;

    // pass in random in case we want to make things reproducable
    public Thr(int iter, Random rand, AtomicBoolean failed) {
      this.iter = iter;
      this.rand = rand;
      this.failed = failed;

    public void run() {
      try {
        for (int i=0; i<iter; i++) {
          /*** future
           // pick a random index reader... a shared one, or create your own
           IndexReader ir;

          switch(rand.nextInt(1)) {
            case 0: loadDoc(ir1); break;

      } catch (Throwable th) {
        throw new RuntimeException(th);

    void loadDoc(IndexReader ir) throws IOException {
      // beware of deleted docs in the future
      Document doc = ir.document(rand.nextInt(ir.maxDoc()),
                new FieldSelector() {
                  public FieldSelectorResult accept(String fieldName) {
                    switch(rand.nextInt(2)) {
                      case 0: return FieldSelectorResult.LAZY_LOAD;
                      case 1: return FieldSelectorResult.LOAD;
                      // TODO: add other options
                      default: return FieldSelectorResult.LOAD;

      List<Fieldable> fields = doc.getFields();
      for (final Fieldable f : fields ) {



  void validateField(Fieldable f) {
    String val = f.stringValue();
    if (!val.startsWith("^") || !val.endsWith("$")) {
      throw new RuntimeException("Invalid field:" + f.toString() + " val=" +val);

  String[] words = "now is the time for all good men to come to the aid of their country".split(" ");

  void buildDir(Directory dir, int nDocs, int maxFields, int maxFieldLen) throws IOException {
    IndexWriter iw = new IndexWriter(dir, new IndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.CREATE).setMaxBufferedDocs(10));
    for (int j=0; j<nDocs; j++) {
      Document d = new Document();
      int nFields = random.nextInt(maxFields);
      for (int i=0; i<nFields; i++) {
        int flen = random.nextInt(maxFieldLen);
        StringBuilder sb = new StringBuilder("^ ");
        while (sb.length() < flen) sb.append(' ').append(words[random.nextInt(words.length)]);
        sb.append(" $");
        Field.Store store = Field.Store.YES;  // make random later
        Field.Index index = Field.Index.ANALYZED;  // make random later
        d.add(newField("f"+i, sb.toString(), store, index));

  void doTest(int iter, int nThreads) throws Exception {
    Thr[] tarr = new Thr[nThreads];
    AtomicBoolean failed = new AtomicBoolean();
    for (int i=0; i<nThreads; i++) {
      tarr[i] = new Thr(iter, new Random(random.nextLong()), failed);
    for (int i=0; i<nThreads; i++) {

  public void testLazyLoadThreadSafety() throws Exception{
    dir1 = newDirectory();
    // test w/ field sizes bigger than the buffer of an index input
    buildDir(dir1, 15, 5, 2000);

    // do many small tests so the thread locals go away inbetween
    int num = 10 * RANDOM_MULTIPLIER;
    for (int i = 0; i < num; i++) {
      ir1 = IndexReader.open(dir1, false);


Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene TestThreadSafe.java source code file:

my book on functional programming


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