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Lucene example source code file (TestSearchWithThreads.java)

This example Lucene source code file (TestSearchWithThreads.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, atomiclong, document, exception, num_search_threads, run_time_msec, stringbuilder, term, termquery, termquery, thread, thread, totalhitcountcollector, totalhitcountcollector

The Lucene TestSearchWithThreads.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,
 * 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 java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestSearchWithThreads extends LuceneTestCase {
  
  final int NUM_DOCS = atLeast(10000);
  final int NUM_SEARCH_THREADS = 5;
  final int RUN_TIME_MSEC = atLeast(1000);

  public void test() throws Exception {
    final Directory dir = newDirectory();
    final RandomIndexWriter w = new RandomIndexWriter(random, dir);

    final long startTime = System.currentTimeMillis();

    // TODO: replace w/ the @nightly test data; make this
    // into an optional @nightly stress test
    final Document doc = new Document();
    final Field body = newField("body", "", Field.Index.ANALYZED);
    doc.add(body);
    final StringBuilder sb = new StringBuilder();
    for(int docCount=0;docCount<NUM_DOCS;docCount++) {
      final int numTerms = random.nextInt(10);
      for(int termCount=0;termCount<numTerms;termCount++) {
        sb.append(random.nextBoolean() ? "aaa" : "bbb");
        sb.append(' ');
      }
      body.setValue(sb.toString());
      w.addDocument(doc);
      sb.delete(0, sb.length());
    }
    final IndexReader r = w.getReader();
    w.close();

    final long endTime = System.currentTimeMillis();
    if (VERBOSE) System.out.println("BUILD took " + (endTime-startTime));

    final IndexSearcher s = newSearcher(r);

    final AtomicBoolean failed = new AtomicBoolean();
    final AtomicLong netSearch = new AtomicLong();

    Thread[] threads = new Thread[NUM_SEARCH_THREADS];
    for (int threadID = 0; threadID < NUM_SEARCH_THREADS; threadID++) {
      threads[threadID] = new Thread() {
        TotalHitCountCollector col = new TotalHitCountCollector();
          @Override
          public void run() {
            try {
              long totHits = 0;
              long totSearch = 0;
              long stopAt = System.currentTimeMillis() + RUN_TIME_MSEC;
              while(System.currentTimeMillis() < stopAt && !failed.get()) {
                s.search(new TermQuery(new Term("body", "aaa")), col);
                totHits += col.getTotalHits();
                s.search(new TermQuery(new Term("body", "bbb")), col);
                totHits += col.getTotalHits();
                totSearch++;
              }
              assertTrue(totSearch > 0 && totHits > 0);
              netSearch.addAndGet(totSearch);
            } catch (Exception exc) {
              failed.set(true);
              throw new RuntimeException(exc);
            }
          }
        };
      threads[threadID].setDaemon(true);
    }

    for (Thread t : threads) {
      t.start();
    }
    
    for (Thread t : threads) {
      t.join();
    }

    if (VERBOSE) System.out.println(NUM_SEARCH_THREADS + " threads did " + netSearch.get() + " searches");

    s.close();
    r.close();
    dir.close();
  }
}

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