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Lucene example source code file (TestTermdocPerf.java)

This example Lucene source code file (TestTermdocPerf.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

analyzer, directory, document, document, indexwriter, io, ioexception, ioexception, override, repeatingtokenstream, repeatingtokenstream, string, string, test_version_current, tokenstream, util

The Lucene TestTermdocPerf.java source code

package org.apache.lucene.index;

/**
 * Copyright 2006 The Apache Software Foundation
 *
 * Licensed 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.io.IOException;
import java.io.Reader;
import java.util.Random;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

class RepeatingTokenStream extends TokenStream {
  public int num;
  CharTermAttribute termAtt;
  String value;

   public RepeatingTokenStream(String val) {
     this.value = val;
     this.termAtt = addAttribute(CharTermAttribute.class);
   }

   @Override
   public boolean incrementToken() throws IOException {
     num--;
     if (num >= 0) {
       clearAttributes();
       termAtt.append(value);
       return true;
     }
     return false;
   }
}


public class TestTermdocPerf extends LuceneTestCase {

  void addDocs(final Random random, Directory dir, final int ndocs, String field, final String val, final int maxTF, final float percentDocs) throws IOException {
    final RepeatingTokenStream ts = new RepeatingTokenStream(val);

    Analyzer analyzer = new Analyzer() {
      @Override
      public TokenStream tokenStream(String fieldName, Reader reader) {
        if (random.nextFloat() < percentDocs) ts.num = random.nextInt(maxTF)+1;
        else ts.num=0;
        return ts;
      }
    };

    Document doc = new Document();
    doc.add(newField(field,val, Field.Store.NO, Field.Index.NOT_ANALYZED_NO_NORMS));
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, analyzer)
        .setOpenMode(OpenMode.CREATE).setMaxBufferedDocs(100));
    ((LogMergePolicy) writer.getConfig().getMergePolicy()).setMergeFactor(100);

    for (int i=0; i<ndocs; i++) {
      writer.addDocument(doc);
    }

    writer.optimize();
    writer.close();
  }


  public int doTest(int iter, int ndocs, int maxTF, float percentDocs) throws IOException {
    Directory dir = newDirectory();

    long start = System.currentTimeMillis();
    addDocs(random, dir, ndocs, "foo", "val", maxTF, percentDocs);
    long end = System.currentTimeMillis();
    if (VERBOSE) System.out.println("milliseconds for creation of " + ndocs + " docs = " + (end-start));

    IndexReader reader = IndexReader.open(dir, true);
    TermEnum tenum = reader.terms(new Term("foo","val"));
    TermDocs tdocs = reader.termDocs();

    start = System.currentTimeMillis();

    int ret=0;
    for (int i=0; i<iter; i++) {
      tdocs.seek(tenum);
      while (tdocs.next()) {
        ret += tdocs.doc();
      }
    }

    end = System.currentTimeMillis();
    if (VERBOSE) System.out.println("milliseconds for " + iter + " TermDocs iteration: " + (end-start));

    return ret;
  }

  public void testTermDocPerf() throws IOException {
    // performance test for 10% of documents containing a term
    // doTest(100000, 10000,3,.1f);
  }


}

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