Lucene example source code file (TestNRTCachingDirectory.java)

This example Lucene source code file (TestNRTCachingDirectory.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

directory, directory, exception, exception, indexreader, indexsearcher, indexsearcher, indexwriter, indexwriterconfig, io, linefiledocs, nrtcachingdirectory, nrtcachingdirectory, randomindexwriter, term, util

The Lucene TestNRTCachingDirectory.java source code

package org.apache.lucene.store;

/**
 * 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.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.util.LineFileDocs;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.Version;
import org.apache.lucene.util._TestUtil;

public class TestNRTCachingDirectory extends LuceneTestCase {

  public void testNRTAndCommit() throws Exception {
    Directory dir = newDirectory();
    NRTCachingDirectory cachedDir = new NRTCachingDirectory(dir, 2.0, 25.0);
    IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random));
    conf.setMergeScheduler(cachedDir.getMergeScheduler());
    RandomIndexWriter w = new RandomIndexWriter(random, cachedDir, conf);
    w.w.setInfoStream(VERBOSE ? System.out : null);
    final LineFileDocs docs = new LineFileDocs(random);    
    final int numDocs = _TestUtil.nextInt(random, 100, 400);

    if (VERBOSE) {
      System.out.println("TEST: numDocs=" + numDocs);
    }

    final List<String> ids = new ArrayList();
    IndexReader r = null;
    for(int docCount=0;docCount<numDocs;docCount++) {
      final Document doc = docs.nextDoc();
      ids.add(new String(doc.get("docid")));
      w.addDocument(doc);
      if (random.nextInt(20) == 17) {
        if (r == null) {
          r = IndexReader.open(w.w, false);
        } else {
          final IndexReader r2 = r.reopen();
          if (r2 != r) {
            r.close();
            r = r2;
          }
        }
        assertEquals(1+docCount, r.numDocs());
        final IndexSearcher s = new IndexSearcher(r);
        // Just make sure search can run; we can't assert
        // totHits since it could be 0
        TopDocs hits = s.search(new TermQuery(new Term("body", "the")), 10);
        // System.out.println("tot hits " + hits.totalHits);
      }
    }

    if (r != null) {
      r.close();
    }

    // Close should force cache to clear since all files are sync'd
    w.close();

    final String[] cachedFiles = cachedDir.listCachedFiles();
    for(String file : cachedFiles) {
      System.out.println("FAIL: cached file " + file + " remains after sync");
    }
    assertEquals(0, cachedFiles.length);
    
    r = IndexReader.open(dir);
    for(String id : ids) {
      assertEquals(1, r.docFreq(new Term("docid", id)));
    }
    r.close();
    cachedDir.close();
  }

  // NOTE: not a test; just here to make sure the code frag
  // in the javadocs is correct!
  public void verifyCompiles() throws Exception {
    Analyzer analyzer = null;

    Directory fsDir = FSDirectory.open(new File("/path/to/index"));
    NRTCachingDirectory cachedFSDir = new NRTCachingDirectory(fsDir, 2.0, 25.0);
    IndexWriterConfig conf = new IndexWriterConfig(Version.LUCENE_32, analyzer);
    conf.setMergeScheduler(cachedFSDir.getMergeScheduler());
    IndexWriter writer = new IndexWriter(cachedFSDir, conf);
  }

  public void testDeleteFile() throws Exception {
    Directory dir = new NRTCachingDirectory(newDirectory(), 2.0, 25.0);
    dir.createOutput("foo.txt").close();
    dir.deleteFile("foo.txt");
    assertEquals(0, dir.listAll().length);
    dir.close();
  }
}