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Lucene example source code file (TestIndexFileDeleter.java)

This example Lucene source code file (TestIndexFileDeleter.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

compoundfilereader, document, fieldinfos, hashset, indexwriter, indexwriter, io, ioexception, ioexception, iterator, set, set, string, string, term, util

The Lucene TestIndexFileDeleter.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.LuceneTestCase;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.store.MockDirectoryWrapper;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;

import java.io.*;
import java.util.*;

/*
  Verify we can read the pre-2.1 file format, do searches
  against it, and add documents to it.
*/

public class TestIndexFileDeleter extends LuceneTestCase {
  
  public void testDeleteLeftoverFiles() throws IOException {
    MockDirectoryWrapper dir = newDirectory();
    dir.setPreventDoubleWrite(false);
    IndexWriterConfig conf = newIndexWriterConfig(
        TEST_VERSION_CURRENT, new WhitespaceAnalyzer(TEST_VERSION_CURRENT))
        .setMaxBufferedDocs(10);
    LogMergePolicy mergePolicy = newLogMergePolicy(true, 10);
    mergePolicy.setNoCFSRatio(1); // This test expects all of its segments to be in CFS
    conf.setMergePolicy(mergePolicy);

    IndexWriter writer = new IndexWriter(
        dir,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setMaxBufferedDocs(10).
            setMergePolicy(mergePolicy)
    );

    writer.setInfoStream(VERBOSE ? System.out : null);

    int i;
    for(i=0;i<35;i++) {
      addDoc(writer, i);
    }
    mergePolicy.setUseCompoundFile(false);
    for(;i<45;i++) {
      addDoc(writer, i);
    }
    writer.close();

    // Delete one doc so we get a .del file:
    IndexReader reader = IndexReader.open(dir, false);
    Term searchTerm = new Term("id", "7");
    int delCount = reader.deleteDocuments(searchTerm);
    assertEquals("didn't delete the right number of documents", 1, delCount);

    // Set one norm so we get a .s0 file:
    reader.setNorm(21, "content", (float) 1.5);
    reader.close();

    // Now, artificially create an extra .del file & extra
    // .s0 file:
    String[] files = dir.listAll();

    /*
    for(int j=0;j<files.length;j++) {
      System.out.println(j + ": " + files[j]);
    }
    */

    // The numbering of fields can vary depending on which
    // JRE is in use.  On some JREs we see content bound to
    // field 0; on others, field 1.  So, here we have to
    // figure out which field number corresponds to
    // "content", and then set our expected file names below
    // accordingly:
    CompoundFileReader cfsReader = new CompoundFileReader(dir, "_2.cfs");
    FieldInfos fieldInfos = new FieldInfos(cfsReader, "_2.fnm");
    int contentFieldIndex = -1;
    for(i=0;i<fieldInfos.size();i++) {
      FieldInfo fi = fieldInfos.fieldInfo(i);
      if (fi.name.equals("content")) {
        contentFieldIndex = i;
        break;
      }
    }
    cfsReader.close();
    assertTrue("could not locate the 'content' field number in the _2.cfs segment", contentFieldIndex != -1);

    String normSuffix = "s" + contentFieldIndex;

    // Create a bogus separate norms file for a
    // segment/field that actually has a separate norms file
    // already:
    copyFile(dir, "_2_1." + normSuffix, "_2_2." + normSuffix);

    // Create a bogus separate norms file for a
    // segment/field that actually has a separate norms file
    // already, using the "not compound file" extension:
    copyFile(dir, "_2_1." + normSuffix, "_2_2.f" + contentFieldIndex);

    // Create a bogus separate norms file for a
    // segment/field that does not have a separate norms
    // file already:
    copyFile(dir, "_2_1." + normSuffix, "_1_1." + normSuffix);

    // Create a bogus separate norms file for a
    // segment/field that does not have a separate norms
    // file already using the "not compound file" extension:
    copyFile(dir, "_2_1." + normSuffix, "_1_1.f" + contentFieldIndex);

    // Create a bogus separate del file for a
    // segment that already has a separate del file: 
    copyFile(dir, "_0_1.del", "_0_2.del");

    // Create a bogus separate del file for a
    // segment that does not yet have a separate del file:
    copyFile(dir, "_0_1.del", "_1_1.del");

    // Create a bogus separate del file for a
    // non-existent segment:
    copyFile(dir, "_0_1.del", "_188_1.del");

    // Create a bogus segment file:
    copyFile(dir, "_0.cfs", "_188.cfs");

    // Create a bogus fnm file when the CFS already exists:
    copyFile(dir, "_0.cfs", "_0.fnm");
    
    // Create a deletable file:
    copyFile(dir, "_0.cfs", "deletable");

    // Create some old segments file:
    copyFile(dir, "segments_2", "segments");
    copyFile(dir, "segments_2", "segments_1");

    // Create a bogus cfs file shadowing a non-cfs segment:
    assertTrue(dir.fileExists("_3.fdt"));
    assertTrue(!dir.fileExists("_3.cfs"));
    copyFile(dir, "_1.cfs", "_3.cfs");
    
    String[] filesPre = dir.listAll();

    // Open & close a writer: it should delete the above 4
    // files and nothing more:
    writer = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.APPEND));
    writer.close();

    String[] files2 = dir.listAll();
    dir.close();

    Arrays.sort(files);
    Arrays.sort(files2);
    
    Set<String> dif = difFiles(files, files2);
    
    if (!Arrays.equals(files, files2)) {
      fail("IndexFileDeleter failed to delete unreferenced extra files: should have deleted " + (filesPre.length-files.length) + " files but only deleted " + (filesPre.length - files2.length) + "; expected files:\n    " + asString(files) + "\n  actual files:\n    " + asString(files2)+"\ndif: "+dif);
    }
  }

  private static Set<String> difFiles(String[] files1, String[] files2) {
    Set<String> set1 = new HashSet();
    Set<String> set2 = new HashSet();
    Set<String> extra = new HashSet();
    
    for (int x=0; x < files1.length; x++) {
      set1.add(files1[x]);
    }
    for (int x=0; x < files2.length; x++) {
      set2.add(files2[x]);
    }
    Iterator<String> i1 = set1.iterator();
    while (i1.hasNext()) {
      String o = i1.next();
      if (!set2.contains(o)) {
        extra.add(o);
      }
    }
    Iterator<String> i2 = set2.iterator();
    while (i2.hasNext()) {
      String o = i2.next();
      if (!set1.contains(o)) {
        extra.add(o);
      }
    }
    return extra;
  }
  
  private String asString(String[] l) {
    String s = "";
    for(int i=0;i<l.length;i++) {
      if (i > 0) {
        s += "\n    ";
      }
      s += l[i];
    }
    return s;
  }

  public void copyFile(Directory dir, String src, String dest) throws IOException {
    IndexInput in = dir.openInput(src);
    IndexOutput out = dir.createOutput(dest);
    byte[] b = new byte[1024];
    long remainder = in.length();
    while(remainder > 0) {
      int len = (int) Math.min(b.length, remainder);
      in.readBytes(b, 0, len);
      out.writeBytes(b, len);
      remainder -= len;
    }
    in.close();
    out.close();
  }

  private void addDoc(IndexWriter writer, int id) throws IOException
  {
    Document doc = new Document();
    doc.add(newField("content", "aaa", Field.Store.NO, Field.Index.ANALYZED));
    doc.add(newField("id", Integer.toString(id), Field.Store.YES, Field.Index.NOT_ANALYZED));
    writer.addDocument(doc);
  }
}

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