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Lucene example source code file (CreateIndexTask.java)

This example Lucene source code file (CreateIndexTask.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

exception, indexdeletionpolicy, indexwriter, indexwriterconfig, indexwriterconfig, io, ioexception, logmergepolicy, perfrundata, perfrundata, runtimeexception, string, string, tieredmergepolicy, tieredmergepolicy

The Lucene CreateIndexTask.java source code

package org.apache.lucene.benchmark.byTask.tasks;

/**
 * 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.benchmark.byTask.PerfRunData;
import org.apache.lucene.benchmark.byTask.utils.Config;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexCommit;
import org.apache.lucene.index.IndexDeletionPolicy;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.LogMergePolicy;
import org.apache.lucene.index.MergeScheduler;
import org.apache.lucene.index.ConcurrentMergeScheduler;
import org.apache.lucene.index.MergePolicy;
import org.apache.lucene.index.NoDeletionPolicy;
import org.apache.lucene.index.NoMergePolicy;
import org.apache.lucene.index.NoMergeScheduler;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.index.TieredMergePolicy;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.util.Version;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

/**
 * Create an index. <br>
 * Other side effects: index writer object in perfRunData is set. <br>
 * Relevant properties: <code>merge.factor (default 10),
 * max.buffered (default no flush), max.field.length (default
 * 10,000 tokens), max.field.length, compound (default true), ram.flush.mb [default 0],
 * merge.policy (default org.apache.lucene.index.LogByteSizeMergePolicy),
 * merge.scheduler (default
 * org.apache.lucene.index.ConcurrentMergeScheduler),
 * concurrent.merge.scheduler.max.thread.count and
 * concurrent.merge.scheduler.max.merge.count (defaults per
 * ConcurrentMergeScheduler) </code>.
 * <p>
 * This task also supports a "writer.info.stream" property with the following
 * values:
 * <ul>
 * <li>SystemOut - sets {@link IndexWriter#setInfoStream(java.io.PrintStream)}
 * to {@link System#out}.
 * <li>SystemErr - sets {@link IndexWriter#setInfoStream(java.io.PrintStream)}
 * to {@link System#err}.
 * <li><file_name> - attempts to create a file given that name and sets
 * {@link IndexWriter#setInfoStream(java.io.PrintStream)} to that file. If this
 * denotes an invalid file name, or some error occurs, an exception will be
 * thrown.
 * </ul>
 */
public class CreateIndexTask extends PerfTask {

  public CreateIndexTask(PerfRunData runData) {
    super(runData);
  }

  
  
  public static IndexDeletionPolicy getIndexDeletionPolicy(Config config) {
    String deletionPolicyName = config.get("deletion.policy", "org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy");
    if (deletionPolicyName.equals(NoDeletionPolicy.class.getName())) {
      return NoDeletionPolicy.INSTANCE;
    } else {
      try {
        return Class.forName(deletionPolicyName).asSubclass(IndexDeletionPolicy.class).newInstance();
      } catch (Exception e) {
        throw new RuntimeException("unable to instantiate class '" + deletionPolicyName + "' as IndexDeletionPolicy", e);
      }
    }
  }
  
  @Override
  public int doLogic() throws IOException {
    PerfRunData runData = getRunData();
    Config config = runData.getConfig();
    runData.setIndexWriter(configureWriter(config, runData, OpenMode.CREATE, null));
    return 1;
  }
  
  public static IndexWriterConfig createWriterConfig(Config config, PerfRunData runData, OpenMode mode, IndexCommit commit) {
    Version version = Version.valueOf(config.get("writer.version", Version.LUCENE_31.toString()));
    IndexWriterConfig iwConf = new IndexWriterConfig(version, runData.getAnalyzer());
    iwConf.setOpenMode(mode);
    IndexDeletionPolicy indexDeletionPolicy = getIndexDeletionPolicy(config);
    iwConf.setIndexDeletionPolicy(indexDeletionPolicy);
    if(commit != null)
      iwConf.setIndexCommit(commit);
    

    final String mergeScheduler = config.get("merge.scheduler",
                                             "org.apache.lucene.index.ConcurrentMergeScheduler");
    if (mergeScheduler.equals(NoMergeScheduler.class.getName())) {
      iwConf.setMergeScheduler(NoMergeScheduler.INSTANCE);
    } else {
      try {
        iwConf.setMergeScheduler(Class.forName(mergeScheduler).asSubclass(MergeScheduler.class).newInstance());
      } catch (Exception e) {
        throw new RuntimeException("unable to instantiate class '" + mergeScheduler + "' as merge scheduler", e);
      }
      
      if (mergeScheduler.equals("org.apache.lucene.index.ConcurrentMergeScheduler")) {
        ConcurrentMergeScheduler cms = (ConcurrentMergeScheduler) iwConf.getMergeScheduler();
        int v = config.get("concurrent.merge.scheduler.max.thread.count", -1);
        if (v != -1) {
          cms.setMaxThreadCount(v);
        }
        v = config.get("concurrent.merge.scheduler.max.merge.count", -1);
        if (v != -1) {
          cms.setMaxMergeCount(v);
        }
      }
    }

    final String mergePolicy = config.get("merge.policy",
                                          "org.apache.lucene.index.LogByteSizeMergePolicy");
    boolean isCompound = config.get("compound", true);
    if (mergePolicy.equals(NoMergePolicy.class.getName())) {
      iwConf.setMergePolicy(isCompound ? NoMergePolicy.COMPOUND_FILES : NoMergePolicy.NO_COMPOUND_FILES);
    } else {
      try {
        iwConf.setMergePolicy(Class.forName(mergePolicy).asSubclass(MergePolicy.class).newInstance());
      } catch (Exception e) {
        throw new RuntimeException("unable to instantiate class '" + mergePolicy + "' as merge policy", e);
      }
      if(iwConf.getMergePolicy() instanceof LogMergePolicy) {
        LogMergePolicy logMergePolicy = (LogMergePolicy) iwConf.getMergePolicy();
        logMergePolicy.setUseCompoundFile(isCompound);
        logMergePolicy.setMergeFactor(config.get("merge.factor",OpenIndexTask.DEFAULT_MERGE_PFACTOR));
      } else if(iwConf.getMergePolicy() instanceof TieredMergePolicy) {
        TieredMergePolicy tieredMergePolicy = (TieredMergePolicy) iwConf.getMergePolicy();
        tieredMergePolicy.setUseCompoundFile(isCompound);
      }
    }
    final double ramBuffer = config.get("ram.flush.mb",OpenIndexTask.DEFAULT_RAM_FLUSH_MB);
    final int maxBuffered = config.get("max.buffered",OpenIndexTask.DEFAULT_MAX_BUFFERED);
    if (maxBuffered == IndexWriterConfig.DISABLE_AUTO_FLUSH) {
      iwConf.setRAMBufferSizeMB(ramBuffer);
      iwConf.setMaxBufferedDocs(maxBuffered);
    } else {
      iwConf.setMaxBufferedDocs(maxBuffered);
      iwConf.setRAMBufferSizeMB(ramBuffer);
    }
    
    return iwConf;
  }
  
  public static IndexWriter configureWriter(Config config, PerfRunData runData, OpenMode mode, IndexCommit commit) throws CorruptIndexException, LockObtainFailedException, IOException {
    IndexWriter writer = new IndexWriter(runData.getDirectory(), createWriterConfig(config, runData, mode, commit));
    writer.setMaxFieldLength(config.get("max.field.length", OpenIndexTask.DEFAULT_MAX_FIELD_LENGTH));

    String infoStreamVal = config.get("writer.info.stream", null);
    if (infoStreamVal != null) {
      if (infoStreamVal.equals("SystemOut")) {
        writer.setInfoStream(System.out);
      } else if (infoStreamVal.equals("SystemErr")) {
        writer.setInfoStream(System.err);
      } else {
        File f = new File(infoStreamVal).getAbsoluteFile();
        writer.setInfoStream(new PrintStream(new BufferedOutputStream(new FileOutputStream(f))));
      }
    }
    return writer;
  }
}

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