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Apache Lucene (module: benchmark)
There is a newer version: 9.11.1
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 java.io.IOException;
import java.util.Collection;
import java.util.Map;

import org.apache.lucene.benchmark.byTask.PerfRunData;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexCommit;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;

/**
 * Open an index reader.
 * 
Other side effects: index reader object in perfRunData is set.
 * 
 Optional params commitUserData eg. OpenReader(false,commit1)
 */
public class OpenReaderTask extends PerfTask {
  public static final String USER_DATA = "userData";
  private String commitUserData = null;

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

  @Override
  public int doLogic() throws IOException {
    Directory dir = getRunData().getDirectory();
    DirectoryReader r = null;
    if (commitUserData != null) {
      r = DirectoryReader.open(OpenReaderTask.findIndexCommit(dir, commitUserData)); 
    } else {
      r = DirectoryReader.open(dir); 
    }
    getRunData().setIndexReader(r);
    // We transfer reference to the run data
    r.decRef();
    return 1;
  }
 
  @Override
  public void setParams(String params) {
    super.setParams(params);
    if (params != null) {
      String[] split = params.split(",");
      if (split.length > 0) {
        commitUserData = split[0];
      }
    }
  }

  @Override
  public boolean supportsParams() {
    return true;
  }

  public static IndexCommit findIndexCommit(Directory dir, String userData) throws IOException {
    Collection commits = DirectoryReader.listCommits(dir);
    for (final IndexCommit ic : commits) {
      Map map = ic.getUserData();
      String ud = null;
      if (map != null) {
        ud = map.get(USER_DATA);
      }
      if (ud != null && ud.equals(userData)) {
        return ic;
      }
    }

    throw new IOException("index does not contain commit with userData: " + userData);
  }
}