/*
 * 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.
 */

package org.apache.lucene.index;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;
import org.apache.lucene.tests.util.TestUtil;
import org.apache.lucene.util.IOUtils;

public class TestIndexManyDocuments extends LuceneTestCase {

  public void test() throws Exception {
    Directory dir = newFSDirectory(createTempDir());
    IndexWriterConfig iwc = new IndexWriterConfig();
    iwc.setMaxBufferedDocs(TestUtil.nextInt(random(), 100, 2000));

    int numDocs = atLeast(10000);

    final IndexWriter w = new IndexWriter(dir, iwc);
    final AtomicInteger count = new AtomicInteger();
    Thread[] threads = new Thread[2];
    for (int i = 0; i < threads.length; i++) {
      threads[i] =
          new Thread() {
            @Override
            public void run() {
              while (count.getAndIncrement() < numDocs) {
                Document doc = new Document();
                doc.add(newTextField("field", "text", Field.Store.NO));
                try {
                  w.addDocument(doc);
                } catch (IOException ioe) {
                  throw new RuntimeException(ioe);
                }
              }
            }
          };
      threads[i].start();
    }

    for (Thread thread : threads) {
      thread.join();
    }

    assertEquals(
        "lost "
            + (numDocs - w.getDocStats().maxDoc)
            + " documents; maxBufferedDocs="
            + iwc.getMaxBufferedDocs(),
        numDocs,
        w.getDocStats().maxDoc);
    w.close();

    IndexReader r = DirectoryReader.open(dir);
    assertEquals(numDocs, r.maxDoc());
    IOUtils.close(r, dir);
  }
}
