/*
 * 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.List;
import org.apache.lucene.document.Document;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestIndexWriterFromReaderFailedOpen extends LuceneTestCase {

  public void testFailedOpenFromReaderCommitReleasesSegmentReaders() throws Exception {
    Directory dir = newMockDirectory();
    IndexWriter w = new IndexWriter(dir, new IndexWriterConfig());
    w.addDocument(new Document());
    w.close();

    DirectoryReader r = DirectoryReader.open(dir);
    IndexWriterConfig iwc =
        new IndexWriterConfig()
            .setIndexCommit(r.getIndexCommit())
            .setIndexDeletionPolicy(
                new IndexDeletionPolicy() {
                  @Override
                  public void onInit(List<? extends IndexCommit> commits) throws IOException {
                    throw new IOException("onInit failed");
                  }

                  @Override
                  public void onCommit(List<? extends IndexCommit> commits) {}
                });
    expectThrows(IOException.class, () -> new IndexWriter(dir, iwc));

    r.close();
    // expected: dir.close() succeeds; actual: "there are still 1 open files: {_0.cfs=1}"
    dir.close();
  }
}