/*
 * 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.Collection;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.FilterDirectory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestPersistentSnapshotSyncFailure extends LuceneTestCase {

  private static class FailOnceSyncDirectory extends FilterDirectory {
    boolean failNextSync;

    FailOnceSyncDirectory() {
      super(new ByteBuffersDirectory());
    }

    @Override
    public void sync(Collection<String> names) throws IOException {
      if (failNextSync) {
        failNextSync = false;
        throw new IOException("injected fsync failure");
      }
      super.sync(names);
    }
  }

  public void testSnapshotAfterFailedSaveFileSync() throws IOException {
    try (FailOnceSyncDirectory dir = new FailOnceSyncDirectory()) {
      PersistentSnapshotDeletionPolicy policy =
          new PersistentSnapshotDeletionPolicy(new KeepOnlyLastCommitDeletionPolicy(), dir);
      try (IndexWriter w =
          new IndexWriter(dir, new IndexWriterConfig().setIndexDeletionPolicy(policy))) {
        w.commit();
        dir.failNextSync = true;
        expectThrows(IOException.class, policy::snapshot);
        try {
          policy.snapshot();
        } catch (IOException e) {
          fail("expected the next, fault-free snapshot() to succeed, but it threw " + e);
        }
      }
    }
  }
}