content: /*
   * 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.celeborn.service.deploy.worker.shuffledb;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /** Note: code copied from Apache Spark. */
  public class DBProvider {
    private static final Logger logger = LoggerFactory.getLogger(DBProvider.class);
  
    public static DB initDB(DBBackend dbBackend, File dbFile, StoreVersion version)
        throws IOException {
      if (dbFile != null) {
        switch (dbBackend) {
          case LEVELDB:
            org.iq80.leveldb.DB levelDB = LevelDBProvider.initLevelDB(dbFile, version);
            logger.warn("The LEVELDB is deprecated. Please use ROCKSDB instead.");
            return levelDB != null ? new LevelDB(levelDB) : null;
          case ROCKSDB:
            org.rocksdb.RocksDB rocksDB = RocksDBProvider.initRockDB(dbFile, version);
            return rocksDB != null ? new RocksDB(rocksDB) : null;
          default:
            throw new IllegalArgumentException("Unsupported DBBackend: " + dbBackend);
        }
      }
      return null;
    }
  }
  