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.IOException;
  
  import org.iq80.leveldb.WriteOptions;
  
  /** Note: code copied from Apache Spark. */
  public class LevelDB implements DB {
    private final org.iq80.leveldb.DB db;
    private final WriteOptions SYNC_WRITE_OPTIONS = new WriteOptions().sync(true);
  
    public LevelDB(org.iq80.leveldb.DB db) {
      this.db = db;
    }
  
    @Override
    public void put(byte[] key, byte[] value) {
      db.put(key, value);
    }
  
    @Override
    public void put(byte[] key, byte[] value, boolean sync) {
      if (sync) {
        db.put(key, value, SYNC_WRITE_OPTIONS);
      } else {
        db.put(key, value);
      }
    }
  
    @Override
    public byte[] get(byte[] key) {
      return db.get(key);
    }
  
    @Override
    public void delete(byte[] key) {
      db.delete(key);
    }
  
    @Override
    public void close() throws IOException {
      db.close();
    }
  
    @Override
    public DBIterator iterator() {
      return new LevelDBIterator(db.iterator());
    }
  }
  