content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.plan.transform.compact;
  
  import alluxio.job.plan.transform.format.TableReader;
  import alluxio.job.plan.transform.format.TableWriter;
  import alluxio.job.plan.transform.format.tables.TablesWriter;
  
  import java.io.IOException;
  import java.util.List;
  
  /**
   * Compacts a list of inputs to an output.
   * The output can either be a single table file, or a group of table files where each file is
   * completed once it reaches a certain size.
   */
  public interface Compactor {
    /**
     * Compacts a list of inputs to the output.
     * Closing the readers and writer is the responsibility of the caller.
     *
     * @param inputs a list of table readers
     * @param output a table writer, can be a {@link TablesWriter}
     * @throws IOException when compaction fails
     */
    void compact(List<TableReader> inputs, TableWriter output) throws IOException;
  }
  