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.beam.runners.dataflow.util;
  
  import com.google.api.services.dataflow.model.DataflowPackage;
  import java.util.List;
  
  /** Interface for staging files needed for running a Dataflow pipeline. */
  public interface Stager {
    /**
     * Stage files and return a list of packages {@link DataflowPackage} objects describing th actual
     * location at which each file was staged.
     *
     * <p>The mechanism for staging is owned by the implementation. The only requirement is that the
     * location specified in the returned {@link DataflowPackage} should, in fact, contain the
     * contents of the staged file.
     */
    List<DataflowPackage> stageFiles(List<PackageUtil.StagedFile> filesToStage);
  
    /** Stage bytes to a target file name wherever this stager stages things. */
    DataflowPackage stageToFile(byte[] bytes, String baseName);
  }
  