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.spark.network.shuffle;
  
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  import com.google.common.io.Closeables;
  import com.google.common.io.Files;
  
  import org.apache.spark.network.shuffle.protocol.ExecutorShuffleInfo;
  import org.apache.spark.network.util.JavaUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Manages some sort-shuffle data, including the creation
   * and cleanup of directories that can be read by the {@link ExternalShuffleBlockResolver}.
   */
  public class TestShuffleDataContext {
    private static final Logger logger = LoggerFactory.getLogger(TestShuffleDataContext.class);
  
    public final String[] localDirs;
    public final int subDirsPerLocalDir;
  
    public TestShuffleDataContext(int numLocalDirs, int subDirsPerLocalDir) {
      this.localDirs = new String[numLocalDirs];
      this.subDirsPerLocalDir = subDirsPerLocalDir;
    }
  
    public void create() {
      for (int i = 0; i < localDirs.length; i ++) {
        localDirs[i] = Files.createTempDir().getAbsolutePath();
  
        for (int p = 0; p < subDirsPerLocalDir; p ++) {
          new File(localDirs[i], String.format("%02x", p)).mkdirs();
        }
      }
    }
  
    public void cleanup() {
      for (String localDir : localDirs) {
        try {
          JavaUtils.deleteRecursively(new File(localDir));
        } catch (IOException e) {
          logger.warn("Unable to cleanup localDir = " + localDir, e);
        }
      }
    }
  
    /** Creates reducer blocks in a sort-based data format within our local dirs. */
    public void insertSortShuffleData(int shuffleId, int mapId, byte[][] blocks) throws IOException {
      String blockId = "shuffle_" + shuffleId + "_" + mapId + "_0";
  
      OutputStream dataStream = null;
      DataOutputStream indexStream = null;
      boolean suppressExceptionsDuringClose = true;
  
      try {
        dataStream = new FileOutputStream(
          ExternalShuffleBlockResolver.getFile(localDirs, subDirsPerLocalDir, blockId + ".data"));
        indexStream = new DataOutputStream(new FileOutputStream(
          ExternalShuffleBlockResolver.getFile(localDirs, subDirsPerLocalDir, blockId + ".index")));
  
        long offset = 0;
        indexStream.writeLong(offset);
        for (byte[] block : blocks) {
          offset += block.length;
          dataStream.write(block);
          indexStream.writeLong(offset);
        }
        suppressExceptionsDuringClose = false;
      } finally {
        Closeables.close(dataStream, suppressExceptionsDuringClose);
        Closeables.close(indexStream, suppressExceptionsDuringClose);
      }
    }
  
    /**
     * Creates an ExecutorShuffleInfo object based on the given shuffle manager which targets this
     * context's directories.
     */
    public ExecutorShuffleInfo createExecutorInfo(String shuffleManager) {
      return new ExecutorShuffleInfo(localDirs, subDirsPerLocalDir, shuffleManager);
    }
  }
  