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.master.journal.checkpoint;
  
  import net.jpountz.lz4.LZ4FrameInputStream;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.security.DigestInputStream;
  import java.security.MessageDigest;
  
  /**
   * InputStream to read checkpoint files efficiently.
   */
  public class OptimizedCheckpointInputStream extends CheckpointInputStream {
  
    /**
     * @param file where the checkpoint will be read from
     * @param digest that verifies the file has not been corrupted
     * @throws IOException propagates wrapped input stream exceptions
     */
    public OptimizedCheckpointInputStream(File file, MessageDigest digest) throws IOException {
      super(new DigestInputStream(new LZ4FrameInputStream(
          new BufferedInputStream(Files.newInputStream(file.toPath()),
              OptimizedCheckpointOutputStream.BUFFER_SIZE)), digest));
    }
  }
  