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.storage;
  
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.spark.annotation.Private;
  import org.apache.spark.executor.ShuffleWriteMetrics;
  
  /**
   * Intercepts write calls and tracks total time spent writing in order to update shuffle write
   * metrics. Not thread safe.
   */
  @Private
  public final class TimeTrackingOutputStream extends OutputStream {
  
    private final ShuffleWriteMetrics writeMetrics;
    private final OutputStream outputStream;
  
    public TimeTrackingOutputStream(ShuffleWriteMetrics writeMetrics, OutputStream outputStream) {
      this.writeMetrics = writeMetrics;
      this.outputStream = outputStream;
    }
  
    @Override
    public void write(int b) throws IOException {
      final long startTime = System.nanoTime();
      outputStream.write(b);
      writeMetrics.incWriteTime(System.nanoTime() - startTime);
    }
  
    @Override
    public void write(byte[] b) throws IOException {
      final long startTime = System.nanoTime();
      outputStream.write(b);
      writeMetrics.incWriteTime(System.nanoTime() - startTime);
    }
  
    @Override
    public void write(byte[] b, int off, int len) throws IOException {
      final long startTime = System.nanoTime();
      outputStream.write(b, off, len);
      writeMetrics.incWriteTime(System.nanoTime() - startTime);
    }
  
    @Override
    public void flush() throws IOException {
      final long startTime = System.nanoTime();
      outputStream.flush();
      writeMetrics.incWriteTime(System.nanoTime() - startTime);
    }
  
    @Override
    public void close() throws IOException {
      final long startTime = System.nanoTime();
      outputStream.close();
      writeMetrics.incWriteTime(System.nanoTime() - startTime);
    }
  }
  