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.celeborn.client;
  
  import java.io.IOException;
  
  import org.slf4j.LoggerFactory;
  
  import org.apache.celeborn.client.read.CelebornInputStream;
  import org.apache.celeborn.client.read.MetricsCallback;
  import org.apache.celeborn.common.exception.CelebornIOException;
  import org.apache.celeborn.common.unsafe.Platform;
  
  public class CelebornTezReader {
    private static final org.slf4j.Logger logger = LoggerFactory.getLogger(CelebornTezReader.class);
  
    private int shuffleId;
    private int partitionId;
    private int attemptNumber;
    private ShuffleClient shuffleClient;
    private long inputShuffleSize;
    private CelebornInputStream celebornInputStream;
  
    public CelebornTezReader(
        ShuffleClient shuffleClient, int shuffleId, int partitionId, int attemptNumber) {
      this.shuffleClient = shuffleClient;
      this.partitionId = partitionId;
      this.attemptNumber = attemptNumber;
      this.shuffleId = shuffleId;
    }
  
    public void init() throws IOException {
      MetricsCallback metricsCallback =
          new MetricsCallback() {
            @Override
            public void incBytesRead(long bytesRead) {}
  
            @Override
            public void incReadTime(long time) {}
          };
      celebornInputStream =
          shuffleClient.readPartition(
              shuffleId, partitionId, attemptNumber, 0, 0, Integer.MAX_VALUE, metricsCallback);
    }
  
    public byte[] getShuffleBlock() throws IOException {
      // get len
      byte[] header = new byte[4];
      int count = celebornInputStream.read(header);
      if (count == -1) {
        return null;
      }
      while (count != header.length) {
        count += celebornInputStream.read(header, count, 4 - count);
      }
  
      // get data
      int blockLen = Platform.getInt(header, Platform.BYTE_ARRAY_OFFSET);
      inputShuffleSize += blockLen;
      byte[] shuffleData = new byte[blockLen];
      count = celebornInputStream.read(shuffleData);
      while (count != shuffleData.length) {
        count += celebornInputStream.read(shuffleData, count, blockLen - count);
        if (count == -1) {
          // read shuffle is done.
          throw new CelebornIOException("Read mr shuffle failed.");
        }
      }
      return shuffleData;
    }
  
    public void close() throws IOException {
      celebornInputStream.close();
    }
  
    public int getPartitionId() {
      return partitionId;
    }
  }
  