hadoop ByteBufferEncodingState 源码

  • 2022-10-20
  • 浏览 (609)

haddop ByteBufferEncodingState 代码

文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/rawcoder/ByteBufferEncodingState.java

/**
 * 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.hadoop.io.erasurecode.rawcoder;

import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;

import java.nio.ByteBuffer;

/**
 * A utility class that maintains encoding state during an encode call using
 * ByteBuffer inputs.
 */
@InterfaceAudience.Private
class ByteBufferEncodingState extends EncodingState {
  ByteBuffer[] inputs;
  ByteBuffer[] outputs;
  boolean usingDirectBuffer;

  ByteBufferEncodingState(RawErasureEncoder encoder,
                          ByteBuffer[] inputs, ByteBuffer[] outputs) {
    this.encoder = encoder;
    ByteBuffer validInput = CoderUtil.findFirstValidInput(inputs);
    this.encodeLength = validInput.remaining();
    this.usingDirectBuffer = validInput.isDirect();
    this.inputs = inputs;
    this.outputs = outputs;

    checkParameters(inputs, outputs);
    checkBuffers(inputs);
    checkBuffers(outputs);
  }

  ByteBufferEncodingState(RawErasureEncoder encoder,
                          int encodeLength,
                          ByteBuffer[] inputs,
                          ByteBuffer[] outputs) {
    this.encoder = encoder;
    this.encodeLength = encodeLength;
    this.inputs = inputs;
    this.outputs = outputs;
  }

  /**
   * Convert to a ByteArrayEncodingState when it's backed by on-heap arrays.
   */
  ByteArrayEncodingState convertToByteArrayState() {
    int[] inputOffsets = new int[inputs.length];
    int[] outputOffsets = new int[outputs.length];
    byte[][] newInputs = new byte[inputs.length][];
    byte[][] newOutputs = new byte[outputs.length][];

    ByteBuffer buffer;
    for (int i = 0; i < inputs.length; ++i) {
      buffer = inputs[i];
      inputOffsets[i] = buffer.arrayOffset() + buffer.position();
      newInputs[i] = buffer.array();
    }

    for (int i = 0; i < outputs.length; ++i) {
      buffer = outputs[i];
      outputOffsets[i] = buffer.arrayOffset() + buffer.position();
      newOutputs[i] = buffer.array();
    }

    ByteArrayEncodingState baeState = new ByteArrayEncodingState(encoder,
        encodeLength, newInputs, inputOffsets, newOutputs, outputOffsets);
    return baeState;
  }

  /**
   * Check and ensure the buffers are of the desired length and type, direct
   * buffers or not.
   * @param buffers the buffers to check
   */
  void checkBuffers(ByteBuffer[] buffers) {
    for (ByteBuffer buffer : buffers) {
      if (buffer == null) {
        throw new HadoopIllegalArgumentException(
            "Invalid buffer found, not allowing null");
      }

      if (buffer.remaining() != encodeLength) {
        throw new HadoopIllegalArgumentException(
            "Invalid buffer, not of length " + encodeLength);
      }
      if (buffer.isDirect() != usingDirectBuffer) {
        throw new HadoopIllegalArgumentException(
            "Invalid buffer, isDirect should be " + usingDirectBuffer);
      }
    }
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AbstractNativeRawDecoder 源码

hadoop AbstractNativeRawEncoder 源码

hadoop ByteArrayDecodingState 源码

hadoop ByteArrayEncodingState 源码

hadoop ByteBufferDecodingState 源码

hadoop CoderUtil 源码

hadoop DecodingState 源码

hadoop DecodingValidator 源码

hadoop DummyRawDecoder 源码

hadoop DummyRawEncoder 源码

0  赞