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.client.block.stream;
  
  import alluxio.grpc.ReadRequest;
  import alluxio.grpc.ReadResponse;
  import alluxio.network.protocol.databuffer.DataBuffer;
  import alluxio.network.protocol.databuffer.NioDataBuffer;
  import alluxio.resource.CloseableResource;
  import alluxio.util.io.BufferUtils;
  import alluxio.wire.WorkerNetAddress;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /**
   * A {@link BufferCachingGrpcDataReader} which serves data from
   * a manually created increasing byte buffer. It helps recording
   * the number of read operations and validates the read results are correct.
   */
  public class TestBufferCachingGrpcDataReader extends BufferCachingGrpcDataReader {
    private int mReadChunkNum = 0;
    private int mChunkSize;
    private int mBlockSize;
    private int mTotalChunkNum = -1;
  
    TestBufferCachingGrpcDataReader(WorkerNetAddress address,
        CloseableResource<BlockWorkerClient> client, long dataTimeoutMs,
        ReadRequest readRequest, GrpcBlockingStream<ReadRequest, ReadResponse> stream,
        int chunkSize, int blockSize) {
      super(address, client, dataTimeoutMs, readRequest, stream);
      mChunkSize = chunkSize;
      mBlockSize = blockSize;
    }
  
    @Override
    protected DataBuffer readChunk() {
      if (mTotalChunkNum == -1) {
        mTotalChunkNum = getTotalChunkNum();
      }
      if (mReadChunkNum >= mTotalChunkNum) { // finished reading
        return null;
      }
      ByteBuffer byteBuffer = null;
      if ((mReadChunkNum + 1) * mChunkSize <= mBlockSize) { // full block read
        byteBuffer = BufferUtils
            .getIncreasingByteBuffer(mReadChunkNum * mChunkSize, mChunkSize);
      } else { // partial block read for the last chunk
        byteBuffer = BufferUtils.getIncreasingByteBuffer(
            mReadChunkNum * mChunkSize, mBlockSize - mReadChunkNum * mChunkSize);
      }
      DataBuffer buffer = new NioDataBuffer(byteBuffer, byteBuffer.remaining());
      mPosToRead += buffer.readableBytes();
      mReadChunkNum++;
      return buffer;
    }
  
    @Override
    public void close() throws IOException {
      // no-op
    }
  
    public int getReadChunkNum() {
      return mReadChunkNum;
    }
  
    public boolean validateBuffer(int index, DataBuffer buffer) {
      if (mTotalChunkNum == -1) {
        mTotalChunkNum = getTotalChunkNum();
      }
      if (buffer == null) {
        return index >= mTotalChunkNum;
      }
      int bufferSize = buffer.readableBytes();
      if (index < mTotalChunkNum - 1 && bufferSize != mChunkSize) {
        return false;
      }
      if (index == mTotalChunkNum - 1
          && bufferSize != mBlockSize - (mTotalChunkNum - 1) * mChunkSize) {
        return false;
      }
      byte[] byteArray = new byte[bufferSize];
      buffer.readBytes(byteArray, 0, bufferSize);
      return BufferUtils.equalIncreasingByteArray(index * mChunkSize, bufferSize, byteArray);
    }
  
    public boolean validateBuffer(int start, int length, DataBuffer buffer) {
      if (buffer == null) {
        return start >= mBlockSize;
      }
      if (start + length >= mBlockSize) {
        return false;
      }
      if (buffer.readableBytes() != length) {
        return false;
      }
      byte[] byteArray = new byte[length];
      buffer.readBytes(byteArray, 0, length);
      return BufferUtils.equalIncreasingByteArray(start, length, byteArray);
    }
  
    public int getTotalChunkNum() {
      if (mBlockSize % mChunkSize == 0) {
        return mBlockSize / mChunkSize;
      }
      return mBlockSize / mChunkSize + 1;
    }
  }
  