datasketches-memory-java8/src/main/java/org/apache/datasketches/memory/internal/MapNonNativeWritableMemoryImpl.java [46:125]:
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    this.cumOffsetBytes = cumOffsetBytes;
    if ((this.owner != null) && (this.owner != Thread.currentThread())) {
      throw new IllegalStateException(THREAD_EXCEPTION_TEXT);
    }
    this.owner = Thread.currentThread();
  }

  @Override
  BaseWritableMemoryImpl toWritableRegion(
      final long regionOffsetBytes,
      final long capacityBytes,
      final boolean readOnly,
      final ByteOrder byteOrder) {
    final long newOffsetBytes = offsetBytes + regionOffsetBytes;
    final long newCumOffsetBytes = cumOffsetBytes + regionOffsetBytes;
    int typeIdOut = removeNnBuf(typeId) | MAP | REGION | (readOnly ? READONLY : 0);

    if (Util.isNativeByteOrder(byteOrder)) {
      typeIdOut |= NATIVE;
      return new MapWritableMemoryImpl(
          dirWMap, newOffsetBytes, capacityBytes, typeIdOut, newCumOffsetBytes);
    } else {
      typeIdOut |= NONNATIVE;
      return new MapNonNativeWritableMemoryImpl(
          dirWMap, newOffsetBytes, capacityBytes, typeIdOut, newCumOffsetBytes);
    }
  }

  @Override
  BaseWritableBufferImpl toWritableBuffer(final boolean readOnly, final ByteOrder byteOrder) {
    int typeIdOut = removeNnBuf(typeId) | BUFFER | (readOnly ? READONLY : 0);

    if (byteOrder == ByteOrder.nativeOrder()) {
      typeIdOut |= NATIVE;
      return new MapWritableBufferImpl(
          dirWMap, offsetBytes, capacityBytes, typeIdOut, cumOffsetBytes);
    } else {
      typeIdOut |= NONNATIVE;
      return new MapNonNativeWritableBufferImpl(
          dirWMap, offsetBytes, capacityBytes, typeIdOut, cumOffsetBytes);
    }
  }

  @Override
  public void close() {
    checkValid();
    checkThread(owner);
    dirWMap.close(); //checksValidAndThread
  }

  @Override
  public void force() {
    checkValid();
    checkThread(owner);
    checkNotReadOnly();
    dirWMap.force(); //checksValidAndThread
  }

  @Override
  Object getUnsafeObject() {
    return null;
  }

  @Override
  public boolean isLoaded() {
    checkValid();
    checkThread(owner);
    return dirWMap.isLoaded(); //checksValidAndThread
  }

  @Override
  public boolean isValid() {
    return dirWMap.getValid().get();
  }

  @Override
  public void load() {
    checkValid();
    checkThread(owner);
    dirWMap.load(); //checksValidAndThread
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datasketches-memory-java8/src/main/java/org/apache/datasketches/memory/internal/MapWritableMemoryImpl.java [46:125]:
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    this.cumOffsetBytes = cumOffsetBytes;
    if ((this.owner != null) && (this.owner != Thread.currentThread())) {
      throw new IllegalStateException(THREAD_EXCEPTION_TEXT);
    }
    this.owner = Thread.currentThread();
  }

  @Override
  BaseWritableMemoryImpl toWritableRegion(
      final long regionOffsetBytes,
      final long capacityBytes,
      final boolean readOnly,
      final ByteOrder byteOrder) {
    final long newOffsetBytes = offsetBytes + regionOffsetBytes;
    final long newCumOffsetBytes = cumOffsetBytes + regionOffsetBytes;
    int typeIdOut = removeNnBuf(typeId) | MAP | REGION | (readOnly ? READONLY : 0);

    if (Util.isNativeByteOrder(byteOrder)) {
      typeIdOut |= NATIVE;
      return new MapWritableMemoryImpl(
          dirWMap, newOffsetBytes, capacityBytes, typeIdOut, newCumOffsetBytes);
    } else {
      typeIdOut |= NONNATIVE;
      return new MapNonNativeWritableMemoryImpl(
          dirWMap, newOffsetBytes, capacityBytes, typeIdOut, newCumOffsetBytes);
    }
  }

  @Override
  BaseWritableBufferImpl toWritableBuffer(final boolean readOnly, final ByteOrder byteOrder) {
    int typeIdOut = removeNnBuf(typeId) | BUFFER | (readOnly ? READONLY : 0);

    if (byteOrder == ByteOrder.nativeOrder()) {
      typeIdOut |= NATIVE;
      return new MapWritableBufferImpl(
          dirWMap, offsetBytes, capacityBytes, typeIdOut, cumOffsetBytes);
    } else {
      typeIdOut |= NONNATIVE;
      return new MapNonNativeWritableBufferImpl(
          dirWMap, offsetBytes, capacityBytes, typeIdOut, cumOffsetBytes);
    }
  }

  @Override
  public void close() {
    checkValid();
    checkThread(owner);
    dirWMap.close();
  }

  @Override
  public void force() {
    checkValid();
    checkThread(owner);
    checkNotReadOnly();
    dirWMap.force(); //checksValidAndThread
  }

  @Override
  Object getUnsafeObject() {
    return null;
  }

  @Override
  public boolean isLoaded() {
    checkValid();
    checkThread(owner);
    return dirWMap.isLoaded(); //checksValidAndThread
  }

  @Override
  public boolean isValid() {
    return dirWMap.getValid().get();
  }

  @Override
  public void load() {
    checkValid();
    checkThread(owner);
    dirWMap.load(); //checksValidAndThread
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