private static long map()

in datasketches-memory-java8/src/main/java/org/apache/datasketches/memory/internal/AllocateDirectWritableMap.java [238:254]

• 16 lines of code
• 4 McCabe index (conditional complexity)

  private static long map(final FileChannel fileChannel, final boolean resourceReadOnly,
      final long position, final long lengthBytes) {
    final int pagePosition = (int) (position % unsafe.pageSize());
    final long mapPosition = position - pagePosition;
    final long mapSize = lengthBytes + pagePosition;
    final int mapMode = resourceReadOnly ? MAP_RO : MAP_RW;
    //final boolean isSync = true; //required as of JDK14, but it is more complex
    try {
      final long nativeBaseOffset = //JDK14 add isSync
        (long) FILE_CHANNEL_IMPL_MAP0_METHOD.invoke(fileChannel, mapMode, mapPosition, mapSize);
      return nativeBaseOffset;
    } catch (final InvocationTargetException e) {
      throw new RuntimeException("Exception while mapping", e.getTargetException());
    } catch (final IllegalAccessException e) {
      throw new RuntimeException("Exception while mapping", e);
    }
  }