How to use

BlockBasedFile

in

org.eclipse.jgit.internal.storage.dfs

DfsBlock readOneBlock(long pos, DfsReader ctx,
    @Nullable ReadableChannel fileChannel) throws IOException {
  if (invalid)
    throw new PackInvalidException(getFileName());
      : ctx.db.openFile(desc, ext);
  try {
    int size = blockSize(rc);
    pos = (pos / size) * size;
      throw new EOFException(MessageFormat.format(
          DfsText.get().shortReadOfBlock, Long.valueOf(pos),
          getFileName(), Long.valueOf(0), Long.valueOf(0)));
    int cnt = read(rc, ByteBuffer.wrap(buf, 0, size));
    ctx.stats.readBlockBytes += cnt;
    if (cnt != size) {
        throw new EOFException(MessageFormat.format(
            DfsText.get().shortReadOfBlock, Long.valueOf(pos),
            getFileName(), Integer.valueOf(size),
            Integer.valueOf(cnt)));
      rc.close();
    ctx.stats.readBlockMicros += elapsedMicros(start);

void pin(BlockBasedFile file, long position) throws IOException {
  if (block == null || !block.contains(file.key, position)) {
    // If memory is low, we may need what is in our window field to
    // be cleaned up by the GC during the get for the next window.
    // So we always clear it, even though we are just going to set
    // it again.
    block = null;
    block = file.getOrLoadBlock(position, this);
  }
}

  @Nullable ReadableChannel fileChannel) throws IOException {
final long requestedPosition = position;
position = file.alignToBlock(position);
  boolean credit = true;
  try {
    v = file.readOneBlock(requestedPosition, ctx, fileChannel);
    credit = false;
  } finally {

  @Nullable ReadableChannel fileChannel) throws IOException {
final long requestedPosition = position;
position = file.alignToBlock(position);
  boolean credit = true;
  try {
    v = file.readOneBlock(requestedPosition, ctx, fileChannel);
    credit = false;
  } finally {

DfsBlock readOneBlock(long pos, DfsReader ctx,
    @Nullable ReadableChannel fileChannel) throws IOException {
  if (invalid)
    throw new PackInvalidException(getFileName());
      : ctx.db.openFile(desc, ext);
  try {
    int size = blockSize(rc);
    pos = (pos / size) * size;
      throw new EOFException(MessageFormat.format(
          DfsText.get().shortReadOfBlock, Long.valueOf(pos),
          getFileName(), Long.valueOf(0), Long.valueOf(0)));
    int cnt = read(rc, ByteBuffer.wrap(buf, 0, size));
    ctx.stats.readBlockBytes += cnt;
    if (cnt != size) {
        throw new EOFException(MessageFormat.format(
            DfsText.get().shortReadOfBlock, Long.valueOf(pos),
            getFileName(), Integer.valueOf(size),
            Integer.valueOf(cnt)));
      rc.close();
    ctx.stats.readBlockMicros += elapsedMicros(start);

void pin(BlockBasedFile file, long position) throws IOException {
  if (block == null || !block.contains(file.key, position)) {
    // If memory is low, we may need what is in our window field to
    // be cleaned up by the GC during the get for the next window.
    // So we always clear it, even though we are just going to set
    // it again.
    block = null;
    block = file.getOrLoadBlock(position, this);
  }
}