org.eclipse.jgit.storage.dfs
Class DfsOutputStream

java.lang.Object
  java.io.OutputStream
      org.eclipse.jgit.storage.dfs.DfsOutputStream

All Implemented Interfaces:

Closeable, Flushable

public abstract class DfsOutputStream
extends OutputStream

Output stream to create a file on the DFS.

See Also:

DfsObjDatabase.writePackFile(DfsPackDescription), DfsObjDatabase.writePackIndex(DfsPackDescription)

Constructor Summary

DfsOutputStream()

Method Summary

int	blockSize() Get the recommended alignment for writing.
abstract int	read(long position, ByteBuffer buf) Read back a portion of already written data.
abstract void	write(byte[] buf, int off, int len)
void	write(int b)

Methods inherited from class java.io.OutputStream

close, flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DfsOutputStream

public DfsOutputStream()

Method Detail

blockSize

public int blockSize()

Get the recommended alignment for writing.

Starting a write at multiples of the blockSize is more efficient than starting a write at any other position. If 0 or -1 the channel does not have any specific block size recommendation.

Channels should not recommend large block sizes. Sizes up to 1-4 MiB may be reasonable, but sizes above that may be horribly inefficient.

Returns:

recommended alignment size for randomly positioned reads. Does not need to be a power of 2.

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public abstract void write(byte[] buf,
                           int off,
                           int len)
                    throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

read

public abstract int read(long position,
                         ByteBuffer buf)
                  throws IOException

Read back a portion of already written data.

The writing position of the output stream is not affected by a read.

Parameters:

position - offset to read from.

buf - buffer to populate. Up to buf.remaining() bytes will be read from position.

Returns:

number of bytes actually read.

Throws:

IOException - reading is not supported, or the read cannot be performed due to DFS errors.