Package org.eclipse.jgit.internal.storage.dfs

Class DfsReftable.CacheSource

java.lang.Object

org.eclipse.jgit.internal.storage.io.BlockSource

org.eclipse.jgit.internal.storage.dfs.DfsReftable.CacheSource

All Implemented Interfaces:

java.lang.AutoCloseable

Enclosing class:

DfsReftable

private static final class DfsReftable.CacheSource
extends BlockSource

Field Summary

Fields

Modifier and Type	Field	Description
private DfsBlockCache	cache
private ReadableChannel	ch
private DfsReader	ctx
private DfsReftable	file
private int	readAhead

Constructor Summary

Constructors

Constructor	Description
CacheSource(DfsReftable file, DfsBlockCache cache, DfsReader ctx)

Method Summary

Modifier and Type	Method	Description
void	adviseSequentialRead(long start, long end)	Advise the BlockSource a sequential scan is starting.
void	close()
private boolean	notInCache(long pos)
private ReadableChannel	open()
java.nio.ByteBuffer	read(long pos, int cnt)	Read a block from the file.
long	size()	Determine the size of the file.

Methods inherited from class org.eclipse.jgit.internal.storage.io.BlockSource

from, from, from

Methods inherited from class java.lang.Object

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

Field Detail

file

private final DfsReftable file

cache

private final DfsBlockCache cache

ctx

private final DfsReader ctx

ch

private ReadableChannel ch

readAhead

private int readAhead

Constructor Detail

CacheSource

CacheSource(DfsReftable file,
            DfsBlockCache cache,
            DfsReader ctx)

Method Detail

read

public java.nio.ByteBuffer read(long pos,
                                int cnt)
                         throws java.io.IOException

Description copied from class: BlockSource

Read a block from the file.

To reduce copying, the returned ByteBuffer should have an accessible array and arrayOffset() == 0. The caller will discard the ByteBuffer and directly use the backing array.

Specified by:

read in class BlockSource

Parameters:

pos - position of the block in the file, specified in bytes from the beginning of the file.

cnt - size to read.

Returns:

buffer containing the block content.

Throws:

java.io.IOException - if block cannot be read.

notInCache

private boolean notInCache(long pos)

size

public long size()
          throws java.io.IOException

Description copied from class: BlockSource

Determine the size of the file.

Specified by:

size in class BlockSource

Returns:

total number of bytes in the file.

Throws:

java.io.IOException - if size cannot be obtained.

adviseSequentialRead

public void adviseSequentialRead(long start,
                                 long end)

Description copied from class: BlockSource

Advise the BlockSource a sequential scan is starting.

Overrides:

adviseSequentialRead in class BlockSource

Parameters:

start - starting position.

end - ending position.

open

private ReadableChannel open()
                      throws java.io.IOException

Throws:

java.io.IOException

close

public void close()

Description copied from class: BlockSource

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in class BlockSource