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

Class BlockBasedFile

java.lang.Object

org.eclipse.jgit.internal.storage.dfs.BlockBasedFile

Direct Known Subclasses:

DfsPackFile, DfsReftable

abstract class BlockBasedFile
extends java.lang.Object

Block based file stored in DfsBlockCache.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	BlockBasedFile.LazyChannel	A supplier of readable channel that opens the channel lazily.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) int	blockSize	Preferred alignment for loading blocks from the backing file.
(package private) DfsBlockCache	cache	Cache that owns this file and its data.
(package private) DfsPackDescription	desc	Description of the associated pack file's storage.
(package private) PackExt	ext
(package private) boolean	invalid	True once corruption has been detected that cannot be worked around.
protected java.lang.Exception	invalidatingCause	Exception that caused the packfile to be flagged as invalid
(package private) DfsStreamKey	key	Unique identity of this file while in-memory.
(package private) long	length	Total number of bytes in this pack file.

Constructor Summary

Constructors

Constructor	Description
BlockBasedFile(DfsBlockCache cache, DfsPackDescription desc, PackExt ext)

Method Summary

Modifier and Type	Method	Description
(package private) long	alignToBlock(long pos)
(package private) int	blockSize(ReadableChannel rc)
(package private) static long	elapsedMicros(long start)
(package private) java.lang.String	getFileName()
(package private) DfsBlock	getOrLoadBlock(long pos, DfsReader ctx)
(package private) boolean	invalid()
(package private) static int	read(ReadableChannel rc, java.nio.ByteBuffer buf)
(package private) DfsBlock	readOneBlock(long pos, DfsReader ctx, ReadableChannel rc)
(package private) void	setBlockSize(int newSize)
(package private) void	setInvalid()

Methods inherited from class java.lang.Object

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

Field Detail

cache

final DfsBlockCache cache

Cache that owns this file and its data.

key

final DfsStreamKey key

Unique identity of this file while in-memory.

desc

final DfsPackDescription desc

Description of the associated pack file's storage.

ext

final PackExt ext

blockSize

volatile int blockSize

Preferred alignment for loading blocks from the backing file.

It is initialized to 0 and filled in on the first read made from the file. Block sizes may be odd, e.g. 4091, caused by the underling DFS storing 4091 user bytes and 5 bytes block metadata into a lower level 4096 byte block on disk.

length

volatile long length

Total number of bytes in this pack file.

This field initializes to -1 and gets populated when a block is loaded.

invalid

volatile boolean invalid

True once corruption has been detected that cannot be worked around.

invalidatingCause

protected volatile java.lang.Exception invalidatingCause

Exception that caused the packfile to be flagged as invalid

Constructor Detail

BlockBasedFile

BlockBasedFile(DfsBlockCache cache,
               DfsPackDescription desc,
               PackExt ext)

Method Detail

getFileName

java.lang.String getFileName()

invalid

boolean invalid()

setInvalid

void setInvalid()

setBlockSize

void setBlockSize(int newSize)

alignToBlock

long alignToBlock(long pos)

blockSize

int blockSize(ReadableChannel rc)

getOrLoadBlock

DfsBlock getOrLoadBlock(long pos,
                        DfsReader ctx)
                 throws java.io.IOException

Throws:

java.io.IOException

readOneBlock

DfsBlock readOneBlock(long pos,
                      DfsReader ctx,
                      ReadableChannel rc)
               throws java.io.IOException

Throws:

java.io.IOException

read

static int read(ReadableChannel rc,
                java.nio.ByteBuffer buf)
         throws java.io.IOException

Throws:

java.io.IOException

elapsedMicros

static long elapsedMicros(long start)