org.eclipse.jgit.internal.storage.dfs

Class InMemoryRepository.MemObjDatabase

java.lang.Object

org.eclipse.jgit.lib.ObjectDatabase

org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase

org.eclipse.jgit.internal.storage.dfs.InMemoryRepository.MemObjDatabase

Enclosing class:

InMemoryRepository

public static class InMemoryRepository.MemObjDatabase
extends DfsObjDatabase

DfsObjDatabase used by InMemoryRepository.

Nested Class Summary

Nested classes/interfaces inherited from class org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase

DfsObjDatabase.PackList, DfsObjDatabase.PackSource

Method Summary

Modifier and Type	Method and Description
protected void	commitPackImpl(Collection<DfsPackDescription> desc, Collection<DfsPackDescription> replace) Implementation of pack commit.
protected List<DfsPackDescription>	listPacks() List the available pack files.
protected DfsPackDescription	newPack(DfsObjDatabase.PackSource source) Generate a new unique name for a pack file.
protected ReadableChannel	openFile(DfsPackDescription desc, PackExt ext) Open a pack, pack index, or other related file for reading.
protected void	rollbackPack(Collection<DfsPackDescription> desc) Try to rollback a pack creation.
void	setReadableChannelBlockSizeForTest(int blockSize)
protected DfsOutputStream	writeFile(DfsPackDescription desc, PackExt ext) Open a pack, pack index, or other related file for writing.

Methods inherited from class org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase

clearCache, close, commitPack, getCurrentPackList, getCurrentPacks, getCurrentReftables, getPackList, getPacks, getReaderOptions, getReftables, getRepository, has, newInserter, newPack, newReader, reftableComparator, setPackComparator

Methods inherited from class org.eclipse.jgit.lib.ObjectDatabase

create, exists, has, newCachedDatabase, open, open

Methods inherited from class java.lang.Object

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

Method Detail

setReadableChannelBlockSizeForTest

public void setReadableChannelBlockSizeForTest(int blockSize)

Parameters:

blockSize - force a different block size for testing.

listPacks

protected List<DfsPackDescription> listPacks()

Description copied from class: DfsObjDatabase

List the available pack files.

The returned list must support random access and must be mutable by the caller. It is sorted in place using the natural sorting of the returned DfsPackDescription objects.

Specified by:

listPacks in class DfsObjDatabase

Returns:

available packs. May be empty if there are no packs.

newPack

protected DfsPackDescription newPack(DfsObjDatabase.PackSource source)

Description copied from class: DfsObjDatabase

Generate a new unique name for a pack file.

Specified by:

newPack in class DfsObjDatabase

Parameters:

source - where the pack stream is created.

Returns:

a unique name for the pack file. Must not collide with any other pack file name in the same DFS.

commitPackImpl

protected void commitPackImpl(Collection<DfsPackDescription> desc,
                              Collection<DfsPackDescription> replace)

Description copied from class: DfsObjDatabase

Implementation of pack commit.

Specified by:

commitPackImpl in class DfsObjDatabase

Parameters:

desc - description of the new packs.

replace - if not null, list of packs to remove.

See Also:

DfsObjDatabase.commitPack(Collection, Collection)

rollbackPack

protected void rollbackPack(Collection<DfsPackDescription> desc)

Description copied from class: DfsObjDatabase

Try to rollback a pack creation.

JGit DFS always writes the pack first, then the index. If the pack does not yet exist, then neither does the index. A safe DFS implementation would try to remove both files to ensure they are really gone.

A rollback does not support failures, as it only occurs when there is already a failure in progress. A DFS implementor may wish to log warnings/error messages when a rollback fails, but should not send new exceptions up the Java callstack.

Specified by:

rollbackPack in class DfsObjDatabase

Parameters:

desc - pack to delete.

openFile

protected ReadableChannel openFile(DfsPackDescription desc,
                                   PackExt ext)
                            throws FileNotFoundException,
                                   IOException

Description copied from class: DfsObjDatabase

Open a pack, pack index, or other related file for reading.

Specified by:

openFile in class DfsObjDatabase

Parameters:

desc - description of pack related to the data that will be read. This is an instance previously obtained from DfsObjDatabase.listPacks(), but not necessarily from the same DfsObjDatabase instance.

ext - file extension that will be read i.e "pack" or "idx".

Returns:

channel to read the file.

Throws:

FileNotFoundException - the file does not exist.

IOException - the file cannot be opened.

writeFile

protected DfsOutputStream writeFile(DfsPackDescription desc,
                                    PackExt ext)
                             throws IOException

Description copied from class: DfsObjDatabase

Open a pack, pack index, or other related file for writing.

Specified by:

writeFile in class DfsObjDatabase

Parameters:

desc - description of pack related to the data that will be written. This is an instance previously obtained from DfsObjDatabase.newPack(PackSource).

ext - file extension that will be written i.e "pack" or "idx".

Returns:

channel to write the file.

Throws:

IOException - the file cannot be opened.