Package org.apache.jackrabbit.oak.segment.spi.persistence

Interface SegmentArchiveManager

All Known Implementing Classes:

SegmentTarManager, SplitSegmentArchiveManager

public interface SegmentArchiveManager

SegmentArchiveManager provides a low-level access to the segment files (eg. stored in the .tar). It allows to perform a few FS-like operations (delete, rename, copy, etc.) and also opens the segment archives either for reading or reading and writing.

The implementation doesn't need to be thread-safe.

Method Summary

Modifier and Type	Method	Description
void	copyFile(@NotNull String from, @NotNull String to)	Copies the archive with all the segments.
@NotNull SegmentArchiveWriter	create(@NotNull String archiveName)	Creates a new archive.
boolean	delete(@NotNull String archiveName)	Deletes the archive if exists.
boolean	exists(@NotNull String archiveName)	Check if archive exists.
@Nullable SegmentArchiveReader	forceOpen(String archiveName)	Opens an archive that wasn't closed correctly.
@NotNull List<String>	listArchives()	List names of the available .tar archives.
@Nullable SegmentArchiveReader	open(@NotNull String archiveName)	Opens a given archive for reading.
void	recoverEntries(@NotNull String archiveName, @NotNull LinkedHashMap<UUID,byte[]> entries)	Finds all the segments included in the archive.
boolean	renameTo(@NotNull String from, @NotNull String to)	Renames the archive.

Method Detail

listArchives

@NotNull
@NotNull List<String> listArchives()
                            throws IOException

List names of the available .tar archives.

Returns:

archive list

Throws:

IOException

open

@Nullable
@Nullable SegmentArchiveReader open(@NotNull
                                    @NotNull String archiveName)
                             throws IOException

Opens a given archive for reading.

Parameters:

archiveName -

Returns:

the archive reader or null if the archive doesn't exist or doesn't have a valid index

Throws:

IOException

forceOpen

@Nullable
@Nullable SegmentArchiveReader forceOpen(String archiveName)
                                  throws IOException

Opens an archive that wasn't closed correctly.

Parameters:

archiveName -

Returns:

the archive reader or null if the implementation doesn't support opening an unclosed archive

Throws:

IOException

create

@NotNull
@NotNull SegmentArchiveWriter create(@NotNull
                                     @NotNull String archiveName)
                              throws IOException

Creates a new archive.

Parameters:

archiveName -

Returns:

the archive writer

Throws:

IOException

delete

boolean delete(@NotNull
               @NotNull String archiveName)

Deletes the archive if exists.

Parameters:

archiveName -

Returns:

true if the archive was removed, false otherwise

renameTo

boolean renameTo(@NotNull
                 @NotNull String from,
                 @NotNull
                 @NotNull String to)

Renames the archive.

Parameters:

from - the existing archive

to - new name

Returns:

true if the archive was renamed, false otherwise

copyFile

void copyFile(@NotNull
              @NotNull String from,
              @NotNull
              @NotNull String to)
       throws IOException

Copies the archive with all the segments.

Parameters:

from - the existing archive

to - new name

Throws:

IOException

exists

boolean exists(@NotNull
               @NotNull String archiveName)

Check if archive exists.

Parameters:

archiveName - archive to check

Returns:

true if archive exists, false otherwise

recoverEntries

void recoverEntries(@NotNull
                    @NotNull String archiveName,
                    @NotNull
                    @NotNull LinkedHashMap<UUID,byte[]> entries)
             throws IOException

Finds all the segments included in the archive.

Parameters:

archiveName - archive to recover

entries - results will be put there, in the order of presence in the archive

Throws:

IOException