org.apache.jackrabbit.mk.blobs

Class FileBlobStore

java.lang.Object

org.apache.jackrabbit.mk.blobs.AbstractBlobStore

org.apache.jackrabbit.mk.blobs.FileBlobStore

All Implemented Interfaces:

BlobStore, GarbageCollectableBlobStore, Cache.Backend<AbstractBlobStore.BlockId,AbstractBlobStore.Data>

public class FileBlobStore
extends AbstractBlobStore

A file blob store.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.jackrabbit.mk.blobs.AbstractBlobStore

AbstractBlobStore.BlockId, AbstractBlobStore.Data

Field Summary

Fields inherited from class org.apache.jackrabbit.mk.blobs.AbstractBlobStore

BLOCK_SIZE_LIMIT, HASH_ALGORITHM, inUse, TYPE_DATA, TYPE_HASH, TYPE_HASH_COMPRESSED

Constructor Summary

Constructors

Constructor and Description
FileBlobStore(String dir)

Method Summary

Methods

Modifier and Type	Method and Description
protected boolean	isMarkEnabled()
protected void	mark(AbstractBlobStore.BlockId id)
protected byte[]	readBlockFromBackend(AbstractBlobStore.BlockId id) Load the block from the storage backend.
void	startMark() Start the mark phase.
protected void	storeBlock(byte[] digest, int level, byte[] data) Store a block of data.
int	sweep() Remove all unused blocks.
String	writeBlob(String tempFilePath) Write a blob from a temporary file.

Methods inherited from class org.apache.jackrabbit.mk.blobs.AbstractBlobStore

clearCache, clearInUse, getBlobLength, getBlockSize, getBlockSizeMin, load, mark, markInUse, readBlob, setBlockSize, setBlockSizeMin, usesBlobId, writeBlob

Methods inherited from class java.lang.Object

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

Constructor Detail

FileBlobStore

public FileBlobStore(String dir)

Method Detail

writeBlob

public String writeBlob(String tempFilePath)
                 throws IOException

Description copied from interface: GarbageCollectableBlobStore

Write a blob from a temporary file. The temporary file is removed afterwards. A file based blob stores might simply rename the file, so that no additional writes are necessary.

Specified by:

writeBlob in interface GarbageCollectableBlobStore

Overrides:

writeBlob in class AbstractBlobStore

Returns:

the blob id

Throws:

IOException

storeBlock

protected void storeBlock(byte[] digest,
              int level,
              byte[] data)
                   throws IOException

Description copied from class: AbstractBlobStore

Store a block of data.

Specified by:

storeBlock in class AbstractBlobStore

Parameters:

digest - the content hash

level - the indirection level (0 is for user data, 1 is a list of digests that point to user data, 2 is a list of digests that point to digests, and so on). This parameter is for informational use only, and it is not required to store it unless that's easy to achieve

data - the data to be stored

Throws:

IOException

readBlockFromBackend

protected byte[] readBlockFromBackend(AbstractBlobStore.BlockId id)
                               throws IOException

Description copied from class: AbstractBlobStore

Load the block from the storage backend. Returns null if the block was not found.

Specified by:

readBlockFromBackend in class AbstractBlobStore

Parameters:

id - the block id

Returns:

the block data, or null

Throws:

IOException

startMark

public void startMark()
               throws IOException

Description copied from interface: GarbageCollectableBlobStore

Start the mark phase.

Specified by:

startMark in interface GarbageCollectableBlobStore

Specified by:

startMark in class AbstractBlobStore

Throws:

IOException

isMarkEnabled

protected boolean isMarkEnabled()

Specified by:

isMarkEnabled in class AbstractBlobStore

mark

protected void mark(AbstractBlobStore.BlockId id)
             throws IOException

Specified by:

mark in class AbstractBlobStore

Throws:

IOException

sweep

public int sweep()
          throws IOException

Description copied from interface: GarbageCollectableBlobStore

Remove all unused blocks.

Specified by:

sweep in interface GarbageCollectableBlobStore

Specified by:

sweep in class AbstractBlobStore

Returns:

the number of removed blocks

Throws:

IOException