org.openrdf.store.blob.disk

Class DiskBlobVersion

java.lang.Object

org.openrdf.store.blob.disk.DiskBlobVersion

All Implemented Interfaces:

BlobVersion

public class DiskBlobVersion
extends Object
implements BlobVersion

Contains version information for a DiskBlob.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DiskBlobVersion(DiskBlobStore store, String version, File file)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addOpenBlobs(Collection<String> set)
void	commit() Makes the changes to the open blobs in this BlobVersion available to others.
boolean	equals(Object obj)
boolean	erase() Reverts all committed changes to blobs from this BlobVersion.
protected File	getDirectory()
String[]	getModifications() Blobs that have been modified in this version.
protected String	getVersion()
int	hashCode()
protected boolean	isObsolete()
protected boolean	mkdirs(File dir)
BlobObject	open(String uri) Opens a BlobObject for reading or writing if this BlobVersion has not be committed.
protected OutputStream	openOutputStream(File file)
protected Writer	openWriter(File file, boolean append)
void	prepare() Prevents any further changes to the store from other threads until BlobVersion.commit() or BlobVersion.rollback() is called from this thread.
protected Lock	readLock()
void	rollback() Aborts all uncommitted changes to blobs, restoring the initial state of this BlobVersion.
String	toString()
protected boolean	unwatch(String uri, DiskListener listener)
protected void	watch(String uri, DiskListener listener)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DiskBlobVersion

protected DiskBlobVersion(DiskBlobStore store,
               String version,
               File file)
                   throws IOException

Throws:

IOException

Method Detail

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

getModifications

public String[] getModifications()
                          throws IOException

Description copied from interface: BlobVersion

Blobs that have been modified in this version.

Specified by:

getModifications in interface BlobVersion

Throws:

IOException

open

public BlobObject open(String uri)

Description copied from interface: BlobVersion

Opens a BlobObject for reading or writing if this BlobVersion has not be committed. Opens a read-only BlobObject using this version if this BlobVersion is closed.

Specified by:

open in interface BlobVersion

prepare

public void prepare()
             throws IOException

Description copied from interface: BlobVersion

Prevents any further changes to the store from other threads until BlobVersion.commit() or BlobVersion.rollback() is called from this thread. Checks that the blobs read or written in this BlobVersion were not changed in another BlobVersion since they were opened.

Specified by:

prepare in interface BlobVersion

Throws:

IOException - if a blob opened in this BlobVersion had since changed.

commit

public void commit()
            throws IOException

Description copied from interface: BlobVersion

Makes the changes to the open blobs in this BlobVersion available to others. This method can only be called at most once for a given BlobVersion; once this method is called this state is closed and only the modified blobs can be opened.

Specified by:

commit in interface BlobVersion

Throws:

IOException - if a blob opened in this BlobVersion had since changed.

rollback

public void rollback()

Description copied from interface: BlobVersion

Aborts all uncommitted changes to blobs, restoring the initial state of this BlobVersion.

Specified by:

rollback in interface BlobVersion

erase

public boolean erase()
              throws IOException

Description copied from interface: BlobVersion

Reverts all committed changes to blobs from this BlobVersion.

Specified by:

erase in interface BlobVersion

Returns:

true if all blobs of this version were removed successfully.

Throws:

IOException

addOpenBlobs

protected void addOpenBlobs(Collection<String> set)

isObsolete

protected boolean isObsolete()
                      throws IOException

Throws:

IOException

getDirectory

protected File getDirectory()

mkdirs

protected boolean mkdirs(File dir)

openOutputStream

protected OutputStream openOutputStream(File file)
                                 throws IOException

Throws:

IOException

openWriter

protected Writer openWriter(File file,
                boolean append)
                     throws IOException

Throws:

IOException

getVersion

protected String getVersion()

watch

protected void watch(String uri,
         DiskListener listener)

unwatch

protected boolean unwatch(String uri,
              DiskListener listener)

readLock

protected Lock readLock()