Module org.apache.jena.tdb

Package org.apache.jena.tdb1.transaction

Class ObjectFileTransComplex

java.lang.Object

org.apache.jena.tdb1.transaction.ObjectFileTransComplex

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, ObjectFile, TransactionLifecycle

public class ObjectFileTransComplex
extends Object
implements ObjectFile, TransactionLifecycle

This version works with two files - the main, base file and a per-transaction journal file. It writes to the journal side. To flush, it writes the journal to the base file. It is relatively untested. This is not the normal implementation of a transactional ObjectFile.

See Also:

• ObjectFileTrans

Field Summary

Fields inherited from interface org.apache.jena.tdb1.base.objectfile.ObjectFile

type

Constructor Summary

Constructors

Constructor	Description
ObjectFileTransComplex(Transaction txn, ObjectFile base, ObjectFile other)

Method Summary

Modifier and Type	Method	Description
void	abort(Transaction txn)	End of active phase - will not be making these changes.
Iterator<org.apache.jena.atlas.lib.Pair<Long,ByteBuffer>>	all()	All the contents as ByteBuffers - debugging aid
void	begin(Transaction txn)	Start an update transaction
void	clearupCommitted(Transaction txn)	All done - transaction committed and incorporated in the base dataset - can now tidy up - called during journal flush if commiting.
void	close()
void	commitPrepare(Transaction txn)	Prepare to commit; end of active phase.
void	committed(Transaction txn)	The commit has happened
void	enactCommitted(Transaction txn)	Update the base data - called during journal flush.
String	getLabel()	A label to identify this ObjectFile
boolean	isEmpty()	Any objects in this file?
long	length()	Length, in units used by read/write for ids
ByteBuffer	read(long id)	Read a buffer at the accessor number.
void	reposition(long id)	Reset the "append" point; may only be moved earlier.
void	sync()
void	truncate(long id)	Truncate the file
long	write(ByteBuffer buffer)	Write out the buffer - return the accessor number

Methods inherited from class java.lang.Object

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

Constructor Details

ObjectFileTransComplex

public ObjectFileTransComplex(Transaction txn,
 ObjectFile base,
 ObjectFile other)

Method Details

begin

public void begin(Transaction txn)

Description copied from interface: TransactionLifecycle

Start an update transaction

Specified by:

begin in interface TransactionLifecycle

commitPrepare

public void commitPrepare(Transaction txn)

Description copied from interface: TransactionLifecycle

Prepare to commit; end of active phase. Make changes safe; do not update the base data.

Specified by:

commitPrepare in interface TransactionLifecycle

committed

public void committed(Transaction txn)

Description copied from interface: TransactionLifecycle

The commit has happened

Specified by:

committed in interface TransactionLifecycle

enactCommitted

public void enactCommitted(Transaction txn)

Description copied from interface: TransactionLifecycle

Update the base data - called during journal flush.

Specified by:

enactCommitted in interface TransactionLifecycle

clearupCommitted

public void clearupCommitted(Transaction txn)

Description copied from interface: TransactionLifecycle

All done - transaction committed and incorporated in the base dataset - can now tidy up - called during journal flush if commiting.

Specified by:

clearupCommitted in interface TransactionLifecycle

abort

public void abort(Transaction txn)

Description copied from interface: TransactionLifecycle

End of active phase - will not be making these changes.

Specified by:

abort in interface TransactionLifecycle

reposition

public void reposition(long id)

Description copied from interface: ObjectFile

Reset the "append" point; may only be moved earlier. The new position must correspond to a position returned by ObjectFile.write(ByteBuffer).

Specified by:

reposition in interface ObjectFile

truncate

public void truncate(long id)

Description copied from interface: ObjectFile

Truncate the file

Specified by:

truncate in interface ObjectFile

write

public long write(ByteBuffer buffer)

Description copied from interface: ObjectFile

Write out the buffer - return the accessor number

Specified by:

write in interface ObjectFile

read

public ByteBuffer read(long id)

Description copied from interface: ObjectFile

Read a buffer at the accessor number.

Specified by:

read in interface ObjectFile

length

public long length()

Description copied from interface: ObjectFile

Length, in units used by read/write for ids

Specified by:

length in interface ObjectFile

isEmpty

public boolean isEmpty()

Description copied from interface: ObjectFile

Any objects in this file?

Specified by:

isEmpty in interface ObjectFile

all

public Iterator<org.apache.jena.atlas.lib.Pair<Long,ByteBuffer>> all()

Description copied from interface: ObjectFile

All the contents as ByteBuffers - debugging aid

Specified by:

all in interface ObjectFile

sync

public void sync()

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync

close

public void close()

Specified by:

close in interface org.apache.jena.atlas.lib.Closeable

getLabel

public String getLabel()

Description copied from interface: ObjectFile

A label to identify this ObjectFile

Specified by:

getLabel in interface ObjectFile