org.exist.storage.dom
Class UpdateHeaderLoggable

java.lang.Object
  org.exist.storage.journal.AbstractLoggable
      org.exist.storage.dom.UpdateHeaderLoggable

All Implemented Interfaces:

Loggable

public class UpdateHeaderLoggable

extends AbstractLoggable

Author:

wolf

Field Summary

protected long	nextPage
protected long	oldNext
protected long	oldPrev
protected long	pageNum
protected long	prevPage

Fields inherited from class org.exist.storage.journal.AbstractLoggable

lsn, transactId, type

Constructor Summary

UpdateHeaderLoggable(DBBroker broker, long transactId)

UpdateHeaderLoggable(Txn transaction, long prevPage, long pageNum, long nextPage, long oldPrev, long oldNext)

Method Summary

java.lang.String	dump() Default implementation returns the current LSN plus the class name of the Loggable instance.
int	getLogSize() Returns the size of the work load of this entry.
void	read(java.nio.ByteBuffer in) Read the entry.
void	redo() Redo the underlying operation.
void	undo() Undo, i.e.
void	write(java.nio.ByteBuffer out) Write this entry to the specified ByteBuffer.

Methods inherited from class org.exist.storage.journal.AbstractLoggable

clear, getLogType, getLsn, getTransactionId, setLsn

Methods inherited from class java.lang.Object

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

Field Detail

pageNum

protected long pageNum

nextPage

protected long nextPage

prevPage

protected long prevPage

oldNext

protected long oldNext

oldPrev

protected long oldPrev

Constructor Detail

UpdateHeaderLoggable

public UpdateHeaderLoggable(Txn transaction,
                            long prevPage,
                            long pageNum,
                            long nextPage,
                            long oldPrev,
                            long oldNext)

UpdateHeaderLoggable

public UpdateHeaderLoggable(DBBroker broker,
                            long transactId)

Method Detail

write

public void write(java.nio.ByteBuffer out)

Description copied from interface: Loggable

Write this entry to the specified ByteBuffer.

Parameters:

out -

read

public void read(java.nio.ByteBuffer in)

Description copied from interface: Loggable

Read the entry.

Parameters:

in -

getLogSize

public int getLogSize()

Description copied from interface: Loggable

Returns the size of the work load of this entry.

Returns:

redo

public void redo()
          throws LogException

Description copied from interface: Loggable

Redo the underlying operation. This method is called by RecoveryManager.

Specified by:

redo in interface Loggable

Overrides:

redo in class AbstractLoggable

Throws:

LogException

undo

public void undo()
          throws LogException

Description copied from interface: Loggable

Undo, i.e. roll back, the underlying operation. The method is called by RecoveryManager.

Specified by:

undo in interface Loggable

Overrides:

undo in class AbstractLoggable

Throws:

LogException

dump

public java.lang.String dump()

Description copied from class: AbstractLoggable

Default implementation returns the current LSN plus the class name of the Loggable instance.

Specified by:

dump in interface Loggable

Overrides:

dump in class AbstractLoggable