Class ChainAllocPageOperation

java.lang.Object

org.apache.derby.impl.store.raw.data.PageBasicOperation

org.apache.derby.impl.store.raw.data.PhysicalPageOperation

org.apache.derby.impl.store.raw.data.ChainAllocPageOperation

All Implemented Interfaces:

Externalizable, Serializable, Formatable, TypedFormat, Loggable, RePreparable, Undoable

public final class ChainAllocPageOperation
extends PhysicalPageOperation

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected long	newAllocPageNum
protected long	newAllocPageOffset

Fields inherited from class PageBasicOperation

containerHdl, foundHere, page

Fields inherited from interface Loggable

ABORT, BI_LOG, CHECKSUM, COMMIT, COMPENSATION, FILE_RESOURCE, FIRST, LAST, PREPARE, RAWSTORE, XA_NEEDLOCK

Constructor Summary

Constructors

Constructor	Description
ChainAllocPageOperation()
ChainAllocPageOperation(AllocPage allocPage, long pageNumber, long pageOffset)

Method Summary

Modifier and Type	Method	Description
final void	doMe(Transaction tran, LogInstant instant, LimitObjectInput in)	Link the next alloc page into the page chain
int	getTypeFormatId()	Return my format identifier.
void	readExternal(ObjectInput in)
void	restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)	Undo the change indicated by this log operation and optional data.
String	toString()	debug
void	undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in)	Unlink the next alloc page from the page chain
void	writeExternal(ObjectOutput out)

Methods inherited from class PhysicalPageOperation

generateUndo

Methods inherited from class PageBasicOperation

findpage, getPage, getPageForRedoRecovery, getPageId, getPageVersion, getPreparedLog, group, needsRedo, reclaimPrepareLocks, releaseResource, resetPageNumber

Methods inherited from class Object

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

Methods inherited from interface Loggable

getPreparedLog, group, needsRedo, releaseResource

Field Details

newAllocPageNum

protected long newAllocPageNum

newAllocPageOffset

protected long newAllocPageOffset

Constructor Details

ChainAllocPageOperation

ChainAllocPageOperation(AllocPage allocPage,
 long pageNumber,
 long pageOffset)
                 throws StandardException

Throws:

StandardException

ChainAllocPageOperation

public ChainAllocPageOperation()

Method Details

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class PageBasicOperation

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class PageBasicOperation

Throws:

IOException - error reading from log stream

ClassNotFoundException - cannot read object from input

getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Returns:

The identifier. (A UUID stuffed in an array of 16 bytes).

doMe

public final void doMe(Transaction tran,
 LogInstant instant,
 LimitObjectInput in)
                throws StandardException

Link the next alloc page into the page chain

Parameters:

tran - the Transaction

instant - the log instant of this operation

in - optional data

Throws:

StandardException - container Handle is not active

undoMe

public void undoMe(Transaction xact,
 BasePage undoPage,
 LogInstant CLRInstant,
 LimitObjectInput in)
            throws StandardException

Unlink the next alloc page from the page chain

Specified by:

undoMe in class PhysicalPageOperation

Parameters:

xact - the Transaction doing the rollback

undoPage - the page to rollback changes on

CLRInstant - the log instant of this (PageUndo) operation

in - optional data for the rollback operation

Throws:

StandardException - Thrown by methods I call

See Also:

• PhysicalPageOperation.undoMe(Transaction, BasePage, LogInstant, LimitObjectInput)

restoreMe

public void restoreMe(Transaction xact,
 BasePage undoPage,
 LogInstant CLRinstant,
 LimitObjectInput in)

Description copied from class: PageBasicOperation

Undo the change indicated by this log operation and optional data. The page the undo should apply to is the latched undoPage. The undoPage must be the same page as the doMe page and the undo operation must restore the before image of the row that changed.
this can only be used under special circumstances: namely table level locking, and no internal or nested transaction, and all operations are rollec back with restoreMe instead of undoMe.
This method is here to support BeforeImageLogging

Specified by:

restoreMe in class PageBasicOperation

Parameters:

xact - the Transaction doing the rollback

undoPage - the page to rollback changes on

CLRinstant - the log instant of this (PageUndo) operation

in - optional data for the rollback operation

toString

public String toString()

debug

Overrides:

toString in class PageBasicOperation