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

Class AllocPageOperation

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.AllocPageOperation

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Formatable, TypedFormat, Loggable, RePreparable, Undoable

public final class AllocPageOperation
extends PhysicalPageOperation

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	doStatus
protected long	newPageNumber
protected int	undoStatus

Fields inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation

containerHdl, foundHere, page

Fields inherited from interface org.apache.derby.iapi.store.raw.Loggable

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

Constructor Summary

Constructors

Constructor	Description
AllocPageOperation()
AllocPageOperation(AllocPage allocPage, long pageNumber, int doStatus, int undoStatus)

Method Summary

Modifier and Type	Method	Description
void	doMe(Transaction tran, LogInstant instant, LimitObjectInput in)	Allocate/deallocate/free this page number
int	getTypeFormatId()	Return my format identifier.
void	readExternal(java.io.ObjectInput in)
void	restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)	Undo the change indicated by this log operation and optional data.
java.lang.String	toString()	debug
void	undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in)	Allocate/deallocate/free this page number.
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class org.apache.derby.impl.store.raw.data.PhysicalPageOperation

generateUndo

Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable

getPreparedLog, group, needsRedo, releaseResource

Field Detail

newPageNumber

protected long newPageNumber

doStatus

protected int doStatus

undoStatus

protected int undoStatus

Constructor Detail

AllocPageOperation

AllocPageOperation(AllocPage allocPage,
                   long pageNumber,
                   int doStatus,
                   int undoStatus)
            throws StandardException

Throws:

StandardException

AllocPageOperation

public AllocPageOperation()

Method Detail

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class PageBasicOperation

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class PageBasicOperation

Throws:

java.io.IOException - error reading from log stream

java.lang.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

Allocate/deallocate/free this page number

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

Allocate/deallocate/free this page number.

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(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.impl.store.raw.data.BasePage, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.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 java.lang.String toString()

debug

Overrides:

toString in class PageBasicOperation