Class InitPageOperation

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.InitPageOperation

All Implemented Interfaces:

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

public final class InitPageOperation
extends PhysicalPageOperation

This operation initializes the page that is being allocated, this operation does not change the alloc page information.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected int	initFlag
protected int	nextRecordId
protected boolean	overflowPage
protected int	pageFormatId
protected long	pageOffset
protected boolean	reuse

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
InitPageOperation()
InitPageOperation(BasePage page, int flag, int formatid, long offset)

Method Summary

Modifier and Type	Method	Description
void	doMe(Transaction xact, LogInstant instant, LimitObjectInput in)	Mark the page as valid, and clear out any crud from the page
protected BasePage	getPageForRedoRecovery(Transaction xact)	If we are in load tran, this page may not exist for the container yet.
int	getTypeFormatId()	Return my format identifier.
void	readExternal(ObjectInput in)	Read this in
void	restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in)	restore the before image of the page
String	toString()
void	undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in)	Mark the page as free
void	writeExternal(ObjectOutput out)	Write this out.

Methods inherited from class PhysicalPageOperation

generateUndo

Methods inherited from class PageBasicOperation

findpage, getPage, 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

nextRecordId

protected int nextRecordId

initFlag

protected int initFlag

pageFormatId

protected int pageFormatId

pageOffset

protected long pageOffset

reuse

protected boolean reuse

overflowPage

protected boolean overflowPage

Constructor Details

InitPageOperation

InitPageOperation(BasePage page,
 int flag,
 int formatid,
 long offset)
           throws StandardException

Throws:

StandardException

InitPageOperation

public InitPageOperation()

Method Details

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Write this out.

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class PageBasicOperation

Throws:

IOException - error writing to log stream

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Read this in

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class PageBasicOperation

Throws:

IOException - error reading from log stream

ClassNotFoundException - log stream corrupted

getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Returns:

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

doMe

public void doMe(Transaction xact,
 LogInstant instant,
 LimitObjectInput in)
          throws StandardException,
IOException

Mark the page as valid, and clear out any crud from the page

Parameters:

xact - the Transaction

instant - the log instant of this operation

in - optional data

Throws:

IOException - Can be thrown by any of the methods of ObjectInput.

StandardException - Standard Derby policy.

See Also:

• Loggable.doMe(Transaction, LogInstant, LimitObjectInput)

getPageForRedoRecovery

protected BasePage getPageForRedoRecovery(Transaction xact)
                                   throws StandardException

If we are in load tran, this page may not exist for the container yet. We need to create it first. This routine is called as the last resort of find page, the container handle has already been found and it is not dropped.

Overrides:

getPageForRedoRecovery in class PageBasicOperation

Throws:

StandardException - Standard Derby policy.

undoMe

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

Mark the page as free

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

IOException - 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)
               throws StandardException,
IOException

restore the before image of the page

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

Throws:

StandardException - Standard Derby Error Policy

IOException - problem reading the complete log record from the input stream

toString

public String toString()

Overrides:

toString in class PageBasicOperation