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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, org.apache.derby.iapi.services.io.Formatable, org.apache.derby.iapi.store.raw.Loggable, org.apache.derby.iapi.store.raw.RePreparable, java.io.Serializable, org.apache.derby.iapi.services.io.TypedFormat, org.apache.derby.iapi.store.raw.Undoable

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public final class AllocPageOperation

extends PhysicalPageOperation

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Field Summary
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

AllocPageOperation()

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

 

Method Summary
void	doMe(org.apache.derby.iapi.store.raw.Transaction tran, org.apache.derby.iapi.store.raw.log.LogInstant instant, org.apache.derby.iapi.services.io.LimitObjectInput in)           Allocate/deallocate/free this page number
int	getTypeFormatId()           Return my format identifier.
void	readExternal(java.io.ObjectInput in)           This method restores an object's state by reading in the instance data for the object from the passed in stream.
void	restoreMe(org.apache.derby.iapi.store.raw.Transaction xact, BasePage undoPage, org.apache.derby.iapi.store.raw.log.LogInstant CLRinstant, org.apache.derby.iapi.services.io.LimitObjectInput in)           Undo the change indicated by this log operation and optional data.
java.lang.String	toString()           debug
void	undoMe(org.apache.derby.iapi.store.raw.Transaction xact, BasePage undoPage, org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant, org.apache.derby.iapi.services.io.LimitObjectInput in)           Allocate/deallocate/free this page number.
void	writeExternal(java.io.ObjectOutput out)           This method is responsible for writing the instance data of an object to the passed in stream.

 

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, getPageForLoadTran, 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

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doStatus

protected int doStatus

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undoStatus

protected int undoStatus

Constructor Detail

AllocPageOperation

public AllocPageOperation(AllocPage allocPage,
                          long pageNumber,
                          int doStatus,
                          int undoStatus)
                   throws org.apache.derby.iapi.error.StandardException

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AllocPageOperation

public AllocPageOperation()

Method Detail

writeExternal

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

Description copied from interface: java.io.Externalizable

This method is responsible for writing the instance data of an object to the passed in stream. Note that this stream is not a subclass of OutputStream, but rather is a class that implements the ObjectOutput interface. That interface provides a number of methods for writing Java data values to a stream.

Not that the implementation of this method must be coordinated with the implementation of readExternal.

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class PageBasicOperation

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readExternal

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

Description copied from interface: java.io.Externalizable

This method restores an object's state by reading in the instance data for the object from the passed in stream. Note that this stream is not a subclass of InputStream, but rather is a class that implements the ObjectInput interface. That interface provides a mechanism for reading in Java data types from a stream.

Note that this method must be compatible with writeExternal. It must read back the exact same types that were written by that method in the exact order they were written.

If this method needs to read back an object instance, then the class for that object must be found and loaded. If that operation fails, then this method throws a ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class PageBasicOperation

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getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

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doMe

public final void doMe(org.apache.derby.iapi.store.raw.Transaction tran,
                       org.apache.derby.iapi.store.raw.log.LogInstant instant,
                       org.apache.derby.iapi.services.io.LimitObjectInput in)
                throws org.apache.derby.iapi.error.StandardException

Allocate/deallocate/free this page number

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undoMe

public void undoMe(org.apache.derby.iapi.store.raw.Transaction xact,
                   BasePage undoPage,
                   org.apache.derby.iapi.store.raw.log.LogInstant CLRInstant,
                   org.apache.derby.iapi.services.io.LimitObjectInput in)
            throws org.apache.derby.iapi.error.StandardException

Allocate/deallocate/free this page number.

Specified by:

undoMe in class PhysicalPageOperation

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restoreMe

public void restoreMe(org.apache.derby.iapi.store.raw.Transaction xact,
                      BasePage undoPage,
                      org.apache.derby.iapi.store.raw.log.LogInstant CLRinstant,
                      org.apache.derby.iapi.services.io.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

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toString

public java.lang.String toString()

debug

Overrides:

toString in class PageBasicOperation

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Home >> All >> org >> apache >> derby >> impl >> store >> raw >> [ data overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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