org.apache.derby.impl.store.raw.data
Class AllocPageOperation

java.lang.Object
  extended byorg.apache.derby.impl.store.raw.data.PageBasicOperation
      extended byorg.apache.derby.impl.store.raw.data.PhysicalPageOperation
          extended byorg.apache.derby.impl.store.raw.data.AllocPageOperation
All Implemented Interfaces:
java.io.Externalizable, Formatable, Loggable, RePreparable, java.io.Serializable, TypedFormat, Undoable

public final class AllocPageOperation
extends PhysicalPageOperation

See Also:
Serialized Form

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, 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(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, 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

doStatus

protected int doStatus

undoStatus

protected int undoStatus
Constructor Detail

AllocPageOperation

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


Apache Derby V10.0 Engine Documentation - Copyright © 1997,2004 The Apache Software Foundation or its licensors, as applicable.