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

java.lang.Object
  org.apache.derby.impl.store.raw.data.PageBasicOperation
      org.apache.derby.impl.store.raw.data.PhysicalPageOperation

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

Direct Known Subclasses:

AllocPageOperation, ChainAllocPageOperation, CompressSpacePageOperation, CopyRowsOperation, InitPageOperation, InvalidatePageOperation, PurgeOperation, UpdateOperation

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public abstract class PhysicalPageOperation

extends PageBasicOperation

implements org.apache.derby.iapi.store.raw.Undoable

An abstract class that is used for physical log operation. A physical log operation is one where the undo of the operation must be applied to the same page as the original operation, and the undo operation must store the byte image of the row(s) changed to its before image. (If a logical page operation happened to the page or if another transaction altered other rows on the page, the undo of this operation will only restore the before image of the row(s) affected).

Field Summary


 


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



 
PhysicalPageOperation()



           



protected 
PhysicalPageOperation(BasePage page)



           


 






Method Summary



 org.apache.derby.iapi.store.raw.Compensation
generateUndo(org.apache.derby.iapi.store.raw.Transaction xact,
             org.apache.derby.iapi.services.io.LimitObjectInput in)



          Generate a Compensation (PageUndoOperation) that will rollback the
          changes of this page operation.



abstract  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)



          Undo the change indicated by this log operation and optional data.


 


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


findpage, getPage, getPageForLoadTran, getPageId, getPageVersion, getPreparedLog, group, needsRedo, readExternal, reclaimPrepareLocks, releaseResource, resetPageNumber, restoreMe, toString, writeExternal


 


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


doMe, getPreparedLog, group, needsRedo, releaseResource


 


Methods inherited from interface java.io.Externalizable


readExternal, writeExternal


 


Methods inherited from interface org.apache.derby.iapi.services.io.TypedFormat


getTypeFormatId


 











Constructor Detail




PhysicalPageOperation
protected PhysicalPageOperation(BasePage page)





PhysicalPageOperation
public PhysicalPageOperation()









Method Detail




generateUndo
public org.apache.derby.iapi.store.raw.Compensation generateUndo(org.apache.derby.iapi.store.raw.Transaction xact,
                                                                 org.apache.derby.iapi.services.io.LimitObjectInput in)
                                                          throws org.apache.derby.iapi.error.StandardException

Generate a Compensation (PageUndoOperation) that will rollback the
          changes of this page operation. If this Page operation cannot or need not
          be rolled back (redo only), overwrite this function to return null.

          
Note
 For operation that needs logical undo, use
          LogicalUndoOperation instead  This implementation just finds
          the same page that the PageOperation was applied on - i.e., only works
          for undo on the same page.  

          
During recovery redo, the logging system is page oriented and will use
          the pageID stored in the PageUndoOperation to find the page.  The
          page will be latched and released using the default findpage and
          releaseResource - this.releaseResource() will still be called so it has
          to know not to release any resource it did not acquire.


Specified by:
generateUndo in interface org.apache.derby.iapi.store.raw.Undoable








undoMe
public abstract 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,
                            java.io.IOException

Undo the change indicated by this log operation and optional data.
                The page the undo should apply to is the latched undoPage, the
                recordId is the same as the roll forward operation.  

                
In this RawStore implementation, should only only be called via
                CompOp.doMe.

                
 The available() method of in indicates how much data can be read, i.e.
                how much was originally written.

















  

  
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