Class PhysicalPageOperation
java.lang.Object
org.apache.derby.impl.store.raw.data.PageBasicOperation
org.apache.derby.impl.store.raw.data.PhysicalPageOperation
- All Implemented Interfaces:
Externalizable
,Serializable
,Formatable
,TypedFormat
,Loggable
,RePreparable
,Undoable
- Direct Known Subclasses:
AllocPageOperation
,ChainAllocPageOperation
,CompressSpacePageOperation
,CopyRowsOperation
,InitPageOperation
,InvalidatePageOperation
,PurgeOperation
,UpdateOperation
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).
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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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiongenerateUndo
(Transaction xact, LimitObjectInput in) Generate a Compensation (PageUndoOperation) that will rollback the changes of this page operation.abstract void
undoMe
(Transaction xact, BasePage undoPage, LogInstant CLRinstant, 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, getPageForRedoRecovery, 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 java.io.Externalizable
readExternal, writeExternal
Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable
doMe, getPreparedLog, group, needsRedo, releaseResource
Methods inherited from interface org.apache.derby.iapi.services.io.TypedFormat
getTypeFormatId
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Constructor Details
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PhysicalPageOperation
PhysicalPageOperation(BasePage page) -
PhysicalPageOperation
public PhysicalPageOperation()
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Method Details
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generateUndo
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 interfaceUndoable
- Parameters:
xact
- the transaction doing the compensatingin
- optional input- Returns:
- the compensation operation that will rollback this change
- Throws:
StandardException
- Standard Derby policy.- See Also:
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undoMe
public abstract void undoMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in) throws StandardException, 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.
- Parameters:
xact
- the Transaction doing the rollbackundoPage
- the page to rollback changes onCLRinstant
- the log instant of this (PageUndo) operationin
- optional data for the rollback operation- Throws:
IOException
- Can be thrown by any of the methods of ObjectInput.StandardException
- Standard Derby policy.
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