Class SetReservedSpaceOperation
java.lang.Object
org.apache.derby.impl.store.raw.data.PageBasicOperation
org.apache.derby.impl.store.raw.data.SetReservedSpaceOperation
- All Implemented Interfaces:
Externalizable
,Serializable
,Formatable
,TypedFormat
,Loggable
,RePreparable
Represents shrinking of the reserved space of a particular row on a page.
This operation is not undoable.
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected int
protected int
protected int
protected int
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
ConstructorsConstructorDescriptionSetReservedSpaceOperation
(BasePage page, int slot, int recordId, int newValue, int oldValue) -
Method Summary
Modifier and TypeMethodDescriptionvoid
doMe
(Transaction xact, LogInstant instant, LimitObjectInput in) Apply the change indicated by this operation and optional data.int
Return my format identifier.void
Read this invoid
restoreMe
(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in) restore the before image of the pagetoString()
DEBUG: Print self.void
Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation
findpage, getPage, getPageForRedoRecovery, getPageId, getPageVersion, getPreparedLog, group, needsRedo, reclaimPrepareLocks, releaseResource, resetPageNumber
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Field Details
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doMeSlot
protected int doMeSlot -
recordId
protected int recordId -
newValue
protected int newValue -
oldValue
protected int oldValue
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Constructor Details
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SetReservedSpaceOperation
SetReservedSpaceOperation(BasePage page, int slot, int recordId, int newValue, int oldValue) -
SetReservedSpaceOperation
public SetReservedSpaceOperation()
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Method Details
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getTypeFormatId
public int getTypeFormatId()Return my format identifier.- Returns:
- The identifier. (A UUID stuffed in an array of 16 bytes).
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writeExternal
- Specified by:
writeExternal
in interfaceExternalizable
- Overrides:
writeExternal
in classPageBasicOperation
- Throws:
IOException
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readExternal
Read this in- Specified by:
readExternal
in interfaceExternalizable
- Overrides:
readExternal
in classPageBasicOperation
- Throws:
IOException
- error reading from log streamClassNotFoundException
- log stream corrupted
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doMe
public void doMe(Transaction xact, LogInstant instant, LimitObjectInput in) throws StandardException, IOException Description copied from interface:Loggable
Apply the change indicated by this operation and optional data. If this method fail, the system will be shut down because the log record has already been written to disk. Moreover, the log record will be replayed during recovery and this doMe method will be called on the same page again, so if it fails again, recovery will fail and the database cannot be started. So it is very important to make sure that every resource you need, such as disk space, has been acquired before the logAndDo method is called!
This method cannot acquire any resource (like latching of a page) since it is called underneath the logging system, ie., the log record has already been written to the log stream.The available() method of in indicates how much data can be read, i.e. how much was originally written.
- Parameters:
xact
- the Transactioninstant
- the log instant of this operationin
- optional data- Throws:
IOException
- Can be thrown by any of the methods of ObjectInput.StandardException
- Standard Derby policy.- See Also:
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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 classPageBasicOperation
- 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:
StandardException
- Standard Derby Error PolicyIOException
- problem reading the complete log record from the input stream
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toString
DEBUG: Print self.- Overrides:
toString
in classPageBasicOperation
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