Class SetReservedSpaceOperation
- java.lang.Object
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- org.apache.derby.impl.store.raw.data.PageBasicOperation
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- org.apache.derby.impl.store.raw.data.SetReservedSpaceOperation
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
,Formatable
,TypedFormat
,Loggable
,RePreparable
public final class SetReservedSpaceOperation extends PageBasicOperation
Represents shrinking of the reserved space of a particular row on a page. This operation is not undoable.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected int
doMeSlot
protected int
newValue
protected int
oldValue
protected int
recordId
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Fields inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation
containerHdl, foundHere, page
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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 Constructor Description SetReservedSpaceOperation()
SetReservedSpaceOperation(BasePage page, int slot, int recordId, int newValue, int oldValue)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
doMe(Transaction xact, LogInstant instant, LimitObjectInput in)
Apply the change indicated by this operation and optional data.int
getTypeFormatId()
Return my format identifier.void
readExternal(java.io.ObjectInput in)
Read this invoid
restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)
restore the before image of the pagejava.lang.String
toString()
DEBUG: Print self.void
writeExternal(java.io.ObjectOutput out)
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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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Constructor Detail
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SetReservedSpaceOperation
SetReservedSpaceOperation(BasePage page, int slot, int recordId, int newValue, int oldValue)
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SetReservedSpaceOperation
public SetReservedSpaceOperation()
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Method Detail
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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
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
- Specified by:
writeExternal
in interfacejava.io.Externalizable
- Overrides:
writeExternal
in classPageBasicOperation
- Throws:
java.io.IOException
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readExternal
public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
Read this in- Specified by:
readExternal
in interfacejava.io.Externalizable
- Overrides:
readExternal
in classPageBasicOperation
- Throws:
java.io.IOException
- error reading from log streamjava.lang.ClassNotFoundException
- log stream corrupted
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doMe
public void doMe(Transaction xact, LogInstant instant, LimitObjectInput in) throws StandardException, java.io.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:
java.io.IOException
- Can be thrown by any of the methods of ObjectInput.StandardException
- Standard Derby policy.- See Also:
Loggable.doMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.LimitObjectInput)
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restoreMe
public void restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in) throws StandardException, java.io.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 Policyjava.io.IOException
- problem reading the complete log record from the input stream
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toString
public java.lang.String toString()
DEBUG: Print self.- Overrides:
toString
in classPageBasicOperation
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