Class DeleteOperation
- 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.LogicalPageOperation
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- org.apache.derby.impl.store.raw.data.DeleteOperation
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
,Formatable
,TypedFormat
,Loggable
,LogicalUndoable
,RePreparable
,Undoable
public final class DeleteOperation extends LogicalPageOperation
Represents a delete (or undelete) of a record in a page.- See Also:
- Serialized Form
Format ID LOGOP_DELETE the formatId is written by FormatIdOutputStream when this object is written out by writeObject Purpose delete a record from a page. Upgrade Disk Layout LogicalPageOperation the super class doMeSlot(CompressedInt) the slot of the record to delete delete(boolean) if true, delete, else undelete OptionalData if we need logical undo, write the row that was deleted as the optional data. If we don't need logical undo, no optional data
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Field Summary
Fields Modifier and Type Field Description protected boolean
delete
protected int
doMeSlot
protected ByteArray
preparedLog
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Fields inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation
recordId, undo
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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 DeleteOperation()
DeleteOperation(RawTransaction t, BasePage page, int slot, int recordId, boolean delete, LogicalUndo undo)
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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)
Mark the record as deleted on the page.ByteArray
getPreparedLog()
the default for optional data is set to null.int
getTypeFormatId()
Return my format identifier.void
readExternal(java.io.ObjectInput in)
Read this invoid
restoreLoggedRow(java.lang.Object[] row, LimitObjectInput in)
Restore the row stored in the optional data of the log record.void
restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)
restore the before image of the pagejava.lang.String
toString()
void
undoMe(Transaction xact, BasePage undoPage, int undoRecordId, LogInstant CLRInstant, LimitObjectInput in)
Mark the record as not deleted, and then fix up the in-memory copy of the page.void
writeExternal(java.io.ObjectOutput out)
Write this out.private void
writeOptionalDataToBuffer(RawTransaction t)
if logical undo, writes out the row that was deleted-
Methods inherited from class org.apache.derby.impl.store.raw.data.LogicalPageOperation
generateUndo, getContainer, getRecordHandle, reclaimPrepareLocks, resetRecordHandle
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Methods inherited from class org.apache.derby.impl.store.raw.data.PageBasicOperation
findpage, getPage, getPageForRedoRecovery, getPageId, getPageVersion, group, needsRedo, releaseResource, resetPageNumber
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.apache.derby.iapi.store.raw.Loggable
group, needsRedo, releaseResource
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Field Detail
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doMeSlot
protected int doMeSlot
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delete
protected boolean delete
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preparedLog
protected transient ByteArray preparedLog
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Constructor Detail
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DeleteOperation
DeleteOperation(RawTransaction t, BasePage page, int slot, int recordId, boolean delete, LogicalUndo undo) throws StandardException
- Throws:
StandardException
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DeleteOperation
public DeleteOperation()
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Method Detail
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writeExternal
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
Write this out.- Specified by:
writeExternal
in interfacejava.io.Externalizable
- Overrides:
writeExternal
in classLogicalPageOperation
- Throws:
java.io.IOException
- error writing to log stream
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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 classLogicalPageOperation
- Throws:
java.io.IOException
- error reading from log streamjava.lang.ClassNotFoundException
- log stream corrupted
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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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doMe
public void doMe(Transaction xact, LogInstant instant, LimitObjectInput in) throws StandardException, java.io.IOException
Mark the record as deleted on the page.- 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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undoMe
public void undoMe(Transaction xact, BasePage undoPage, int undoRecordId, LogInstant CLRInstant, LimitObjectInput in) throws StandardException, java.io.IOException
Mark the record as not deleted, and then fix up the in-memory copy of the page. All logical undo logic has already been taken care of by generateUndo.- Specified by:
undoMe
in classLogicalPageOperation
- Parameters:
xact
- the Transaction doing the rollbackundoPage
- the page to rollback changes onundoRecordId
- the recordId to rollback changes onCLRInstant
- the log instant of this (PageUndo) operationin
- optional data for the rollback operation- Throws:
StandardException
- Thrown by methods I calljava.io.IOException
- Thrown by methods I call- See Also:
LogicalPageOperation.undoMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.impl.store.raw.data.BasePage, int, org.apache.derby.iapi.store.raw.log.LogInstant, org.apache.derby.iapi.services.io.LimitObjectInput)
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restoreLoggedRow
public void restoreLoggedRow(java.lang.Object[] row, LimitObjectInput in) throws StandardException, java.io.IOException
Restore the row stored in the optional data of the log record.- Parameters:
row
- an IN/OUT parameter, caller passed in the row with the correct column number and type, the log operation will restore the row with the optional data stored in the log record.- Throws:
java.io.IOException
- error reading from log streamStandardException
- Standard Derby error policy- See Also:
LogicalUndo
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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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getPreparedLog
public ByteArray getPreparedLog()
Description copied from class:PageBasicOperation
the default for optional data is set to null. If an operation has optional data, the operation need to prepare the optional data for this method. WARNING: If a log operation extends this class, and the operation has optional data, it MUST overwrite this method to return a ByteArray that contains the optional data.- Specified by:
getPreparedLog
in interfaceLoggable
- Overrides:
getPreparedLog
in classPageBasicOperation
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writeOptionalDataToBuffer
private void writeOptionalDataToBuffer(RawTransaction t) throws StandardException, java.io.IOException
if logical undo, writes out the row that was deleted- Throws:
java.io.IOException
- Can be thrown by any of the methods of ObjectOutputStandardException
- Standard Derby policy.
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toString
public java.lang.String toString()
- Overrides:
toString
in classPageBasicOperation
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