Class CompressSpacePageOperation
- 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.PhysicalPageOperation
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- org.apache.derby.impl.store.raw.data.CompressSpacePageOperation
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
,Formatable
,TypedFormat
,Loggable
,RePreparable
,Undoable
- Direct Known Subclasses:
CompressSpacePageOperation10_2
public class CompressSpacePageOperation extends PhysicalPageOperation
Log operation to implement compressing space from a container and returning it to the operating system.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected int
newHighestPage
The new highest page on this allocation page.protected int
num_pages_truncated
The number of allocated pages in this allocation page prior to the truncate.-
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 CompressSpacePageOperation()
Public Methods of Formatable interface.CompressSpacePageOperation(AllocPage allocPage, int highest_page, int num_truncated)
Constructors for This class:
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
doMe(Transaction tran, LogInstant instant, LimitObjectInput in)
Compress space from container.int
getTypeFormatId()
Return my format identifier.void
readExternal(java.io.ObjectInput in)
void
restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)
Undo the change indicated by this log operation and optional data.java.lang.String
toString()
debugvoid
undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in)
Compress space undo.void
writeExternal(java.io.ObjectOutput out)
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Methods inherited from class org.apache.derby.impl.store.raw.data.PhysicalPageOperation
generateUndo
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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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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
getPreparedLog, group, needsRedo, releaseResource
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Field Detail
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newHighestPage
protected int newHighestPage
The new highest page on this allocation page. The number is the offset of the page in the array of pages maintained by this allocation page, for instance a value of 0 indicates all page except the first one are to be truncated. If all pages are truncated then the offset is set to -1.
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num_pages_truncated
protected int num_pages_truncated
The number of allocated pages in this allocation page prior to the truncate. Note that all pages from NewHighestPage+1 through newHighestPage+num_pages_truncated should be FREE.
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Constructor Detail
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CompressSpacePageOperation
CompressSpacePageOperation(AllocPage allocPage, int highest_page, int num_truncated) throws StandardException
Constructors for This class:- Throws:
StandardException
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CompressSpacePageOperation
public CompressSpacePageOperation()
Public Methods of Formatable interface.
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Method Detail
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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
- Specified by:
readExternal
in interfacejava.io.Externalizable
- Overrides:
readExternal
in classPageBasicOperation
- Throws:
java.io.IOException
- error reading from log streamjava.lang.ClassNotFoundException
- cannot read object from input
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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 final void doMe(Transaction tran, LogInstant instant, LimitObjectInput in) throws StandardException
Compress space from container.Compress the indicate space from the container, returning the free pages to the OS. Update the allocation page to reflect the file change.
- Parameters:
tran
- transaction doing the operation.instant
- log instant for this operation.in
- unused by this log operation.- Throws:
StandardException
- Standard exception policy.
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undoMe
public void undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in) throws StandardException
Compress space undo.- Specified by:
undoMe
in classPhysicalPageOperation
- 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
- Thrown by methods I call- See Also:
PhysicalPageOperation.undoMe(org.apache.derby.iapi.store.raw.Transaction, org.apache.derby.impl.store.raw.data.BasePage, 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)
Description copied from class:PageBasicOperation
Undo the change indicated by this log operation and optional data. The page the undo should apply to is the latched undoPage. The undoPage must be the same page as the doMe page and the undo operation must restore the before image of the row that changed.
this can only be used under special circumstances: namely table level locking, and no internal or nested transaction, and all operations are rollec back with restoreMe instead of undoMe.
This method is here to support BeforeImageLogging- 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
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toString
public java.lang.String toString()
debug- Overrides:
toString
in classPageBasicOperation
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