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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.raw.data

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.apache.derby.impl.store.raw.data .PageBasicOperation

org.apache.derby.impl.store.raw.data .PhysicalPageOperation

org.apache.derby.impl.store.raw.data .CompressSpacePageOperation

CompressSpacePageOperation
final public class CompressSpacePageOperation extends PhysicalPageOperation (Code)
	Log operation to implement compressing space from a container and returning it to the operating system.

Field Summary
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.

Constructor Summary
public	CompressSpacePageOperation(AllocPage allocPage, int highest_page, int num_truncated)
public	CompressSpacePageOperation() Public Methods of Formatable interface.

Method Summary
final public void	doMe(Transaction tran, LogInstant instant, LimitObjectInput in) Compress space from container. Compress the indicate space from the container, returning the free pages to the OS.
public int	getTypeFormatId() Return my format identifier.
public void	readExternal(ObjectInput in)
public void	restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)
public String	toString()
public void	undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in) Compress space undo.
public void	writeExternal(ObjectOutput out)

Field Detail

newHighestPage
protected int newHighestPage(Code)
	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.

num_pages_truncated
protected int num_pages_truncated(Code)
	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.

Constructor Detail

CompressSpacePageOperation
public CompressSpacePageOperation(AllocPage allocPage, int highest_page, int num_truncated) throws StandardException(Code)
	Constructors for This class:

CompressSpacePageOperation
public CompressSpacePageOperation()(Code)
	Public Methods of Formatable interface.

Method Detail

doMe
final public void doMe(Transaction tran, LogInstant instant, LimitObjectInput in) throws StandardException(Code)
	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. Parameters: instant - log instant for this operation. Parameters: in - unused by this log operation. exception: StandardException - Standard exception policy.

getTypeFormatId
public int getTypeFormatId()(Code)
	Return my format identifier.

readExternal
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code)
	exception: IOException - error reading from log stream exception: ClassNotFoundException - cannot read object from input

restoreMe
public void restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in)(Code)

toString
public String toString()(Code)
	debug

undoMe
public void undoMe(Transaction xact, BasePage undoPage, LogInstant CLRInstant, LimitObjectInput in) throws StandardException(Code)
	Compress space undo. exception: StandardException - Thrown by methods I call See Also: PhysicalPageOperation.undoMe

writeExternal
public void writeExternal(ObjectOutput out) throws IOException(Code)

Methods inherited from org.apache.derby.impl.store.raw.data.PhysicalPageOperation

public Compensation generateUndo(Transaction xact, LimitObjectInput in) throws StandardException(Code)(Java Doc)
abstract public void undoMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in) throws StandardException, IOException(Code)(Java Doc)

Fields inherited from org.apache.derby.impl.store.raw.data.PageBasicOperation

protected transient RawContainerHandle containerHdl(Code)(Java Doc)
protected transient boolean foundHere(Code)(Java Doc)
protected transient BasePage page(Code)(Java Doc)

Methods inherited from org.apache.derby.impl.store.raw.data.PageBasicOperation

final public BasePage findpage(Transaction xact) throws StandardException(Code)(Java Doc)
final public Page getPage()(Code)(Java Doc)
protected BasePage getPageForRedoRecovery(Transaction xact) throws StandardException(Code)(Java Doc)
final protected PageKey getPageId()(Code)(Java Doc)
final public long getPageVersion()(Code)(Java Doc)
public ByteArray getPreparedLog() throws StandardException(Code)(Java Doc)
public int group()(Code)(Java Doc)
final public boolean needsRedo(Transaction xact) throws StandardException(Code)(Java Doc)
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code)(Java Doc)
public void reclaimPrepareLocks(Transaction t, LockingPolicy locking_policy) throws StandardException(Code)(Java Doc)
public void releaseResource(Transaction xact)(Code)(Java Doc)
final protected void resetPageNumber(long pageNumber)(Code)(Java Doc)
abstract public void restoreMe(Transaction xact, BasePage undoPage, LogInstant CLRinstant, LimitObjectInput in) throws StandardException, IOException(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public void writeExternal(ObjectOutput out) throws IOException(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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