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org.apache.derby.impl.store.raw.data
Class ReclaimSpace  

java.lang.Object
  org.apache.derby.impl.store.raw.data.ReclaimSpace

All Implemented Interfaces:

org.apache.derby.iapi.services.daemon.Serviceable

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public final class ReclaimSpace

extends java.lang.Object

implements org.apache.derby.iapi.services.daemon.Serviceable

Post commit work to reclaim some space from the raw store. This is a wrapper class for the real serviceable class who wraps this on top of itself so different things can be identified.

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Field Summary
private  int	attempts
static int	COLUMN_CHAIN
private  int	columnId
private  long	columnPageId
private  int	columnRecordId
static int	CONTAINER
private  org.apache.derby.iapi.store.raw.ContainerKey	containerId
private  org.apache.derby.iapi.store.raw.RecordHandle	headRowHandle
static int	PAGE
private  org.apache.derby.iapi.store.raw.PageKey	pageId
private  org.apache.derby.iapi.store.raw.data.DataFactory	processor
private  int	reclaim
static int	ROW_RESERVE
private  boolean	serviceASAP
private  org.apache.derby.iapi.store.raw.PageTimeStamp	timeStamp

 

Fields inherited from interface org.apache.derby.iapi.services.daemon.Serviceable

DONE, REQUEUE

 

Constructor Summary

ReclaimSpace(int reclaim, org.apache.derby.iapi.store.raw.ContainerKey containerId, org.apache.derby.iapi.store.raw.data.DataFactory processor, boolean serviceASAP)

ReclaimSpace(int reclaim, org.apache.derby.iapi.store.raw.PageKey pageId, org.apache.derby.iapi.store.raw.data.DataFactory processor, boolean serviceASAP)

ReclaimSpace(int reclaim, org.apache.derby.iapi.store.raw.RecordHandle headRowHandle, org.apache.derby.iapi.store.raw.data.DataFactory processor, boolean serviceASAP)

ReclaimSpace(int reclaim, org.apache.derby.iapi.store.raw.RecordHandle headRowHandle, int columnId, long ovPageId, int ovRecordId, org.apache.derby.iapi.store.raw.PageTimeStamp timeStamp, org.apache.derby.iapi.store.raw.data.DataFactory processor, boolean serviceASAP)

 

Method Summary
int	getColumnId()
long	getColumnPageId()
int	getColumnRecordId()
org.apache.derby.iapi.store.raw.ContainerKey	getContainerId()
org.apache.derby.iapi.store.raw.RecordHandle	getHeadRowHandle()
org.apache.derby.iapi.store.raw.PageKey	getPageId()
org.apache.derby.iapi.store.raw.PageTimeStamp	getPageTimeStamp()
int	incrAttempts()
private  void	initContainerInfo(org.apache.derby.iapi.store.raw.ContainerKey containerId, int reclaim, org.apache.derby.iapi.store.raw.data.DataFactory processor, boolean serviceASAP)
int	performWork(org.apache.derby.iapi.services.context.ContextManager context)           Do whatever it is that you want the daemon to do for you.
int	reclaimWhat()
boolean	serviceASAP()           If this work should be done as soon as possible, then return true.
boolean	serviceImmediately()           If this work should be done immediately on the user thread then return true.
java.lang.String	toString()           Convert this Object to a human-readable String.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

serviceASAP

private boolean serviceASAP

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containerId

private org.apache.derby.iapi.store.raw.ContainerKey containerId

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pageId

private org.apache.derby.iapi.store.raw.PageKey pageId

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headRowHandle

private org.apache.derby.iapi.store.raw.RecordHandle headRowHandle

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columnId

private int columnId

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columnPageId

private long columnPageId

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columnRecordId

private int columnRecordId

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timeStamp

private org.apache.derby.iapi.store.raw.PageTimeStamp timeStamp

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attempts

private int attempts

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processor

private org.apache.derby.iapi.store.raw.data.DataFactory processor

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reclaim

private int reclaim

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CONTAINER

public static final int CONTAINER

See Also:

Constant Field Values

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PAGE

public static final int PAGE

See Also:

Constant Field Values

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ROW_RESERVE

public static final int ROW_RESERVE

See Also:

Constant Field Values

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COLUMN_CHAIN

public static final int COLUMN_CHAIN

See Also:

Constant Field Values

Constructor Detail

ReclaimSpace

public ReclaimSpace(int reclaim,
                    org.apache.derby.iapi.store.raw.ContainerKey containerId,
                    org.apache.derby.iapi.store.raw.data.DataFactory processor,
                    boolean serviceASAP)

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ReclaimSpace

public ReclaimSpace(int reclaim,
                    org.apache.derby.iapi.store.raw.PageKey pageId,
                    org.apache.derby.iapi.store.raw.data.DataFactory processor,
                    boolean serviceASAP)

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ReclaimSpace

public ReclaimSpace(int reclaim,
                    org.apache.derby.iapi.store.raw.RecordHandle headRowHandle,
                    org.apache.derby.iapi.store.raw.data.DataFactory processor,
                    boolean serviceASAP)

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ReclaimSpace

public ReclaimSpace(int reclaim,
                    org.apache.derby.iapi.store.raw.RecordHandle headRowHandle,
                    int columnId,
                    long ovPageId,
                    int ovRecordId,
                    org.apache.derby.iapi.store.raw.PageTimeStamp timeStamp,
                    org.apache.derby.iapi.store.raw.data.DataFactory processor,
                    boolean serviceASAP)

Method Detail

initContainerInfo

private void initContainerInfo(org.apache.derby.iapi.store.raw.ContainerKey containerId,
                               int reclaim,
                               org.apache.derby.iapi.store.raw.data.DataFactory processor,
                               boolean serviceASAP)

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serviceASAP

public boolean serviceASAP()

Description copied from interface: org.apache.derby.iapi.services.daemon.Serviceable

If this work should be done as soon as possible, then return true. If it doesn't make any difference if it is done sooner rather than later, then return false. The difference is whether or not the daemon service will be notified to work on this when this work is enqueued or subscribed, in case the serviceable work is put together but not sent to the daemon service directly, like in post commit processing

MT - MT safe

Specified by:

serviceASAP in interface org.apache.derby.iapi.services.daemon.Serviceable

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performWork

public int performWork(org.apache.derby.iapi.services.context.ContextManager context)
                throws org.apache.derby.iapi.error.StandardException

Description copied from interface: org.apache.derby.iapi.services.daemon.Serviceable

Do whatever it is that you want the daemon to do for you. There may be multiple daemon objects on different thread calling performWork at the same time. The DaemonService will always call performWork with a context manager set up. the DaemonService will clean up the context if an exception is thrown. However, it is up to performWork to manage its own transaction. If you start a transaction in performWork, you must commit or abort it at the end. You may leave the transaction open so that other serviceable may use the transaction and context without starting a new one. On the same token, there may already be an opened transaction on the context. Serviceable performWork should always check the state of the context before use. A Serviceable object should be well behaved while it is performing the daemon work, i.e., it should not take too many resources or hog the CPU for too long or deadlock with anyone else.

Specified by:

performWork in interface org.apache.derby.iapi.services.daemon.Serviceable

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serviceImmediately

public boolean serviceImmediately()

Description copied from interface: org.apache.derby.iapi.services.daemon.Serviceable

If this work should be done immediately on the user thread then return true. If it doesn't make any difference if this work is done on a the user thread immediately or if it is performed by another thread asynchronously later, then return false.

Specified by:

serviceImmediately in interface org.apache.derby.iapi.services.daemon.Serviceable

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getContainerId

public final org.apache.derby.iapi.store.raw.ContainerKey getContainerId()

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getPageId

public final org.apache.derby.iapi.store.raw.PageKey getPageId()

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getHeadRowHandle

public final org.apache.derby.iapi.store.raw.RecordHandle getHeadRowHandle()

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getColumnId

public final int getColumnId()

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getColumnPageId

public final long getColumnPageId()

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getColumnRecordId

public final int getColumnRecordId()

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getPageTimeStamp

public final org.apache.derby.iapi.store.raw.PageTimeStamp getPageTimeStamp()

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reclaimWhat

public final int reclaimWhat()

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incrAttempts

public final int incrAttempts()

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> store >> raw >> [ data overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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