Class ReclaimSpace
- java.lang.Object
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- org.apache.derby.impl.store.raw.data.ReclaimSpace
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- All Implemented Interfaces:
Serviceable
public final class ReclaimSpace extends java.lang.Object implements 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
Fields Modifier and Type Field Description private int
attempts
static int
COLUMN_CHAIN
private int
columnId
private long
columnPageId
private int
columnRecordId
static int
CONTAINER
private ContainerKey
containerId
private RecordHandle
headRowHandle
static int
PAGE
private PageKey
pageId
private DataFactory
processor
private int
reclaim
static int
ROW_RESERVE
private boolean
serviceASAP
private PageTimeStamp
timeStamp
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Fields inherited from interface org.apache.derby.iapi.services.daemon.Serviceable
DONE, REQUEUE
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Constructor Summary
Constructors Constructor Description ReclaimSpace(int reclaim, ContainerKey containerId, DataFactory processor, boolean serviceASAP)
ReclaimSpace(int reclaim, PageKey pageId, DataFactory processor, boolean serviceASAP)
ReclaimSpace(int reclaim, RecordHandle headRowHandle, int columnId, long ovPageId, int ovRecordId, PageTimeStamp timeStamp, DataFactory processor, boolean serviceASAP)
ReclaimSpace(int reclaim, RecordHandle headRowHandle, DataFactory processor, boolean serviceASAP)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getColumnId()
long
getColumnPageId()
int
getColumnRecordId()
ContainerKey
getContainerId()
RecordHandle
getHeadRowHandle()
PageKey
getPageId()
PageTimeStamp
getPageTimeStamp()
int
incrAttempts()
private void
initContainerInfo(ContainerKey containerId, int reclaim, DataFactory processor, boolean serviceASAP)
int
performWork(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()
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Field Detail
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serviceASAP
private boolean serviceASAP
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containerId
private ContainerKey containerId
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pageId
private PageKey pageId
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headRowHandle
private 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 PageTimeStamp timeStamp
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attempts
private int attempts
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processor
private 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
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Constructor Detail
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ReclaimSpace
public ReclaimSpace(int reclaim, ContainerKey containerId, DataFactory processor, boolean serviceASAP)
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ReclaimSpace
public ReclaimSpace(int reclaim, PageKey pageId, DataFactory processor, boolean serviceASAP)
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ReclaimSpace
public ReclaimSpace(int reclaim, RecordHandle headRowHandle, DataFactory processor, boolean serviceASAP)
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ReclaimSpace
public ReclaimSpace(int reclaim, RecordHandle headRowHandle, int columnId, long ovPageId, int ovRecordId, PageTimeStamp timeStamp, DataFactory processor, boolean serviceASAP)
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Method Detail
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initContainerInfo
private void initContainerInfo(ContainerKey containerId, int reclaim, DataFactory processor, boolean serviceASAP)
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serviceASAP
public boolean serviceASAP()
Description copied from interface: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 processingMT - MT safe
- Specified by:
serviceASAP
in interfaceServiceable
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performWork
public int performWork(ContextManager context) throws StandardException
Description copied from interface: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 interfaceServiceable
- Parameters:
context
- the contextManager set up by the DaemonService. There may or may not be the necessary context on it, depending on which other Serviceable object it has done work for.- Returns:
- the return status is only significant if the Serviceable client was enqueued instead of subscribed. For subscribed client, the return status is ignored. For enqueue client, it returns DONE or REQUEUE. If a REQUEUEd is returned, it would be desirable if this should not be serviceASAP, although no harm is done if this still maintains that this should be serviced ASAP ...
- Throws:
StandardException
- Standard Derby exception policyMT - depends on the work. Be wary of multiple DaemonService thread calling at the same time if you subscribe or enqueue multiple times.
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serviceImmediately
public boolean serviceImmediately()
Description copied from interface: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 interfaceServiceable
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getContainerId
public final ContainerKey getContainerId()
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getPageId
public final PageKey getPageId()
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getHeadRowHandle
public final 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 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()
- Overrides:
toString
in classjava.lang.Object
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