org.apache.derby.impl.store.raw.data
Class ReclaimSpace
java.lang.Object
org.apache.derby.impl.store.raw.data.ReclaimSpace
- 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.
Constructor Summary |
ReclaimSpace(int reclaim,
ContainerKey containerId,
DataFactory processor,
boolean serviceASAP)
|
ReclaimSpace(int reclaim,
PageKey pageId,
DataFactory processor,
boolean serviceASAP)
|
ReclaimSpace(int reclaim,
RecordHandle headRowHandle,
DataFactory processor,
boolean serviceASAP)
|
ReclaimSpace(int reclaim,
RecordHandle headRowHandle,
int columnId,
long ovPageId,
int ovRecordId,
PageTimeStamp timeStamp,
DataFactory processor,
boolean serviceASAP)
|
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
serviceASAP
private boolean serviceASAP
containerId
private ContainerKey containerId
pageId
private PageKey pageId
headRowHandle
private RecordHandle headRowHandle
columnId
private int columnId
columnPageId
private long columnPageId
columnRecordId
private int columnRecordId
timeStamp
private PageTimeStamp timeStamp
attempts
private int attempts
processor
private DataFactory processor
reclaim
private int reclaim
CONTAINER
public static final int CONTAINER
- See Also:
- Constant Field Values
PAGE
public static final int PAGE
- See Also:
- Constant Field Values
ROW_RESERVE
public static final int ROW_RESERVE
- See Also:
- Constant Field Values
COLUMN_CHAIN
public static final int COLUMN_CHAIN
- See Also:
- Constant Field Values
ReclaimSpace
public ReclaimSpace(int reclaim,
ContainerKey containerId,
DataFactory processor,
boolean serviceASAP)
ReclaimSpace
public ReclaimSpace(int reclaim,
PageKey pageId,
DataFactory processor,
boolean serviceASAP)
ReclaimSpace
public ReclaimSpace(int reclaim,
RecordHandle headRowHandle,
DataFactory processor,
boolean serviceASAP)
ReclaimSpace
public ReclaimSpace(int reclaim,
RecordHandle headRowHandle,
int columnId,
long ovPageId,
int ovRecordId,
PageTimeStamp timeStamp,
DataFactory processor,
boolean serviceASAP)
initContainerInfo
private void initContainerInfo(ContainerKey containerId,
int reclaim,
DataFactory processor,
boolean serviceASAP)
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 processing
MT - MT safe
- Specified by:
serviceASAP
in interface Serviceable
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 interface Serviceable
- 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 policy
MT - depends on the work. Be wary of multiple DaemonService thread
calling at the same time if you subscribe or enqueue multiple times.
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 interface Serviceable
getContainerId
public final ContainerKey getContainerId()
getPageId
public final PageKey getPageId()
getHeadRowHandle
public final RecordHandle getHeadRowHandle()
getColumnId
public final int getColumnId()
getColumnPageId
public final long getColumnPageId()
getColumnRecordId
public final int getColumnRecordId()
getPageTimeStamp
public final PageTimeStamp getPageTimeStamp()
reclaimWhat
public final int reclaimWhat()
incrAttempts
public final int incrAttempts()
toString
public java.lang.String toString()
- Overrides:
toString
in class java.lang.Object
Apache Derby V10.6 Internals - Copyright © 2004,2007 The Apache Software Foundation. All Rights Reserved.