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The TransactionManager interface provides methods on the transaction needed by an access method implementer, but should not be visible to clients of a TransactionController.
TransactionController
Field Summary | |
static int |
LOCK_COMMIT_DURATION
hold lock until end of transaction. |
static int |
LOCK_INSTANT_DURATION
release lock immediately after getting lock. |
static int |
LOCK_MANUAL_DURATION
Allow lock to be released manually prior to end transaction. |
static int |
MODE_NONE
Constant used for the lock_level argument to openConglomerate() and openScan() calls. |
Method Summary | |
void |
addPostCommitWork(Serviceable work)
Add to the list of post commit work. |
void |
closeMe(ConglomerateController conglom_control)
The ConglomerateController.close() method has been called on "conglom_control". |
void |
closeMe(ScanManager scan)
The ScanManager.close() method has been called on "scan". |
void |
closeMe(SortController sort_control)
The SortController.close() method has been called on "sort_control". |
AccessFactory |
getAccessManager()
Get reference to access factory which started this transaction. |
TransactionManager |
getInternalTransaction()
Get an Internal transaction. |
Transaction |
getRawStoreXact()
Get the Transaction from the Transaction manager. |
void |
saveScanPositions(Conglomerate conglom,
Page page)
Do work necessary to maintain the current position in all the scans. |
Methods inherited from interface org.apache.derby.iapi.services.property.PersistentSet |
getProperties, getProperty, getPropertyDefault, propertyDefaultIsVisible, setProperty, setPropertyDefault |
Field Detail |
public static final int MODE_NONE
public static final int LOCK_INSTANT_DURATION
public static final int LOCK_COMMIT_DURATION
public static final int LOCK_MANUAL_DURATION
Method Detail |
public void addPostCommitWork(Serviceable work)
Add to the list of post commit work that may be processed after this transaction commits. If this transaction aborts, then the post commit work list will be thrown away. No post commit work will be taken out on a rollback to save point.
This routine simply delegates the work to the Rawstore transaction.
work
- The post commit work to do.public void closeMe(ScanManager scan)
Take whatever cleanup action is appropriate to a closed scan. It is likely this routine will remove references to the scan object that it was maintaining for cleanup purposes.
public void closeMe(ConglomerateController conglom_control)
Take whatever cleanup action is appropriate to a closed conglomerateController. It is likely this routine will remove references to the ConglomerateController object that it was maintaining for cleanup purposes.
public void closeMe(SortController sort_control)
Take whatever cleanup action is appropriate to a closed sortController. It is likely this routine will remove references to the SortController object that it was maintaining for cleanup purposes.
public AccessFactory getAccessManager()
public TransactionManager getInternalTransaction() throws StandardException
Start an internal transaction. An internal transaction is a completely separate transaction from the current user transaction. All work done in the internal transaction must be physical (ie. it can be undone physically by the rawstore at the page level, rather than logically undone like btree insert/delete operations). The rawstore guarantee's that in the case of a system failure all open Internal transactions are first undone in reverse order, and then other transactions are undone in reverse order.
Internal transactions are meant to implement operations which, if interupted before completion will cause logical operations like tree searches to fail. This special undo order insures that the state of the tree is restored to a consistent state before any logical undo operation which may need to search the tree is performed.
StandardException
- Standard exception policy.public Transaction getRawStoreXact() throws StandardException
Access methods often need direct access to the "Transaction" - ie. the raw store transaction, so give access to it.
StandardException
- Standard exception policy.public void saveScanPositions(Conglomerate conglom, Page page) throws StandardException
The latched page in the conglomerate "congomid" is changing, do whatever is necessary to maintain the current position of all the scans open in this transaction.
For some conglomerates this may be a no-op.
conglom
- Conglomerate object of the conglomerate being changed.page
- Page in the conglomerate being changed.
StandardException
- Standard exception policy.
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Built on Mon 2007-06-04 09:58:47+0400, from revision ??? | |||||||||
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