| java.lang.Object
 org.apache.derby.impl.store.access.btree.index.B2INoLocking
All known Subclasses: org.apache.derby.impl.store.access.btree.index.B2ITableLocking3,
| B2INoLocking | | public class B2INoLocking implements BTreeLockingPolicy(Code) | | Secondary index locking policy that does no locking.
This is used when the caller knows that logical locks are already obtained
so need not be requested again. For instance when inserting a row into
an index, a X row lock has already been obtained when the row was inserted
into the base table, so there is no need to get another lock in the
secondary index.
This class overrides all interfaces of BTreeLockingPolicy making them
no-ops.
|
| Method Summary | |
| public boolean | lockNonScanPreviousRow(BTree btree, LeafControlRow current_leaf, int current_slot, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, OpenBTree open_btree, int lock_operation, int lock_duration)
Lock the row previous to the input row. | | public boolean | lockNonScanRow(BTree btree, LeafControlRow current_leaf, LeafControlRow aux_leaf, DataValueDescriptor[] current_row, int lock_operation)
Lock the in memory row. | | public boolean | lockNonScanRowOnPage(BTree btree, LeafControlRow current_leaf, int current_slot, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, int lock_operation)
| | public boolean | lockScan(LeafControlRow current_leaf, ControlRow aux_control_row, boolean forUpdate, int lock_operation)
Lock a control row page for scan. | | public boolean | lockScanCommittedDeletedRow(OpenBTree open_btree, LeafControlRow leaf, DataValueDescriptor[] template, FetchDescriptor lock_fetch_desc, int slot_no)
Lock a btree row to determine if it is a committed deleted row. | | public boolean | lockScanForReclaimSpace(LeafControlRow current_leaf)
Lock a control row page for reclaiming deleted rows.
When reclaiming deleted rows during split need to get an exclusive
scan lock on the page, which will mean there are no other scans
positioned on the page. | | public boolean | lockScanRow(OpenBTree open_btree, BTree btree, BTreeRowPosition pos, boolean request_scan_lock, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, boolean previous_key_lock, boolean forUpdate, int lock_operation)
Lock a row as part of doing the scan.
Lock the row at the given slot (or the previous row if slot is 0).
Get the scan lock on the page if "request_scan_lock" is true.
If this routine returns true all locks were acquired while maintaining
the latch on leaf. | | public void | unlockScan(long page_number)
Unlock the lock gotten by lockScan(). | | public void | unlockScanRecordAfterRead(BTreeRowPosition pos, boolean forUpdate)
Release read lock on a row. |
| B2INoLocking | | protected B2INoLocking()(Code) | | |
| lockScanCommittedDeletedRow | | public boolean lockScanCommittedDeletedRow(OpenBTree open_btree, LeafControlRow leaf, DataValueDescriptor[] template, FetchDescriptor lock_fetch_desc, int slot_no) throws StandardException(Code) | | Lock a btree row to determine if it is a committed deleted row.
Request an exclusive lock on the row located at the given slot, NOWAIT.
Return true if the lock is granted, otherwise false.
Parameters:
open_btree - The conglomerate we are locking.
Parameters:
leaf - The leaf page with the row to lock.
Parameters:
template - A scratch area to use to read in RowLocation.
Parameters:
slot_no - The slot of row on "current_leaf"
exception:
StandardException - Standard exception policy. |
| lockScanForReclaimSpace | | public boolean lockScanForReclaimSpace(LeafControlRow current_leaf) throws StandardException(Code) | | Lock a control row page for reclaiming deleted rows.
When reclaiming deleted rows during split need to get an exclusive
scan lock on the page, which will mean there are no other scans
positioned on the page. If there are other scans positioned, just
give up on reclaiming space now.
true if lock was granted nowait, else false and not lock wasgranted.
exception:
StandardException - Standard exception policy. |
| lockScanRow | | public boolean lockScanRow(OpenBTree open_btree, BTree btree, BTreeRowPosition pos, boolean request_scan_lock, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, boolean previous_key_lock, boolean forUpdate, int lock_operation) throws StandardException(Code) | | Lock a row as part of doing the scan.
Lock the row at the given slot (or the previous row if slot is 0).
Get the scan lock on the page if "request_scan_lock" is true.
If this routine returns true all locks were acquired while maintaining
the latch on leaf. If this routine returns false, locks may or may
not have been acquired, and the routine should be called again after
the client has researched the tree to reget the latch on the
appropriate page.
(p>
As a sided effect stores the value of the record handle of the current
scan lock.
Whether locks were acquired without releasing latch on leaf.
Parameters:
pos - The position of the row to lock.
Parameters:
request_scan_lock - Whether to request the page scan lock, shouldonly be requested once per page in the scan.
exception:
StandardException - Standard exception policy. |
| unlockScan | | public void unlockScan(long page_number)(Code) | | Unlock the lock gotten by lockScan().
See BTree.unlockScan() for more info.
|
| unlockScanRecordAfterRead | | public void unlockScanRecordAfterRead(BTreeRowPosition pos, boolean forUpdate) throws StandardException(Code) | | Release read lock on a row.
Parameters:
forUpdate - Is the scan for update or for read only.
exception:
StandardException - Standard exception policy. |
|
|