public class B2INoLocking extends java.lang.Object implements BTreeLockingPolicy
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.
Modifier | Constructor and Description |
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protected |
B2INoLocking() |
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B2INoLocking(Transaction rawtran,
int lock_level,
LockingPolicy locking_policy,
ConglomerateController base_cc,
OpenBTree open_btree)
Constructors for This class:
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Modifier and Type | Method and Description |
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boolean |
lockNonScanPreviousRow(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.
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boolean |
lockNonScanRow(BTree btree,
LeafControlRow current_leaf,
LeafControlRow aux_leaf,
DataValueDescriptor[] current_row,
int lock_operation)
Lock the in memory row.
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boolean |
lockNonScanRowOnPage(LeafControlRow current_leaf,
int current_slot,
FetchDescriptor lock_fetch_desc,
DataValueDescriptor[] lock_template,
RowLocation lock_row_loc,
int lock_operation)
Lock the row at the given slot.
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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.
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boolean |
lockScanRow(OpenBTree open_btree,
BTreeRowPosition pos,
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.
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void |
unlockScanRecordAfterRead(BTreeRowPosition pos,
boolean forUpdate)
Release read lock on a row.
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public B2INoLocking(Transaction rawtran, int lock_level, LockingPolicy locking_policy, ConglomerateController base_cc, OpenBTree open_btree)
protected B2INoLocking()
public boolean lockScanCommittedDeletedRow(OpenBTree open_btree, LeafControlRow leaf, DataValueDescriptor[] template, FetchDescriptor lock_fetch_desc, int slot_no) throws StandardException
Request an exclusive lock on the row located at the given slot, NOWAIT. Return true if the lock is granted, otherwise false.
lockScanCommittedDeletedRow
in interface BTreeLockingPolicy
open_btree
- The conglomerate we are locking.leaf
- The leaf page with the row to lock.template
- A scratch area to use to read in RowLocation.slot_no
- The slot of row on "current_leaf"StandardException
- Standard exception policy.public boolean lockScanRow(OpenBTree open_btree, BTreeRowPosition pos, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, boolean previous_key_lock, boolean forUpdate, int lock_operation) throws StandardException
Lock the row at the given slot (or the previous row if slot is 0).
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.
lockScanRow
in interface BTreeLockingPolicy
pos
- The position of the row to lock.open_btree
- The open_btree to associate latches with -
used if routine has to scan backward.lock_template
- A scratch area to use to read in rows.previous_key_lock
- Is this a previous key lock call?forUpdate
- Is the scan for update or for read only.lock_operation
- For what operation are we requesting the lock,
this should be one of the following 4 options:
LOCK_READ [read lock],
(LOCK_INS | LOCK_UPD) [ lock for insert],
(LOCK_INSERT_PREVKEY | LOCK_UPD) [lock for
previous key to insert],
(LOCK_UPD) [lock for delete or replace]StandardException
- Standard exception policy.public void unlockScanRecordAfterRead(BTreeRowPosition pos, boolean forUpdate) throws StandardException
unlockScanRecordAfterRead
in interface BTreeLockingPolicy
forUpdate
- Is the scan for update or for read only.pos
- Data structure that defines the current position
in the scan to be unlocked.StandardException
- Standard exception policy.public boolean lockNonScanPreviousRow(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) throws StandardException
See BTree.lockPreviousRow() for more info.
lockNonScanPreviousRow
in interface BTreeLockingPolicy
current_leaf
- Latched current leaf where "current" key is.current_slot
- The slot of row on "current_leaf"lock_template
- Empty full template row, to read row into.open_btree
- The open_btree to associate latches with -
used if routine has to scan backward.lock_operation
- For what operation are we requesting the lock,
this should be one of the following 4 options:
LOCK_READ [read lock],
(LOCK_INS | LOCK_UPD) [ lock for insert],
(LOCK_INSERT_PREVKEY | LOCK_UPD) [lock for
previous key to insert],
(LOCK_UPD) [lock for delete or replace]lock_duration
- For what duration should the lock be held,
if INSTANT_DURATION, then the routine will
guarantee that lock was acquired while holding
the latch, but then immediately release the
lock. If COMMIT_DURATION or MANUAL_DURATION
then the lock be held when routine returns
successfully.StandardException
- Standard exception policy.public boolean lockNonScanRow(BTree btree, LeafControlRow current_leaf, LeafControlRow aux_leaf, DataValueDescriptor[] current_row, int lock_operation) throws StandardException
See BTree.lockRow() for more info.
lockNonScanRow
in interface BTreeLockingPolicy
btree
- The conglomerate we are locking.current_leaf
- If non-null, this leaf is unlatched if the
routine has to wait on the lock.aux_leaf
- If non-null, this leaf is unlatched if the
routine has to wait on the lock.current_row
- In memory, objectified "current" row.lock_operation
- For what operation are we requesting the lock,
this should be one of the following 4 options:
LOCK_READ [read lock],
(LOCK_INS | LOCK_UPD) [ lock for insert],
(LOCK_INSERT_PREVKEY | LOCK_UPD) [lock for
previous key to insert],
(LOCK_UPD) [lock for delete or replace]StandardException
- Standard exception policy.public boolean lockNonScanRowOnPage(LeafControlRow current_leaf, int current_slot, FetchDescriptor lock_fetch_desc, DataValueDescriptor[] lock_template, RowLocation lock_row_loc, int lock_operation) throws StandardException
BTreeLockingPolicy
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.
lockNonScanRowOnPage
in interface BTreeLockingPolicy
current_leaf
- The control row of the current leaf to lock.current_slot
- The slot position of the row to lock.lock_template
- A scratch area to use to read in rows.lock_operation
- For what operation are we requesting the lock,
this should be one of the following 4 options:
LOCK_READ [read lock],
(LOCK_INS | LOCK_UPD) [ lock for insert],
(LOCK_INSERT_PREVKEY | LOCK_UPD) [lock for
previous key to insert],
(LOCK_UPD) [lock for delete or replace]StandardException
- Standard exception policy.Apache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.