Top Description Constructors Methods
org.apache.derby.impl.store.access.btree.index

pack-priv Class B2IRowLocking2

extends B2IRowLockingRR
implements BTreeLockingPolicy
Class Inheritance
All Implemented Interfaces
org.apache.derby.impl.store.access.btree.BTreeLockingPolicy
Known Direct Subclasses
org.apache.derby.impl.store.access.btree.index.B2IRowLocking1
Imports
org.apache.derby.shared.common.sanity.SanityManager, org.apache.derby.shared.common.error.StandardException, org.apache.derby.iapi.store.access.ConglomerateController, org.apache.derby.iapi.store.raw.LockingPolicy, .Transaction, org.apache.derby.impl.store.access.btree.BTreeLockingPolicy, .BTreeRowPosition, .OpenBTree
The btree locking policy which implements read committed isolation level. It inherits all functionality from B2IRowLockingRR (repeatable read) except that it releases read locks after obtaining them. It provides a single implementation of unlockScanRecordAfterRead() which releases a read lock after it has been locked and processed.

Constructor Summary

AccessConstructor and Description
pack-priv
B2IRowLocking2(Transaction rawtran, int lock_level, LockingPolicy locking_policy, ConglomerateController base_cc, OpenBTree open_btree)

Constructors for This class:

Method Summary

Modifier and TypeMethod and Description
public void
unlockScanRecordAfterRead(BTreeRowPosition
Data structure that defines the current position in the scan to be unlocked.
pos, boolean
Is the scan for update or for read only.
forUpdate)

Overrides org.apache.derby.impl.store.access.btree.index.B2IRowLockingRR.unlockScanRecordAfterRead.

Implements org.apache.derby.impl.store.access.btree.BTreeLockingPolicy.unlockScanRecordAfterRead.

Release read lock on a row.

Inherited from org.apache.derby.impl.store.access.btree.index.B2IRowLockingRR:
lockScanRow

Constructor Detail

B2IRowLocking2back to summary
pack-priv B2IRowLocking2(Transaction rawtran, int lock_level, LockingPolicy locking_policy, ConglomerateController base_cc, OpenBTree open_btree)

Constructors for This class:

Method Detail

unlockScanRecordAfterReadback to summary
public void unlockScanRecordAfterRead(BTreeRowPosition pos, boolean forUpdate) throws StandardException

Overrides org.apache.derby.impl.store.access.btree.index.B2IRowLockingRR.unlockScanRecordAfterRead.

Implements org.apache.derby.impl.store.access.btree.BTreeLockingPolicy.unlockScanRecordAfterRead.

Release read lock on a row.

Parameters
pos:BTreeRowPosition

Doc from org.apache.derby.impl.store.access.btree.BTreeLockingPolicy.unlockScanRecordAfterRead.

Data structure that defines the current position in the scan to be unlocked.

forUpdate:boolean

Is the scan for update or for read only.

Exceptions
StandardException:

Doc from org.apache.derby.impl.store.access.btree.BTreeLockingPolicy.unlockScanRecordAfterRead.

Standard exception policy.