org.apache.derby.impl.store.access.btree.index

Class B2IRowLocking2

java.lang.Object

org.apache.derby.impl.store.access.btree.index.B2IRowLocking3

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

org.apache.derby.impl.store.access.btree.index.B2IRowLocking2

All Implemented Interfaces:

BTreeLockingPolicy

Direct Known Subclasses:

B2IRowLocking1

class B2IRowLocking2
extends B2IRowLockingRR
implements BTreeLockingPolicy

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.

Field Summary

Fields inherited from class org.apache.derby.impl.store.access.btree.index.B2IRowLocking3

base_cc, open_btree

Constructor Summary

Constructors

Constructor and Description
B2IRowLocking2(Transaction rawtran, int lock_level, LockingPolicy locking_policy, ConglomerateController base_cc, OpenBTree open_btree) Constructors for This class:

Method Summary

Modifier and Type	Method and Description
void	unlockScanRecordAfterRead(BTreeRowPosition pos, boolean forUpdate) Release read lock on a row.

Methods inherited from class org.apache.derby.impl.store.access.btree.index.B2IRowLockingRR

lockScanRow

Methods inherited from class org.apache.derby.impl.store.access.btree.index.B2IRowLocking3

_lockScanRow, lockNonScanPreviousRow, lockNonScanRow, lockNonScanRowOnPage, lockScanCommittedDeletedRow

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.derby.impl.store.access.btree.BTreeLockingPolicy

lockNonScanPreviousRow, lockNonScanRow, lockNonScanRowOnPage, lockScanCommittedDeletedRow, lockScanRow

Constructor Detail

B2IRowLocking2

B2IRowLocking2(Transaction rawtran,
               int lock_level,
               LockingPolicy locking_policy,
               ConglomerateController base_cc,
               OpenBTree open_btree)

Constructors for This class:

Method Detail

unlockScanRecordAfterRead

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

Release read lock on a row.

Specified by:

unlockScanRecordAfterRead in interface BTreeLockingPolicy

Overrides:

unlockScanRecordAfterRead in class B2IRowLockingRR

Parameters:

forUpdate - Is the scan for update or for read only.

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

Throws:

StandardException - Standard exception policy.