B2IRowLocking2 (Apache Derby V10.14 Internals)

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.B2IRowLocking3
_lockScanRow, lockNonScanPreviousRow, lockNonScanRow, lockNonScanRowOnPage, lockScanCommittedDeletedRow

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

Methods inherited from interface org.apache.derby.impl.store.access.btree.BTreeLockingPolicy
lockNonScanPreviousRow, lockNonScanRow, lockNonScanRowOnPage, lockScanCommittedDeletedRow, lockScanRow

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 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.

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.