ContainerLocking2 (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.store.raw.xact.NoLocking
- - org.apache.derby.impl.store.raw.xact.ContainerLocking2

All Implemented Interfaces:

LockingPolicy
```
public class ContainerLocking2
extends NoLocking
```
A locking policy that implements container level locking with isolation degree 2.

See Also:

LockingPolicy

Field Summary

Fields
Modifier and Type Field Description

private LockFactory lf
- Fields inherited from interface org.apache.derby.iapi.store.raw.LockingPolicy
  MODE_CONTAINER, MODE_NONE, MODE_RECORD

Fields
Modifier and Type	Field	Description
`private LockFactory`	`lf`

Constructor Summary

Constructors
Modifier Constructor Description

protected ContainerLocking2()

protected ContainerLocking2(LockFactory lf)

Constructors
Modifier	Constructor	Description
`protected`	`ContainerLocking2()`
`protected`	`ContainerLocking2(LockFactory lf)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getMode()`	Get the mode of this policy
`boolean`	`lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate)`	Obtain a Container shared or exclusive lock until the end of the nested transaction.
`void`	`unlockContainer(Transaction t, ContainerHandle container)`	Unlock read locks.

Methods inherited from class org.apache.derby.impl.store.raw.xact.NoLocking
lockRecordForRead, lockRecordForWrite, unlockRecordAfterRead, zeroDurationLockRecordForWrite

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

- Field Detail
  - lf
```
private final LockFactory lf
```
- Constructor Detail
  - ContainerLocking2
```
protected ContainerLocking2()
```
  - ContainerLocking2
```
protected ContainerLocking2(LockFactory lf)
```
- Method Detail
  - lockContainer
```
public boolean lockContainer(Transaction t,
                             ContainerHandle container,
                             boolean waitForLock,
                             boolean forUpdate)
                      throws StandardException
```
    Obtain a Container shared or exclusive lock until the end of the nested transaction.
    
    Specified by:
    
    lockContainer in interface LockingPolicy
    
    Overrides:
    
    lockContainer in class NoLocking
    
    Parameters:
    
    t - Transaction to associate lock with.
    
    container - Container to lock.
    
    waitForLock - Should lock request wait until granted?
    
    forUpdate - Should container be locked for update, or read?
    
    Returns:
    
    true if the lock was obtained, false if it wasn't. False should only be returned if the waitForLock policy was set to "false," and the lock was unavailable.
    
    Throws:
    
    StandardException - Standard Derby error policy
    
    See Also:
    
    ContainerHandle
  - unlockContainer
```
public void unlockContainer(Transaction t,
                            ContainerHandle container)
```
    Unlock read locks.
    In Cursor stability release all read locks obtained. unlockContainer() will be called when the container is closed.
    
    Specified by:
    
    unlockContainer in interface LockingPolicy
    
    Overrides:
    
    unlockContainer in class NoLocking
    
    Parameters:
    
    t - The transaction to associate the lock with.
    
    container - Container to unlock.
    
    See Also:
    
    ContainerHandle, ContainerHandle.close()
  - getMode
```
public int getMode()
```
    Description copied from interface: LockingPolicy
    
    Get the mode of this policy
    
    Specified by:
    
    getMode in interface LockingPolicy
    
    Overrides:
    
    getMode in class NoLocking

Class ContainerLocking2

Field Summary

Fields inherited from interface org.apache.derby.iapi.store.raw.LockingPolicy

Constructor Summary

Method Summary

Methods inherited from class org.apache.derby.impl.store.raw.xact.NoLocking

Methods inherited from class java.lang.Object

Field Detail

lf

Constructor Detail

ContainerLocking2

ContainerLocking2

Method Detail

lockContainer

unlockContainer

getMode