org.apache.derby.impl.store.raw.xact
Class ContainerLocking3

java.lang.Object
  org.apache.derby.impl.store.raw.xact.NoLocking
      org.apache.derby.impl.store.raw.xact.ContainerLocking3

All Implemented Interfaces:

LockingPolicy

Direct Known Subclasses:

RowLocking3Escalate

public class ContainerLocking3
extends NoLocking

A locking policy that implements container level locking with isolation degree 3.

See Also:

LockingPolicy

Field Summary

protected LockFactory

lf

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

MODE_CONTAINER, MODE_NONE, MODE_RECORD

Constructor Summary

protected

ContainerLocking3(LockFactory lf)

Method Summary

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.

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

lockRecordForRead, lockRecordForWrite, unlockContainer, unlockRecordAfterRead, zeroDurationLockRecordForWrite

Methods inherited from class java.lang.Object

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

Field Detail

lf

protected final LockFactory lf

Constructor Detail

ContainerLocking3

protected ContainerLocking3(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

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