Class ContainerLocking2
- java.lang.Object
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- org.apache.derby.impl.store.raw.xact.NoLocking
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- org.apache.derby.impl.store.raw.xact.ContainerLocking2
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- All Implemented Interfaces:
LockingPolicy
public class ContainerLocking2 extends NoLocking
A locking policy that implements container level locking with isolation degree 2.- See Also:
LockingPolicy
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Field Summary
Fields Modifier and Type Field Description private LockFactory
lf
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Fields inherited from interface org.apache.derby.iapi.store.raw.LockingPolicy
MODE_CONTAINER, MODE_NONE, MODE_RECORD
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Constructor Summary
Constructors Modifier Constructor Description protected
ContainerLocking2()
protected
ContainerLocking2(LockFactory lf)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getMode()
Get the mode of this policyboolean
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
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Field Detail
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lf
private final LockFactory lf
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Constructor Detail
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ContainerLocking2
protected ContainerLocking2()
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ContainerLocking2
protected ContainerLocking2(LockFactory lf)
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Method Detail
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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 interfaceLockingPolicy
- Overrides:
lockContainer
in classNoLocking
- 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
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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 interfaceLockingPolicy
- Overrides:
unlockContainer
in classNoLocking
- Parameters:
t
- The transaction to associate the lock with.container
- Container to unlock.- See Also:
ContainerHandle
,ContainerHandle.close()
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getMode
public int getMode()
Description copied from interface:LockingPolicy
Get the mode of this policy- Specified by:
getMode
in interfaceLockingPolicy
- Overrides:
getMode
in classNoLocking
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