Class RowLocking3Escalate
- 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.ContainerLocking3
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- org.apache.derby.impl.store.raw.xact.RowLocking3Escalate
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- All Implemented Interfaces:
LockingPolicy
public class RowLocking3Escalate extends ContainerLocking3
A locking policy that implements row level locking with isolation degree 3.- See Also:
LockingPolicy
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Field Summary
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Fields inherited from class org.apache.derby.impl.store.raw.xact.ContainerLocking3
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
RowLocking3Escalate(LockFactory lf)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate)
Escalates Row Locking 3 to Container Locking 3.-
Methods inherited from class org.apache.derby.impl.store.raw.xact.ContainerLocking3
getMode
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Methods inherited from class org.apache.derby.impl.store.raw.xact.NoLocking
lockRecordForRead, lockRecordForWrite, unlockContainer, unlockRecordAfterRead, zeroDurationLockRecordForWrite
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Constructor Detail
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RowLocking3Escalate
protected RowLocking3Escalate(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
Escalates Row Locking 3 to Container Locking 3.This call is made by code which tracks the number of locks on a container. When the number of locks exceeds the escalate threshold the caller creates this new locking policy, calls lockContainer(), and substitues it for the old locking policy. The lockContainer call determines which table lock to get (S or X), gets that table lock, and then releases the row locks on the table. It is assumed that this is called on a open container for lock only.
- Specified by:
lockContainer
in interfaceLockingPolicy
- Overrides:
lockContainer
in classContainerLocking3
- Parameters:
t
- Transaction to associate lock with.container
- Container to lock.waitForLock
- Ignored - will never wait for a lock.forUpdate
- Ignored, mode determined from current lock state.- 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 exception policy.- See Also:
ContainerHandle
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