Class NoLocking
- java.lang.Object
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- org.apache.derby.impl.store.raw.xact.NoLocking
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- All Implemented Interfaces:
LockingPolicy
- Direct Known Subclasses:
ContainerLocking2
,ContainerLocking3
,RowLocking3
class NoLocking extends java.lang.Object implements LockingPolicy
A locking policy that implements no locking.- See Also:
LockingPolicy
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Field Summary
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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
NoLocking()
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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)
Called when a container is opened.boolean
lockRecordForRead(Transaction t, ContainerHandle container, RecordHandle record, boolean waitForLock, boolean forUpdate)
Called before a record is fetched.boolean
lockRecordForWrite(Transaction t, RecordHandle record, boolean lockForInsert, boolean waitForLock)
Called before a record is inserted, updated or deleted.void
unlockContainer(Transaction t, ContainerHandle container)
Called when a container is closed.void
unlockRecordAfterRead(Transaction t, ContainerHandle container, RecordHandle record, boolean forUpdate, boolean row_qualified)
Called after a record has been fetched.boolean
zeroDurationLockRecordForWrite(Transaction t, RecordHandle record, boolean lockForPreviousKey, boolean waitForLock)
Request a write lock which will be released immediately upon grant.
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Method Detail
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lockContainer
public boolean lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate) throws StandardException
Description copied from interface:LockingPolicy
Called when a container is opened.- Specified by:
lockContainer
in interfaceLockingPolicy
- 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)
Description copied from interface:LockingPolicy
Called when a container is closed.- Specified by:
unlockContainer
in interfaceLockingPolicy
- See Also:
ContainerHandle
,ContainerHandle.close()
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lockRecordForRead
public boolean lockRecordForRead(Transaction t, ContainerHandle container, RecordHandle record, boolean waitForLock, boolean forUpdate) throws StandardException
Description copied from interface:LockingPolicy
Called before a record is fetched.- Specified by:
lockRecordForRead
in interfaceLockingPolicy
- Parameters:
t
- Transaction to associate lock with.container
- Open Container used to get record. Will be used to row locks by the container they belong to.record
- Record to lock.waitForLock
- Should lock request wait until granted?forUpdate
- Should container be locked for update, or read?- Throws:
StandardException
- Standard Derby error policy- See Also:
Page
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zeroDurationLockRecordForWrite
public boolean zeroDurationLockRecordForWrite(Transaction t, RecordHandle record, boolean lockForPreviousKey, boolean waitForLock) throws StandardException
Description copied from interface:LockingPolicy
Request a write lock which will be released immediately upon grant.- Specified by:
zeroDurationLockRecordForWrite
in interfaceLockingPolicy
- Parameters:
t
- Transaction to associate lock with.record
- Record to lock.lockForPreviousKey
- Lock is for a previous key of a insert.waitForLock
- Should lock request wait until granted?- Returns:
- true if the lock was obtained, false if it wasn't. False should only be returned if the waitForLock argument was set to "false," and the lock was unavailable.
- Throws:
StandardException
- Standard Derby error policy- See Also:
Page
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lockRecordForWrite
public boolean lockRecordForWrite(Transaction t, RecordHandle record, boolean lockForInsert, boolean waitForLock) throws StandardException
Description copied from interface:LockingPolicy
Called before a record is inserted, updated or deleted. If zeroDuration is true then lock is released immediately after it has been granted.- Specified by:
lockRecordForWrite
in interfaceLockingPolicy
- Parameters:
t
- Transaction to associate lock with.record
- Record to lock.lockForInsert
- Lock is for an insert.waitForLock
- Should lock request wait until granted?- Returns:
- true if the lock was obtained, false if it wasn't. False should only be returned if the waitForLock argument was set to "false," and the lock was unavailable.
- Throws:
StandardException
- Standard Derby error policy- See Also:
Page
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unlockRecordAfterRead
public void unlockRecordAfterRead(Transaction t, ContainerHandle container, RecordHandle record, boolean forUpdate, boolean row_qualified) throws StandardException
Description copied from interface:LockingPolicy
Called after a record has been fetched.- Specified by:
unlockRecordAfterRead
in interfaceLockingPolicy
- Throws:
StandardException
- Standard Derby error policy- See Also:
Page
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getMode
public int getMode()
Description copied from interface:LockingPolicy
Get the mode of this policy- Specified by:
getMode
in interfaceLockingPolicy
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