| java.lang.Object
 org.apache.derby.impl.store.raw.xact.NoLocking
org.apache.derby.impl.store.raw.xact.RowLocking3
org.apache.derby.impl.store.raw.xact.RowLockingRR
org.apache.derby.impl.store.raw.xact.RowLocking2
All known Subclasses: org.apache.derby.impl.store.raw.xact.RowLocking1, org.apache.derby.impl.store.raw.xact.RowLocking2nohold,
| RowLocking2 | | public class RowLocking2 extends RowLockingRR (Code) | | A locking policy that implements row level locking with isolation degree 2.
The approach is to place all "write" container and row locks on the
transaction group lock list. Locks on this group will last until end
of transaction. All "read" container and row locks will be placed
on a group list, key'd by the ContainerId of the lock. Locks on this
list will either be released explicitly by the caller, or will be released
as a group when the unlockContainer() call is made.
Note that write operations extend from the RowLocking3 implementations.
See Also: org.apache.derby.iapi.store.raw.LockingPolicy |
| Method Summary | |
| public boolean | lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate)
Obtain container level intent lock.
This implementation of row locking is 2 level, ie. | | public boolean | lockRecordForRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean waitForLock, boolean forUpdate)
Obtain lock on record being read.
Assumes that a table level IS has been acquired. | | public void | lockRecordForRead(Latch latch, RecordHandle record, boolean forUpdate)
Obtain lock on record being read while holding a latch.
Assumes that a table level IS has been acquired. | | public void | unlockContainer(Transaction t, ContainerHandle container_handle)
Unlock read locks.
In Cursor stability release all read locks obtained. | | public void | unlockRecordAfterRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean forUpdate, boolean row_qualified)
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| lockContainer | | public boolean lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate) throws StandardException(Code) | | Obtain container level intent lock.
This implementation of row locking is 2 level, ie. table and row locking.
It will interact correctly with tables opened with ContainerLocking3
locking mode.
Updater's will get table level IX locks, and X row locks.
Reader's will get table level IS locks, and S row locks.
Read locks are put in a separate "group" from the transaction, so that
when the container is closed it can release these read locks.
Parameters:
t - Transaction to associate lock with.
Parameters:
container - Container to lock.
Parameters:
waitForLock - Should lock request wait until granted?
Parameters:
forUpdate - Should container be locked for update, or read? 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.
exception:
StandardException - Standard exception policy. |
| lockRecordForRead | | public boolean lockRecordForRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean waitForLock, boolean forUpdate) throws StandardException(Code) | | Obtain lock on record being read.
Assumes that a table level IS has been acquired. Will acquire a Shared
or Update lock on the row, depending on the "forUpdate" parameter.
Read lock will be placed on separate group from transaction.
Parameters:
t - The transaction to associate the lock with.
Parameters:
record - The record to be locked.
Parameters:
waitForLock - Should lock request wait until granted?
Parameters:
forUpdate - Whether to open for read or write access. true if the lock was granted, false if waitForLock was false and the lock could not be granted.
exception:
StandardException - Standard exception policy. |
| lockRecordForRead | | public void lockRecordForRead(Latch latch, RecordHandle record, boolean forUpdate) throws StandardException(Code) | | Obtain lock on record being read while holding a latch.
Assumes that a table level IS has been acquired. Will acquire a Shared
or Update lock on the row, depending on the "forUpdate" parameter.
Parameters:
latch - The latch being held.
Parameters:
record - The record to be locked.
Parameters:
forUpdate - Whether to open for read or write access.
exception:
StandardException - Standard exception policy. |
| unlockContainer | | public void unlockContainer(Transaction t, ContainerHandle container_handle)(Code) | | Unlock read locks.
In Cursor stability release all read locks obtained. unlockContainer()
will be called when the container is closed.
Parameters:
t - The transaction to associate the lock with.
Parameters:
container_handle - Container to unlock. |
| Methods inherited from org.apache.derby.impl.store.raw.xact.RowLocking3 | public int getMode()(Code)(Java Doc)
protected RowLock getReadLockType()(Code)(Java Doc)
protected RowLock getUpdateLockType()(Code)(Java Doc)
protected RowLock getWriteLockType()(Code)(Java Doc)
public boolean lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate) throws StandardException(Code)(Java Doc)
public boolean lockRecordForRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean waitForLock, boolean forUpdate) throws StandardException(Code)(Java Doc)
public void lockRecordForRead(Latch latch, RecordHandle record, boolean forUpdate) throws StandardException(Code)(Java Doc)
public boolean lockRecordForWrite(Transaction t, RecordHandle record, boolean lockForInsert, boolean waitForLock) throws StandardException(Code)(Java Doc)
public void lockRecordForWrite(Latch latch, RecordHandle record) throws StandardException(Code)(Java Doc)
public boolean zeroDurationLockRecordForWrite(Transaction t, RecordHandle record, boolean lockForInsertPreviousKey, boolean waitForLock) throws StandardException(Code)(Java Doc)
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| Methods inherited from org.apache.derby.impl.store.raw.xact.NoLocking | public int getMode()(Code)(Java Doc)
public boolean lockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate) throws StandardException(Code)(Java Doc)
public boolean lockRecordForRead(Transaction t, ContainerHandle container, RecordHandle record, boolean waitForLock, boolean forUpdate) throws StandardException(Code)(Java Doc)
public void lockRecordForRead(Latch latch, RecordHandle record, boolean forUpdate) throws StandardException(Code)(Java Doc)
public boolean lockRecordForWrite(Transaction t, RecordHandle record, boolean lockForInsert, boolean waitForLock) throws StandardException(Code)(Java Doc)
public void lockRecordForWrite(Latch latch, RecordHandle record) throws StandardException(Code)(Java Doc)
public void unlockContainer(Transaction t, ContainerHandle container)(Code)(Java Doc)
public void unlockRecordAfterRead(Transaction t, ContainerHandle container, RecordHandle record, boolean forUpdate, boolean row_qualified) throws StandardException(Code)(Java Doc)
public boolean zeroDurationLockRecordForWrite(Transaction t, RecordHandle record, boolean lockForPreviousKey, boolean waitForLock) throws StandardException(Code)(Java Doc)
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