Java Doc for RowLocking2.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » raw » xact » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.raw.xact 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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



Constructor Summary
protected  RowLocking2(LockFactory lf)
    

Method Summary
public  booleanlockContainer(Transaction t, ContainerHandle container, boolean waitForLock, boolean forUpdate)
     Obtain container level intent lock.

This implementation of row locking is 2 level, ie.

public  booleanlockRecordForRead(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  voidlockRecordForRead(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  voidunlockContainer(Transaction t, ContainerHandle container_handle)
     Unlock read locks.

In Cursor stability release all read locks obtained.

public  voidunlockRecordAfterRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean forUpdate, boolean row_qualified)
    


Constructor Detail
RowLocking2
protected RowLocking2(LockFactory lf)(Code)




Method Detail
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.




unlockRecordAfterRead
public void unlockRecordAfterRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean forUpdate, boolean row_qualified) throws StandardException(Code)



Methods inherited from org.apache.derby.impl.store.raw.xact.RowLockingRR
protected RowLock getReadLockType()(Code)(Java Doc)
protected RowLock getUpdateLockType()(Code)(Java Doc)
protected RowLock getWriteLockType()(Code)(Java Doc)
public void unlockRecordAfterRead(Transaction t, ContainerHandle container_handle, RecordHandle record, boolean forUpdate, boolean row_qualified) throws StandardException(Code)(Java Doc)

Fields inherited from org.apache.derby.impl.store.raw.xact.RowLocking3
final protected LockFactory lf(Code)(Java Doc)

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)

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)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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