ojb.server.lockstrategy
Class RWRepeatableReadStrategy

java.lang.Object
  |
  +--ojb.server.lockstrategy.RWRepeatableReadStrategy

All Implemented Interfaces:

ReaderWriterLock

public class RWRepeatableReadStrategy

extends java.lang.Object

implements ReaderWriterLock

Class declaration

Version:

%I%, %G%

Author:

Fields inherited from interface ojb.server.lockstrategy.ReaderWriterLock

RW_READ_COMMITTED, RW_READ_UNCOMMITTED, RW_REPEATABLE_READ, RW_SERIALIZABLE

Constructor Summary

RWRepeatableReadStrategy()
Constructor declaration

Method Summary

boolean	checkRead(Transaction tx) checkRead -- Identify if Read access is granted.
boolean	checkWrite(Transaction tx) checkWrite -- Determine if Write access is granted.
java.lang.String	getLockType(Transaction t) getLockType - Returns an "R" if it is a Read lock, "W" if it is a Write lock, or "0" (zero) if it isn't locked.
int	getStrategy() getStrategy -- Return ReaderWriterLock.RW_REPEATABLE_READ
boolean	read(Transaction r) read -- Acquire a Read lock for the given Transaction.
boolean	release(Transaction t) release -- Release the hold on the object.
boolean	upgrade(Transaction u) upgrade -- Try to upgrade the lock to Write.
boolean	write(Transaction w) write -- Acquire a Write lock for the given transaction.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RWRepeatableReadStrategy

public RWRepeatableReadStrategy()

Constructor declaration

See Also:

Method Detail

read

public boolean read(Transaction r)

read -- Acquire a Read lock for the given Transaction.

Specified by:

read in interface ReaderWriterLock

Parameters:

r - - Transaction acquiring the lock.

Returns:

Whether lock was granted or not.

write

public boolean write(Transaction w)

write -- Acquire a Write lock for the given transaction.

Specified by:

write in interface ReaderWriterLock

Parameters:

w - - Transaction acquiring the lock.

Returns:

wether the lock was granted or not.

upgrade

public boolean upgrade(Transaction u)

upgrade -- Try to upgrade the lock to Write.

Specified by:

upgrade in interface ReaderWriterLock

Parameters:

u - - Transaction trying to upgrade.

Returns:

Whether the upgrade was successful.

release

public boolean release(Transaction t)

release -- Release the hold on the object.

Specified by:

release in interface ReaderWriterLock

Parameters:

t - Transaction to release lock.

getLockType

public java.lang.String getLockType(Transaction t)

getLockType - Returns an "R" if it is a Read lock, "W" if it is a Write lock, or "0" (zero) if it isn't locked.

Specified by:

getLockType in interface ReaderWriterLock

Following copied from interface: ojb.server.lockstrategy.ReaderWriterLock

Parameters:

tx -

Returns:

See Also:

getStrategy

public int getStrategy()

getStrategy -- Return ReaderWriterLock.RW_REPEATABLE_READ

Specified by:

getStrategy in interface ReaderWriterLock

Following copied from interface: ojb.server.lockstrategy.ReaderWriterLock

Returns:

See Also:

checkRead

public boolean checkRead(Transaction tx)

checkRead -- Identify if Read access is granted.

Specified by:

checkRead in interface ReaderWriterLock

Following copied from interface: ojb.server.lockstrategy.ReaderWriterLock

Parameters:

tx -

Returns:

See Also:

checkWrite

public boolean checkWrite(Transaction tx)

checkWrite -- Determine if Write access is granted.

Specified by:

checkWrite in interface ReaderWriterLock

Following copied from interface: ojb.server.lockstrategy.ReaderWriterLock

Parameters:

tx -

Returns:

See Also: