org.jboss.cache.lock
Class LockStrategyRepeatableRead

java.lang.Object
  org.jboss.cache.lock.LockStrategyRepeatableRead

All Implemented Interfaces:

LockStrategy

public class LockStrategyRepeatableRead
extends Object
implements LockStrategy

Transaction isolation level of Repeatable_Read. It prevents dirty read and non-repeatable read.

Dirty read allows (t1) write and then (t2) read within two separate threads, all without transaction commit.

Non-repeatable allows read allows (t1) read, (t2) write, and then (t1) read, all without transaction commit.

Version:

$Revision: 7168 $

Author:

Ben Wang

Constructor Summary

LockStrategyRepeatableRead()

Method Summary

Lock	readLock() Return a read lock object.
String	toString()
Lock	upgradeLockAttempt(long msecs) Attempt to upgrade the current read lock to write lock with msecs timeout.
Lock	writeLock() Return a write lock object.

Methods inherited from class java.lang.Object

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

Constructor Detail

LockStrategyRepeatableRead

public LockStrategyRepeatableRead()

Method Detail

readLock

public Lock readLock()

Description copied from interface: LockStrategy

Return a read lock object.

Specified by:

readLock in interface LockStrategy

See Also:

LockStrategy.readLock()

upgradeLockAttempt

public Lock upgradeLockAttempt(long msecs)
                        throws UpgradeException

Description copied from interface: LockStrategy

Attempt to upgrade the current read lock to write lock with msecs timeout.

Specified by:

upgradeLockAttempt in interface LockStrategy

Parameters:

msecs - Timeout in milliseconds.

Returns:

Lock object. Will return null if timeout or failed.

Throws:

UpgradeException

See Also:

LockStrategy.upgradeLockAttempt(long)

writeLock

public Lock writeLock()

Description copied from interface: LockStrategy

Return a write lock object.

Specified by:

writeLock in interface LockStrategy

See Also:

LockStrategy.writeLock()

toString

public String toString()

Overrides:

toString in class Object