com.hp.hpl.jena.shared
Class LockMRSW

java.lang.Object
  com.hp.hpl.jena.shared.LockMRSW

All Implemented Interfaces:

Lock

public class LockMRSW
extends java.lang.Object
implements Lock

Lock implemenetation using a Multiple Reader, Single Writer policy. All the locking work is done by the imported WriterPreferenceReadWriteLock. Ths class adds:

• The same thread that acquired a lock should release it
• Lock promotion (turning read locks into write locks) is deteched as an error

Version:

$Id: LockMRSW.java,v 1.2 2009/10/01 21:59:51 andy_seaborne Exp $

Author:

Andy Seaborne

Field Summary

Fields inherited from interface com.hp.hpl.jena.shared.Lock

READ, WRITE

Constructor Summary

LockMRSW()


Method Summary

void	enterCriticalSection(boolean readLockRequested) Application controlled locking - enter a critical section.
void	leaveCriticalSection() Application controlled locking - leave a critical section.

Methods inherited from class java.lang.Object

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

Constructor Detail

LockMRSW

public LockMRSW()

Method Detail

enterCriticalSection

public final void enterCriticalSection(boolean readLockRequested)

Application controlled locking - enter a critical section. Locking is reentrant so an application can have nested critical sections. Typical code:

  try {
     enterCriticalSection(Lock.READ) ;
     ... application code ...
  } finally { leaveCriticalSection() ; }
 

Specified by:

enterCriticalSection in interface Lock

Parameters:

readLockRequested - true implies a read lock,false implies write lock.

See Also:

Lock.leaveCriticalSection()

leaveCriticalSection

public final void leaveCriticalSection()

Application controlled locking - leave a critical section.

Specified by:

leaveCriticalSection in interface Lock

See Also:

enterCriticalSection(boolean)