Module org.apache.jena.core

Package org.apache.jena.shared

Class LockMRSW

java.lang.Object

org.apache.jena.shared.LockMRSW

All Implemented Interfaces:

Lock

public class LockMRSW
extends Object
implements Lock

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

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

Field Summary

Fields inherited from interface org.apache.jena.shared.Lock

READ, WRITE

Constructor Summary

Constructors

Constructor	Description
LockMRSW()

Method Summary

Modifier and Type	Method	Description
final void	enterCriticalSection(boolean readLockRequested)	Application controlled locking - enter a critical section.
final 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 Details

LockMRSW

public LockMRSW()

Method Details

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)