Package org.apache.jackrabbit.core.state

Class DefaultISMLocking

java.lang.Object

org.apache.jackrabbit.core.state.DefaultISMLocking

All Implemented Interfaces:

ISMLocking

public class DefaultISMLocking
extends Object
implements ISMLocking

Default item state locking strategy. The default strategy is simply to use a single coarse-grained read-write lock over the entire workspace.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.jackrabbit.core.state.ISMLocking

ISMLocking.ReadLock, ISMLocking.WriteLock

Constructor Summary

Constructors

Constructor	Description
DefaultISMLocking()

Method Summary

Modifier and Type	Method	Description
ISMLocking.ReadLock	acquireReadLock(ItemId id)	Increments the reader count and returns the acquired read lock once there are no more writers or the current writer shares the thread id with this reader.
ISMLocking.WriteLock	acquireWriteLock(ChangeLog changeLog)	Increments the writer count, sets the writer identifier and returns the acquired write lock once there are no other active readers or writers or the current writer shares the thread id with this writer.
boolean	isWriterPreference()	Returns the writer preference status of this locking strategy.
void	setWriterPreference(boolean preference)	Sets the writer preference status of this locking strategy.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultISMLocking

public DefaultISMLocking()

Method Detail

isWriterPreference

public boolean isWriterPreference()

Returns the writer preference status of this locking strategy.

Returns:

writer preference

setWriterPreference

public void setWriterPreference(boolean preference)

Sets the writer preference status of this locking strategy.

Parameters:

preference - writer preference

acquireReadLock

public ISMLocking.ReadLock acquireReadLock(ItemId id)
                                    throws InterruptedException

Increments the reader count and returns the acquired read lock once there are no more writers or the current writer shares the thread id with this reader.

Specified by:

acquireReadLock in interface ISMLocking

Parameters:

id - an item id.

Throws:

InterruptedException

acquireWriteLock

public ISMLocking.WriteLock acquireWriteLock(ChangeLog changeLog)
                                      throws InterruptedException

Increments the writer count, sets the writer identifier and returns the acquired write lock once there are no other active readers or writers or the current writer shares the thread id with this writer.

Specified by:

acquireWriteLock in interface ISMLocking

Parameters:

changeLog - the change log

Returns:

the write lock for the given changeLog.

Throws:

InterruptedException - if the thread is interrupted while creating the write lock.