org.apache.jena.sparql.core

Class DatasetGraphWithLock

java.lang.Object

org.apache.jena.sparql.core.DatasetGraphWrapper

org.apache.jena.sparql.core.DatasetGraphTrackActive

org.apache.jena.sparql.core.DatasetGraphWithLock

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, DatasetGraph, Transactional

public class DatasetGraphWithLock
extends DatasetGraphTrackActive
implements org.apache.jena.atlas.lib.Sync

A DatasetGraph that uses the dataset lock to give weak transactional behaviour, that is the application see transaction but they are not durable. Only provides multiple-reader OR single-writer, and no write-transaction abort.

Constructor Summary

Constructors

Constructor and Description
DatasetGraphWithLock(DatasetGraph dsg)
DatasetGraphWithLock(DatasetGraph dsg, boolean abortSupported)

Method Summary

Modifier and Type	Method and Description
Context	getContext() Get the context associated with this object - may be null
boolean	isInTransaction() Say whether inside a transaction.
boolean	supportsTransactionAbort() Declare whether Transactional.abort() is supported.
boolean	supportsTransactions() Return whether abort is provided.
void	sync()
String	toString()

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphTrackActive

abort, begin, close, commit, end

Methods inherited from class org.apache.jena.sparql.core.DatasetGraphWrapper

add, add, addGraph, clear, contains, contains, containsGraph, delete, delete, deleteAny, find, find, find, findNG, getBase, getDefaultGraph, getGraph, getLock, getWrapped, isEmpty, listGraphNodes, removeGraph, setDefaultGraph, size

Methods inherited from class java.lang.Object

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

Constructor Detail

DatasetGraphWithLock

public DatasetGraphWithLock(DatasetGraph dsg)

DatasetGraphWithLock

public DatasetGraphWithLock(DatasetGraph dsg,
                            boolean abortSupported)

Method Detail

isInTransaction

public boolean isInTransaction()

Description copied from interface: Transactional

Say whether inside a transaction.

Specified by:

isInTransaction in interface Transactional

Specified by:

isInTransaction in class DatasetGraphTrackActive

supportsTransactions

public boolean supportsTransactions()

Return whether abort is provided. Just by locking, a transaction can not write-abort (the changes have been made and not recorded). Subclasses may do better and still rely on this locking class.

Specified by:

supportsTransactions in interface DatasetGraph

Overrides:

supportsTransactions in class DatasetGraphWrapper

supportsTransactionAbort

public boolean supportsTransactionAbort()

Description copied from interface: DatasetGraph

Declare whether Transactional.abort() is supported. This goes along with clearing up after exceptions inside application transaction code.

Specified by:

supportsTransactionAbort in interface DatasetGraph

Overrides:

supportsTransactionAbort in class DatasetGraphWrapper

getContext

public Context getContext()

Description copied from interface: DatasetGraph

Get the context associated with this object - may be null

Specified by:

getContext in interface DatasetGraph

Overrides:

getContext in class DatasetGraphWrapper

sync

public void sync()

Specified by:

sync in interface org.apache.jena.atlas.lib.Sync

Overrides:

sync in class DatasetGraphWrapper

toString

public String toString()

Overrides:

toString in class DatasetGraphWrapper