Module org.apache.jena.dboe.storage

Package org.apache.jena.dboe.storage.system

Class DatasetGraphTxnCtl

java.lang.Object

org.apache.jena.sparql.core.DatasetGraphWrapper

org.apache.jena.dboe.storage.system.DatasetGraphTxnCtl

All Implemented Interfaces:

org.apache.jena.atlas.lib.Closeable, org.apache.jena.atlas.lib.Sync, org.apache.jena.dboe.transaction.txn.TransactionalSystemControl, DatasetGraph, Transactional

public class DatasetGraphTxnCtl
extends DatasetGraphWrapper
implements org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

DatasetGraph wrapper controls entry and exit of transactions.

• Exclusive access (no transactions active)
• Read only database - No possible writers (write and promotable transactions)

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.jena.sparql.core.Transactional

Transactional.Promote

Constructor Summary

Constructors

Constructor	Description
DatasetGraphTxnCtl(DatasetGraph dsg)
DatasetGraphTxnCtl(DatasetGraph dsg, Context context)

Method Summary

Modifier and Type	Method	Description
void	abort()
void	begin(ReadWrite readWrite)
void	begin(TxnType txnType)
void	commit()
void	end()
void	finishExclusiveMode()	Return to normal (release waiting transactions, allow new transactions).
void	finishNonExclusiveMode()
void	finishReadOnlyDatabase()	Release any waiting potential writers.
void	startExclusiveMode()	Enter exclusive mode; block if necessary.
void	startNonExclusiveMode()
void	startReadOnlyDatabase()	Block until no writers or promote transactions present are present.
boolean	tryExclusiveMode()	Try to enter exclusive mode.
boolean	tryExclusiveMode(boolean canBlock)	Try to enter exclusive mode.
boolean	tryNonExclusiveMode(boolean canBlock)

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

add, add, addGraph, begin, clear, close, contains, contains, containsGraph, delete, delete, deleteAny, find, find, find, findNG, getBase, getBaseForQuery, getContext, getDefaultGraph, getGraph, getLock, getUnionGraph, getWrapped, isEmpty, isInTransaction, listGraphNodes, prefixes, promote, promote, removeGraph, setDefaultGraph, size, supportsTransactionAbort, supportsTransactions, sync, toString, transactionMode, transactionType, unwrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.sparql.core.DatasetGraph

addAll, stream, stream

Methods inherited from interface org.apache.jena.sparql.core.Transactional

calc, calculate, calculateRead, calculateWrite, exec, execute, executeRead, executeWrite

Methods inherited from interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

execExclusive, execReadOnlyDatabase, tryNonExclusiveMode

Constructor Details

DatasetGraphTxnCtl

public DatasetGraphTxnCtl(DatasetGraph dsg)

DatasetGraphTxnCtl

public DatasetGraphTxnCtl(DatasetGraph dsg,
 Context context)

Method Details

begin

public void begin(TxnType txnType)

Specified by:

begin in interface Transactional

Overrides:

begin in class DatasetGraphWrapper

begin

public void begin(ReadWrite readWrite)

Specified by:

begin in interface Transactional

Overrides:

begin in class DatasetGraphWrapper

commit

public void commit()

Specified by:

commit in interface Transactional

Overrides:

commit in class DatasetGraphWrapper

abort

public void abort()

Specified by:

abort in interface Transactional

Overrides:

abort in class DatasetGraphWrapper

end

public void end()

Specified by:

end in interface Transactional

Overrides:

end in class DatasetGraphWrapper

startReadOnlyDatabase

public void startReadOnlyDatabase()

Block until no writers or promote transactions present are present.

Specified by:

startReadOnlyDatabase in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

finishReadOnlyDatabase

public void finishReadOnlyDatabase()

Release any waiting potential writers.

Specified by:

finishReadOnlyDatabase in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

startNonExclusiveMode

public void startNonExclusiveMode()

Specified by:

startNonExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

tryNonExclusiveMode

public boolean tryNonExclusiveMode(boolean canBlock)

Specified by:

tryNonExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

finishNonExclusiveMode

public void finishNonExclusiveMode()

Specified by:

finishNonExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

startExclusiveMode

public void startExclusiveMode()

Enter exclusive mode; block if necessary. There are no active transactions on return; new transactions will be held up in 'begin'. Return to normal (release waiting transactions, allow new transactions) with finishExclusiveMode().

Do not call inside an existing transaction.

Specified by:

startExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

tryExclusiveMode

public boolean tryExclusiveMode()

Try to enter exclusive mode. If return is true, then there are no active transactions on return and new transactions will be held up in 'begin'. If false, there were in-progress transactions. Return to normal (release waiting transactions, allow new transactions) with finishExclusiveMode().

Do not call inside an existing transaction.

Specified by:

tryExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

tryExclusiveMode

public boolean tryExclusiveMode(boolean canBlock)

Try to enter exclusive mode. If return is true, then there are no active transactions on return and new transactions will be held up in 'begin'. If false, there were in-progress transactions. Return to normal (release waiting transactions, allow new transactions) with finishExclusiveMode().

Do not call inside an existing transaction.

Specified by:

tryExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl

Parameters:

canBlock - Allow the operation block and wait for the exclusive mode lock.

finishExclusiveMode

public void finishExclusiveMode()

Return to normal (release waiting transactions, allow new transactions). Must be paired with an earlier startExclusiveMode().

Specified by:

finishExclusiveMode in interface org.apache.jena.dboe.transaction.txn.TransactionalSystemControl