org.apache.jena.graph

Interface TransactionHandler

All Known Implementing Classes:

BaseInfGraph.InfTransactionHandler, SimpleTransactionHandler, TransactionHandlerBase

public interface TransactionHandler

Preliminary interface for graphs supporting transactions.

Method Summary

Modifier and Type	Method and Description
void	abort() If transactions are supported and there is a transaction in progress, abort it.
void	begin() If transactions are supported, begin a new transaction.
<T> T	calculate(Supplier<T> action) Execute the supplier action within a transaction.
void	commit() If transactions are supported and there is a transaction in progress, commit it.
void	execute(Runnable action) Execute the runnable action within a transaction.
Object	executeInTransaction(Command c) Deprecated. use execute(Runnable) or calculate(Supplier)
boolean	transactionsSupported() Does this handler support transactions at all?

Method Detail

transactionsSupported

boolean transactionsSupported()

Does this handler support transactions at all?

Returns:

true iff begin/abort/commit are implemented and make sense.

begin

void begin()

If transactions are supported, begin a new transaction. If transactions are not supported, or they are but this transaction is nested and nested transactions are not supported, throw an UnsupportedOperationException.

abort

void abort()

If transactions are supported and there is a transaction in progress, abort it. If transactions are not supported, or there is no transaction in progress, throw an UnsupportedOperationException.

commit

void commit()

If transactions are supported and there is a transaction in progress, commit it. If transactions are not supported, , or there is no transaction in progress, throw an UnsupportedOperationException.

executeInTransaction

Object executeInTransaction(Command c)

Deprecated. use execute(Runnable) or calculate(Supplier)

If transactions are supported, execute the command c within a transaction and return its result. If not, throw an UnsupportedOperationException.

execute

void execute(Runnable action)

Execute the runnable action within a transaction. If it completes normally, commit the transaction, otherwise abort the transaction.

calculate

<T> T calculate(Supplier<T> action)

Execute the supplier action within a transaction. If it completes normally, commit the transaction and return the result, otherwise abort the transaction.