TransactionHandler (Apache Jena)

All Known Implementing Classes:

BaseInfGraph.InfTransactionHandler, SimpleTransactionHandler, TransactionHandlerBase
```
public interface TransactionHandler
```
Preliminary interface for graphs supporting transactions.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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(java.util.function.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(java.lang.Runnable action)`	Execute the runnable `action` within a transaction.
`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.
  - execute
```
void execute(java.lang.Runnable action)
```
    Execute the runnable action within a transaction. If it completes normally, commit the transaction, otherwise abort the transaction.
  - calculate
```
<T> T calculate(java.util.function.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.