We've added a TransactionRequestCycleListener (extends
AbstractRequestCycleListener). This class handles transactions mainly like
this:
@Override
public void onRequestHandlerResolved(final RequestCycle cycle, final
IRequestHandler handler)
{
LOGGER.debug( "start transaction ---" +
cycle.getRequest().getUrl().toString() + "---" );
Main.model.startTransaction(applicationName);
}
@Override
public void onRequestHandlerExecuted(final RequestCycle cycle, final
IRequestHandler handler)
{
if(handler instanceof FooExceptionRequestHandler)
{
LOGGER.warn( "rollback transaction ---" +
cycle.getRequest().getUrl().toString() + "---" );
Main.model.rollbackIfNotCommitted();
}
else
{
if( Main.model.hasCurrentTransaction() )
{
LOGGER.debug( "commit transaction ---" +
cycle.getRequest().getUrl().toString() + "---" );
Main.model.commit();
}
else
{
LOGGER.debug( "no transaction to commit ---" +
cycle.getRequest().getUrl().toString() + "---" );
}
}
}
The Model#currentTransaction() just returns the current transaction for this
thread and looks like:
/**
* Returns the transaction for this model,
* that is bound to the currently running thread.
* @throws IllegalStateException if there is no cope transaction bound to
current thread
* @see Thread#currentThread()
*/
public Transaction currentTransaction()
{
final Transaction result = transactions.currentIfBound();
if(result==null)
throw new IllegalStateException("there is no transaction bound
to this
thread, see Model#startTransaction");
return result;
}
We use our own persistence framework to handle transactions to the
underlying database. No magic all about.
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