/*
* Copyright 2009-2010 Rickard Öberg AB
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.qi4j.library.eventsourcing.application.factory;
import java.io.IOException;
import org.qi4j.api.concern.ConcernOf;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.unitofwork.UnitOfWork;
import org.qi4j.api.unitofwork.UnitOfWorkCallback;
import org.qi4j.api.unitofwork.UnitOfWorkCompletionException;
import org.qi4j.api.unitofwork.UnitOfWorkFactory;
import org.qi4j.library.eventsourcing.application.api.ApplicationEvent;
import org.qi4j.library.eventsourcing.application.source.ApplicationEventStore;
import org.qi4j.library.eventsourcing.domain.factory.DomainEventFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Notify transaction listeners when a complete transaction of domain events is available.
*/
public class TransactionNotificationConcern
extends ConcernOf<ApplicationEventFactory>
implements ApplicationEventFactory
{
@Service
ApplicationEventStore eventStore;
@Structure
UnitOfWorkFactory uowf;
Logger logger = LoggerFactory.getLogger( DomainEventFactory.class );
@Override
public ApplicationEvent createEvent( String name, Object[] args )
{
final UnitOfWork unitOfWork = uowf.currentUnitOfWork();
ApplicationEvent event = next.createEvent( name, args );
// Add event to list in UoW
UnitOfWorkApplicationEvents events = unitOfWork.metaInfo( UnitOfWorkApplicationEvents.class );
if( events == null )
{
events = new UnitOfWorkApplicationEvents();
unitOfWork.setMetaInfo( events );
unitOfWork.addUnitOfWorkCallback( new UnitOfWorkCallback()
{
@Override
public void beforeCompletion()
throws UnitOfWorkCompletionException
{
}
@Override
public void afterCompletion( UnitOfWorkStatus status )
{
if( status.equals( UnitOfWorkStatus.COMPLETED ) )
{
UnitOfWorkApplicationEvents events = unitOfWork.metaInfo( UnitOfWorkApplicationEvents.class );
try
{
eventStore.storeEvents( events.getEvents() );
}
catch( IOException e )
{
logger.error( "Could not store events", e );
// How do we handle this? This is a major error!
}
}
}
} );
}
events.add( event );
return event;
}
}