/**
*
* 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.domain.factory;
import java.io.IOException;
import org.qi4j.api.Qi4j;
import org.qi4j.api.concern.ConcernOf;
import org.qi4j.api.entity.EntityComposite;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.structure.Application;
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.api.value.ValueBuilder;
import org.qi4j.api.value.ValueBuilderFactory;
import org.qi4j.functional.Iterables;
import org.qi4j.io.Inputs;
import org.qi4j.io.Output;
import org.qi4j.library.eventsourcing.domain.api.DomainEventValue;
import org.qi4j.library.eventsourcing.domain.api.UnitOfWorkDomainEventsValue;
import org.qi4j.library.eventsourcing.domain.source.EventStore;
import org.qi4j.library.eventsourcing.domain.source.UnitOfWorkEventsVisitor;
import org.qi4j.library.eventsourcing.domain.spi.CurrentUser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Notify event listeners when a complete UoW of domain events is available.
*/
public class UnitOfWorkNotificationConcern
extends ConcernOf<DomainEventFactory>
implements DomainEventFactory
{
@Service
EventStore eventStore;
@Service
Iterable<UnitOfWorkEventsVisitor> transactionVisitors;
@Service
CurrentUser currentUser;
@Structure
ValueBuilderFactory vbf;
@Structure
UnitOfWorkFactory uowf;
@Structure
Qi4j api;
String version;
Logger logger = LoggerFactory.getLogger( DomainEventFactory.class );
Output<UnitOfWorkDomainEventsValue, IOException> eventOutput;
public void init( @Structure Application application )
{
version = application.version();
eventOutput = eventStore.storeEvents();
}
@Override
public DomainEventValue createEvent( EntityComposite entity, String name, Object[] args )
{
final UnitOfWork unitOfWork = uowf.currentUnitOfWork();
DomainEventValue eventValue = next.createEvent( api.dereference( entity ), name, args );
// Add eventValue to list in UoW
UnitOfWorkEvents events = unitOfWork.metaInfo(UnitOfWorkEvents.class );
if (events == null)
{
events = new UnitOfWorkEvents();
unitOfWork.setMetaInfo( events );
unitOfWork.addUnitOfWorkCallback( new UnitOfWorkCallback()
{
String user;
@Override
public void beforeCompletion() throws UnitOfWorkCompletionException
{
user = currentUser.getCurrentUser();
}
@Override
public void afterCompletion( UnitOfWorkStatus status )
{
if (status.equals( UnitOfWorkStatus.COMPLETED ))
{
UnitOfWorkEvents events = unitOfWork.metaInfo( UnitOfWorkEvents.class );
ValueBuilder<UnitOfWorkDomainEventsValue> builder = vbf.newValueBuilder( UnitOfWorkDomainEventsValue.class );
builder.prototype().user().set( user );
builder.prototype().timestamp().set( System.currentTimeMillis() );
builder.prototype().usecase().set( unitOfWork.usecase().name() );
builder.prototype().version().set( version );
builder.prototype().events().get().addAll( events.getEventValues() );
try
{
final UnitOfWorkDomainEventsValue unitOfWorkDomainValue = builder.newInstance();
Inputs.iterable( Iterables.iterable( unitOfWorkDomainValue ) ).transferTo( eventOutput );
for (UnitOfWorkEventsVisitor unitOfWorkEventsVisitor : transactionVisitors)
{
try
{
unitOfWorkEventsVisitor.visit( unitOfWorkDomainValue );
} catch (Exception e)
{
logger.warn( "Could not deliver events", e );
}
}
} catch (IOException e)
{
logger.error( "Could not store events", e );
// How do we handle this? This is a major error!
}
}
}
} );
}
events.add( eventValue );
return eventValue;
}
}