org.codeartisans.java.sos.messagebus.SingleThreadDeliveryMixin Maven / Gradle / Ivy
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/*
* Copyright (c) 2009, Paul Merlin. All Rights Reserved.
* Copyright (c) 2010, Fabien Barbero. All Rights Reserved.
*
* 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.codeartisans.java.sos.messagebus;
import org.codeartisans.java.sos.SOSFailure;
import org.codeartisans.java.sos.threading.WorkQueueComposite;
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.UnitOfWorkCompletionException;
import org.qi4j.api.unitofwork.UnitOfWorkFactory;
/**
* MessageBus Mixin that use a thread to deliver Messages to Subscribers sequentially.
* The publish method returns immediatly.
*/
public abstract class SingleThreadDeliveryMixin
extends BaseMessageBus
implements MessageBusComposite
{
@Structure
private UnitOfWorkFactory uowf;
@Service
private WorkQueueComposite workQueue;
@Override
public void publish( final Message message )
{
workQueue.enqueue( new Runnable()
{
@Override
public void run()
{
if ( !vetoed( message ) ) {
final UnitOfWork uow = uowf.newUnitOfWork();
for ( S eachSubscriber : subscribers( message.getMessageType() ) ) {
try {
message.deliver( eachSubscriber );
uow.complete();
} catch ( UnitOfWorkCompletionException ex ) {
uow.discard();
throw new SOSFailure( "Error during message delivery", ex );
}
}
}
}
} );
}
}