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package org.impalaframework.extension.event;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.transaction.support.TransactionSynchronizationAdapter;
import org.springframework.transaction.support.TransactionSynchronizationManager;

/**
 * Extension of {@link AsynchronousEventService} which is transaction aware.
 * @author Phil Zoio
 */
public class TransactionalAsynchronousEventService extends AsynchronousEventService {
    
    private static final Log logger = LogFactory.getLog(TransactionalAsynchronousEventService.class);
    
    //FIXME write unit tests for this.
    
    @Override
    protected void doSubmitEvent(Event event) {
        if (!TransactionSynchronizationManager.isSynchronizationActive()) {
            addEventToQueue(event);
        } else {
            TransactionSynchronizationManager.registerSynchronization(new EventTransactionSynchronization(event));
        }
    }
    
    class EventTransactionSynchronization extends TransactionSynchronizationAdapter {
        
        private Event event;

        public EventTransactionSynchronization(Event event) {
            super();
            this.event = event;
        }

        @Override
        public void afterCommit() {
            if (logger.isDebugEnabled()) {
                logger.debug("Transaction committed: adding event to queue: " + event);
            }
            TransactionalAsynchronousEventService.this.addEventToQueue(event);
        }
        
        @Override
        public void afterCompletion(int status) {           
            if (logger.isDebugEnabled()) {
                logger.debug("Transaction event synchronization completed with status: " + status);
            }
        }
    }

}