public ProjectionEvent Get(Projection projection)
{
Guard.AgainstNull(projection, nameof(projection));
var projectionAggregation = _eventProcessor.GetProjectionAggregation(projection.AggregationId);
Guard.AgainstNull(projectionAggregation, nameof(projectionAggregation));
if (!projectionAggregation.ContainsProjection(projection.Name))
{
throw new InvalidOperationException(string.Format(Resources.ProjectionNotInAggregationException, projection.Name, projectionAggregation.Id));
}
lock (projectionAggregation)
{
var sequenceNumber = projection.SequenceNumber + 1;
if (!projectionAggregation.ContainsPrimitiveEvent(sequenceNumber))
{
foreach (var primitiveEvent in _repository.Get(sequenceNumber, sequenceNumber + _configuration.ProjectionEventFetchCount,
projectionAggregation.EventTypes))
{
projectionAggregation.AddPrimitiveEvent(primitiveEvent);
if (primitiveEvent.SequenceNumber > _sequenceNumberHead)
{
_sequenceNumberHead = primitiveEvent.SequenceNumber;
}
}
}
var result = projectionAggregation.GetNextPrimitiveEvent(projection.SequenceNumber);
return(result == null
? new ProjectionEvent(_sequenceNumberHead)
: new ProjectionEvent(result));
}
}