if( everyElement.isBuffer() )
rhsDuct = new BufferEveryWindow( flowProcess, everyElement );
else if( everyElement.isAggregator() )
rhsDuct = new AggregatorEveryStage( flowProcess, everyElement );
else if( everyElement.isGroupAssertion() )
rhsDuct = new GroupAssertionEveryStage( flowProcess, everyElement );
else
throw new IllegalStateException( "unknown operation: " + everyElement.getOperation().getClass().getCanonicalName() );
}
else if( element instanceof Boundary )
{