Make DoubleEventSelectorAthenaPool more flexible
This is an alternative to !24443 (closed). As @gemmeren suggested we can make DoubleEventSelectorAthenaPool
more flexible by inheriting EventSelectorAthenaPool
and adding the secondary event selector as a property so can be interchanged. This will also allow EventSelectorByteStream
to be used as secondary one.
Edited by Tadej Novak