For APNs the following code fire up a APNs connection per 1000 tokens:
https://github.com/lfryc/aerogear-unifiedpush-server/blob/jms-batching/push/sender/src/main/java/org/jboss/aerogear/unifiedpush/message/Sender.java#L40-L41
This is a problem. We should not do that.
Improvements:
before firing the above selection, open the APNs connection, and reuse per 1000 tokens
on the last selection, we should close the APNs connection.
So in between we reuse the connection.
For APNs. I think we should also increase the size of allowed tokens to 10k.