There are a couple of changes here all related to making the SCTP
transport less garbage-heavy:
- Remove the SctpNotificationEvent and just passes along the JDK NIO
Notification, as passing the Notification and always null inside a
wrapped object seemed a little bit superfluous
- Apply @trustin's changes to receive buffer allocation to SCTP
transport, and also makes the SCTP transport use the configured buffer
allocator rather than always creating a direct buffer (which seems
like a bug)
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