[undertow-dev] Async sending of NIO objects thru a ServletOutputStream?

Hi guys, I'm looking to promote Undertow as a preferred alternative to Jetty for the Pedestal [1] framework. One Jetty feature it relies on is the async sending of ByteBuffers and ReadableByteChannels in Jetty's impl of ServletOutputStream [2]. Two methods, in particular: sendContent(ByteBuffer, Callback) and sendContent(ReadableByteChannel, Callback). I was hoping someone might point me in the right direction of replicating this behavior with Undertow's ServletOutputStreamImpl. It does have a write(ByteBuffer) method, but it appears to be blocking. And I was hoping there might be some XNIO abstraction for dealing with the ReadableByteChannel, perhaps some example code somewhere? Any and all help/advice is appreciated! Jim [1]: https://github.com/pedestal/pedestal [2]: http://grepcode.com/file/repo1.maven.org/maven2/org.eclipse.jetty/jetty-s...