[jboss-jira] [JBoss JIRA] (JGRP-2418) Impedence mismatch between message types and transports

[Bela Ban (Jira)]

Bela Ban created JGRP-2418:
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             Summary: Impedence mismatch between message types and transports
                 Key: JGRP-2418
                 URL: https://issues.jboss.org/browse/JGRP-2418
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 5.1


When sending a message (_of any type_), it is currently marshalled into a byte[] array, which is handled diffently by each transport:
* UDP wraps it into a DatagramPacket and calls DatagramSocket.send()
* TCP writes the array to the socket's output stream
* TCP_NIO2 wraps it into a {{ByteBuffer}} and calls SocketChannel.write(ByteBuffer)

In some cases, there is an impedance mismatch between the type of the message and the type of the transport: for example, when sending an NioMessage (containing a ByteBuffer), we don't actually need the conversion to byte array and the subsequent wrapping into a ByteBuffer, this is superfluous. Even worse, when using off-heap, this creates unneeded memory allocation. Passing the *same* ByteBuffer all the way down from the application to the transport would be beneficial.

This requires changes in the way bundlers accumulate messages. Also, perhaps the transport itself should become an SPI, to which a generic {{Transport}} protocol delegates. This would also allow up to implement multiple transports in the same stack.



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