[jboss-jira] [JBoss JIRA] (JGRP-1989) Bundlers: reuse send buffer when transport == sync.

[Bela Ban (JIRA)]

Bela Ban created JGRP-1989:
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             Summary: Bundlers: reuse send buffer when transport == sync.
                 Key: JGRP-1989
                 URL: https://issues.jboss.org/browse/JGRP-1989
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.6.7


With the addition of {{TCP_NIO2}}, all bundlers now create new send buffers for every message (or message list). This generates a lot of memory allocations, perhaps it is better to revert this change for *synchronous transports* such as {{UDP}} and {{TCP}}, and still create new buffers for *asynchronous transports* such as {{TCP_NIO2}}.
Synchronous transports guarantee a message has been put on the wire when {{TP.send()}} returns, whereas asynchronous transports may only have completed a partial write (so we cannot reuse the buffer).
The code in the bundler should check for this, and copy if async or not copy if sync.
Whether or not a transport is sync is determined by a new abstract method that needs to be overridden by every transport.



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