[jboss-jira] [JBoss JIRA] (JGRP-1951) Flexible buffers for scatter/gather

[Bela Ban (JIRA)]

Bela Ban created JGRP-1951:
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             Summary: Flexible buffers for scatter/gather
                 Key: JGRP-1951
                 URL: https://issues.jboss.org/browse/JGRP-1951
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.6.5


Currently, {{Buffers}} and {{WriteBuffers}} are inflexible in that they always expect a length buffer followed by data ({{Buffers}}), or a sequence of len/data pairs ({{WriteBuffers}}).
This is bad if we for example want to read a sequence like the one below (for connection establishment in TCP):
{noformat}
| cookie | version | len | peer-address |
     (4)          (2)      (2)          (variable)
{noformat}

Goals:
* Have only 1 buffer, for reading *and* writing
* Allow to define the sequence by adding buffers dynamically, e.g. in the above case, we'd add a 4 and a 2-length buffer and read data into them. If the cookie and version don't match, throw an exception, else *dynamically* add a length buffer (posibly doing a clear() which removes the first 2 buffers), read data into it, then add a new buffer sized to the read length and finally read data into it.




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