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: 3.6.7 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 (possibly 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.