[jboss-jira] [JBoss JIRA] (JGRP-1937) Configuration: revert order of protocols in configuration

[Bela Ban (JIRA)]

Bela Ban created JGRP-1937:
------------------------------

             Summary: Configuration: revert order of protocols in configuration
                 Key: JGRP-1937
                 URL: https://issues.jboss.org/browse/JGRP-1937
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 4.0


Currently, a JGroups configuration lists the protocols in *bottom to top* order, e.g.
{noformat}
<UDP/>
<PING/>
...
<FRAG2/>
{noformat}

This is somewhat misleading as {{UDP}} is not the top protocol in the resulting stack, but the bottom protocol stack:
{noformat}
FRAG2
   |
PING
   |
  ...
 UDP
{noformat}

Therefore, it would be better to define the configuration as follows:
{noformat}
<FRAG2/>
...
<PING/>
<UDP/>
{noformat}

To prevent reuse of older configurations in 4.0, we could replace {{<config>}} with {{<jgroups>}}.
A configuration starting with {{<config>}} would be parsed in the old style (plus a warning would be issued) and a config starting with {{<jgroups>}} would be parsed in the new style.
If programmatic configuration is used, we could check which protocol is at the head of the list. If it is a transport protocol ({{UDP}} or {{TCP}}), we could dynamically revert the order and issue a warning.



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