[jboss-jira] [JBoss JIRA] (JGRP-1816) Message: add flag DONT_LOOPBACK

[Bela Ban (JIRA)]

Bela Ban created JGRP-1816:
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             Summary: Message: add flag DONT_LOOPBACK
                 Key: JGRP-1816
                 URL: https://issues.jboss.org/browse/JGRP-1816
             Project: JGroups
          Issue Type: Feature Request
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.5


When flag {{DONT_LOOPBACK}}, then multicast messages ({{dest}} == null) are not looped back up the stack. This can be useful in some cases, e.g. discovery:
* A multicasts a discovery request
* A gets the discovery request and adds information shipped with it (A's logical-physical address mapping and logical name) to its local cache(s)
* A sends a discovery response to itself
* A gets the discovery response and adds its information *again*
--> Because the information was already present, it doesn't need to be added, *but was added 2 more times* !
--> This unneeded processing costs threads from the pool, processing power, locks etc
SOLUTION:
* When sending a multicast message we loop it back up and then multicast  it. When received by the sender, we drop it.
* We now don't even loop back the message if DONT_LOOPBACK is set

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