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

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