[jboss-jira] [JBoss JIRA] (JGRP-1765) TP: enable loopback by default and discard own multicasts

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12951495#comment-12951495 ] 

Bela Ban commented on JGRP-1765:
--------------------------------

To avoid having to deserialize a message or message batch sent by self, only to discard it later, the sender's address should be read first. (We cannot use the sender's physical address, as a multicast to local:7500 would not reveal the sender's local port).

E.g if P multicasts 100 messages, the current algorithm works as follows:
* The byte buffer representing the 100 messages is received
* We parse the messages and create one or more batches
* All batches sent from P are discarded (if loopback is true)
--> The deserialization and creation of memory to hold the batch was not needed as it was discarded anyway
                
> TP: enable loopback by default and discard own multicasts
> ---------------------------------------------------------
>
>                 Key: JGRP-1765
>                 URL: https://issues.jboss.org/browse/JGRP-1765
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>
> Enable {{TP.looback}} by default (deprecate and ignore prop): all messages sent by self are passed right to a thread pool to send them up again.
> When a multicast message sent by self is received, it is currently passed to a thread pool, de-serialized and only then discarded if loopback=true. This means that we create an unneeded buffer for de-serializationand perform de-serialization.
> SOLUTION: discard the multicast from self immediately when receiving it, in {{TP.receive()}}

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