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From "Karthik Kambatla (Created) (JIRA)" <>
Subject [jira] [Created] (S4-37) Emitters should allow registering a callback
Date Fri, 23 Dec 2011 20:00:32 GMT
Emitters should allow registering a callback

                 Key: S4-37
             Project: Apache S4
          Issue Type: New Feature
    Affects Versions: 0.5
            Reporter: Karthik Kambatla
            Assignee: Karthik Kambatla
             Fix For: 0.5

In the current state, emitters (udp, tcp, and others) send the messages across. They do not
necessarily acknowledge the information regarding the send (success/failure) to the calling

An ACK from the emitter is important to realize more complicated emitter/listener protocols.
For instance, to implement a ReplicationEmitter (the message is sent to multiple nodes instead
of one node, say for fault-tolerance), the message should be processed only after it is replicated
the required number of times. So, if we are using TCP as the underlying layer, it should callback
when the operation succeeds.

I am eager to hear comments on (1) should we provision for complicated protocols? (2) if so,
is there any better way of going about things?

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