Re: [ws-rx] MessagePending

[Anish Karmarkar <Anish.Karmarkar@oracle.com>]

Paul Fremantle wrote:
> Rereading the spec around MakeConnection, I realize that we defined 
> MessagePending as only applicable on a message flowing back on a 
> MakeConnection backchannel. It seems to me that we could usefully add 
> this message in cases where a response is flowing on a back channel.
> 
> For example. Suppose I have an interaction
> 
> 1. GET1 ----->
> <---- RESPONSE1
> 
> 2. GET2----->
> (response lost)
> 
> 3. GET3----->
> <------RESPONSE3
> 
> In 3, the Get will have an ack for response1, and the server can 
> indicate that response 2 is missing.
> 

When the RMD (client) gets RESPONSE3, given that the messages have 
sequence number, won't the RMD automatically know that there is a 
pending RESSPONSE2 which it hasn't received yet?

-Anish
--

> We already have logic to decide when piggybacking of acks is 
> appropriate. I believe the logic could be extended to decide when it was 
> ok to send back a MessagePending header:
> 
> * In the sequenceID case, it would be appropriate whenever the message 
> being sent back was part of the same Offered response sequence.
> * In the URI case, it would be appropriate whenever the replyTo URI 
> matched the MessagePending URI.
> 
> Paul